Разделы схем — 31 (всего 80)
AIR CONDITIONING ANTI-LOCK BRAKES ANTI-THEFT BODY CONTROL MODULES COMPUTER DATA LINES COOLING FAN CRUISE CONTROL DEFOGGERS ELECTRONIC POWER STEERING ENGINE PERFORMANCE EXTERIOR LIGHTS GROUND DISTRIBUTION HEADLIGHTS HORN INSTRUMENT CLUSTER INTERIOR LIGHTS NAVIGATION POWER DISTRIBUTION POWER DOOR LOCKS POWER MIRRORS POWER SEATS POWER TOP/SUNROOF POWER WINDOWS RADIO SHIFT INTERLOCK STARTING/CHARGING SUPPLEMENTAL RESTRAINTS TRANSMISSION TRUNK, TAILGATE, FUEL DOOR WARNING SYSTEMS WIPER/WASHER
AIR CONDITIONING
3.8L VIN 2 3.8L VIN 2, Automatic A/C Wiring Diagram (1 of 2) for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Automatic A/C Wiring Diagram (1 of 2) for Buick LaCrosse CX 2009: 76 (left rear of engine) g115 (part of a/c compressor) a/c compressor clutch (right front of engine compt) g100 (w/ california pzev emission system) j114 A/c clu diode A/c clutch fuse 13 10a A/c comp relay A/c request ind A10 A11 A12 A18 A19 Air temp a Air temp b Auto Battery Blower motor sw C18 C19 Class 2 serial Computer data lines system Defogger E10 Fan 1 fuse 29 30a Fan 1 relay Fan 2 fuse 32 30a Fan 2 relay Fan 3 relay G200 (left side of dash) G202 (left side of dash) Ground High Hot at all times Hot w/ ign 1 relay energized Hvac control module (center of dash) Ign 1 volt Illum Ind Interior lights system J211 J213 K14 K15 K18 K19 L14 Left air temperature actuator (left side of dash, on hvac module) Logic Low Low ref Lower left air temperature sensor (behind hvac control module) Lower right air temperature sensor (behind hvac control module) M14 M15 M18 M19 Mode actuator (lower left side of hvac assembly) Mode door a Mode switch Off Pnk Position sig Rear defogger switch Recirc a Recirc b Recirculation Recirculation actuator (right side of hvac assembly) Recirculation switch Request switch a/c Right air temperature actuator (right side of hvac module) Sensor sig Speed ctrl Tan Temperature control sw Underhood fuse block (right front strut tower) 3.8L VIN 2, Automatic A/C Wiring Diagram (2 of 2) for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Automatic A/C Wiring Diagram (2 of 2) for Buick LaCrosse CX 2009: 37 5v reference 2 A/c comp clutch A/c press signal A/c refrigerant pressure sensor (on left side of engine compt) Batt main 4 fuse 30 30a Battery Blower motor (behind right side of dash, in hvac module) Blower motor control processor (right side of dash) Class 2 serial Computer data lines system D11 Display fuse 18 10a Ect sens sig Engine coolant temperature (ect) sensor (top of engine) G200 (left side of dash) G202 (left side of dash) Gnd Hot at all times Hot w/ ign 1 relay energized Hvac fuse 10a I/p fuse block (right side of dash) Ign 1 volt Inside air temperature sensor (left side of dash) J211 Left cooling fan (behind left side of radiator) Low ref Pnk Powertrain control module (pcm) Red Relay ctrl Right cooling fan (behind right side of radiator) Speed ctrl Sunload sensor assembly (center of dash) Tan Underhood fuse block (right front strut tower) Upper left air temperature sensor (center of dash) Upper right air temperature sensor (center of dash) 3.8L VIN 2, Compressor Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Compressor Wiring Diagram for Buick LaCrosse CX 2009: 31 (part of a/c compressor) a/c compressor clutch (w/ california pzev emission system) j114 5v reference A/c clu diode A/c clutch fuse 13 10a A/c comp clutch A/c comp relay A/c press signal A/c refrigerant pressure sensor (on left side of engine compt) A/c request ind A/c request switch Battery Class 2 serial Computer data lines system Display fuse 18 10a G115 (left rear of engine) G202 (left side of dash) Ground Hot at all times Hot in run or start Hot w/ ign 1 relay energized Hvac control module (center of dash) Hvac fuse 10a I/p fuse block (right side of dash) Ignition 1 J211 Logic Low ref Pnk Powertrain control module (pcm) Underhood fuse block (right front strut tower)
5.3L VIN C 5.3L VIN C, Automatic A/C Wiring Diagram (1 of 2) for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Automatic A/C Wiring Diagram (1 of 2) for Buick LaCrosse CX 2009: 63 (part of a/c compressor) a/c compressor clutch (right front of engine compt) g100 87a A/c cmprsr fuse 10a A/c cmprsr relay A/c request ind A10 A11 A12 Air temp a Air temp b Auto Battery Blower motor sw Class 2 serial Computer data lines system Defogger Emission 2 fuse 15a Fan 1 fuse 30a Fan 1 relay Fan 2 fuse 30a Fan 2 relay Fan 3 relay G112 (left rear of engine) G200 (left side of dash) G202 (left side of dash) Ground High Hot at all times Hot w/ pwr/trn relay energized Hvac control module (center of dash) Ign 1 volt Illum Ind Interior lights system J123 J211 J213 Left air temperature actuator (left side of hvac module) Logic Low Low ref Lower left air temperature sensor (behind hvac control module) Lower right air temperature sensor (behind hvac control module) Mode actuator (lower left side of hvac assembly) Mode door a Mode switch Off Pnk Position sig Rear defogger switch Recirc a Recirc b Recirculation Recirculation actuator (right side of hvac module) Recirculation switch Request switch a/c Right air temperature actuator (right side of hvac module) Sensor sig Speed ctrl Tan Temperature control sw Underhood fuse block (right front strut tower) 5.3L VIN C, Automatic A/C Wiring Diagram (2 of 2) for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Automatic A/C Wiring Diagram (2 of 2) for Buick LaCrosse CX 2009: 40 5v reference 2 A/c comp clutch A/c press signal A/c refrigerant pressure sensor (on left side of engine compt) Batt 4 fuse 30a Battery Blower motor (right side of hvac module) Blower motor control processor (right side of dash) Class 2 serial Compass fuse 10a Computer data lines system D11 Ect sens sig Engine control module (ecm) (left front of engine compt) Engine coolant temperature (ect) sensor (left front of engine) G100 (right front of engine compt) G200 (left side of dash) G202 (left side of dash) Gnd Hot at all times Hot in run or start Hvac fuse 10a I/p fuse block (right side of dash) Ign 1 volt Inside air temperature sensor (left side of dash) J123 J211 Left cooling fan (behind left side of radiator) Low ref Pnk Radiator) Red Relay ctrl Right cooling fan (behind right side of b Speed ctrl Sunload sensor assembly (center of dash) Tan Underhood fuse block (right front strut tower) Upper left air temperature sensor (center of dash) Upper right air temperature sensor (center of dash) 5.3L VIN C, Compressor Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Compressor Wiring Diagram for Buick LaCrosse CX 2009: 29 (part of a/c compressor) a/c compressor clutch 5v reference A/c cmprsr fuse 10a A/c cmprsr relay A/c comp clutch A/c press signal A/c refrigerant pressure sensor (on left side of engine compt) A/c request ind A/c request switch Battery Class 2 serial Computer data lines system Emission 2 fuse 15a Engine control module (ecm) (left front of engine compt) G112 (left rear of engine) G202 (left side of dash) Ground Hot at all times Hot in run or start Hot w/ pwr/ trn relay energized Hvac control module (center of dash) Hvac fuse 10a I/p fuse block (right side of dash) Ignition 1 J211 Logic Low ref Pnk Underhood fuse block (right front strut tower)
ANTI-LOCK BRAKES Anti-lock Brakes Wiring Diagram (1 of 2) for Buick LaCrosse CX 2009 List of elements for Anti-lock Brakes Wiring Diagram (1 of 2) for Buick LaCrosse CX 2009: 55 (5.3l) j125 (5.3l: left side of engine) (3.8l: left rear of engine) (i/p wiring harness, 14 cm from pass- through to brake fluid level switch) (off-engine wiring harness, 6 cm from breakout to brake fluid pressure sensor) (right front wheel hub assembly) (w/ active brake control) right front wheel speed sensor (wss) (right rear wheel hub assembly) (w/ active brake control) right rear wheel speed sensor (wss) 5-volt ref 5.3l A11 Abs fuse 10a Abs fuse 23 10a Abs mtr fuse 31 40a Abs mtr fuse 40a Abs sol fuse 19 25a Abs sol fuse 25a Actuator ctrl Batt pos Batt pos volt Brake fluid pressure sensor (w/ active brake control) Brake pressure modulator valve (bpmv) Class 2 serial data Computer data lines system Delivered torque sig Electronic brake control module (ebcm) (integral to brake pressure modulator valve) Engine spd sig Engine spd sig hi spd serial data (-) Except 5.3l G115 Ground Hi spd serial data (+) Hi spd serial data (-) Hot at all times Hot w/ ign 1 relay energized Hot w/ ignition main pcb relay energized Ign volt J107 J216 Lateral accelerometer sig Left front wheel speed sensor (wss) (w/ active brake control) (left front wheel hub assembly) Left rear wheel speed sensor (wss) (w/ active brake control) (left rear wheel hub assembly) Low ref Nca Pnk Red Requested torque sig Sens sig Steering angle sensor (w/ active brake control) (base of steering column) Stop lamp sw sig Tan Underhood fuse block (right front strut tower) Variable effort steering actuator W/ active brake control W/o active brake control Yaw rate sens sig Yaw rate sens test ctrl Anti-lock Brakes Wiring Diagram (2 of 2) for Buick LaCrosse CX 2009 List of elements for Anti-lock Brakes Wiring Diagram (2 of 2) for Buick LaCrosse CX 2009: 44 10-volt ref 3.8l 5-volt ref 5.3l Abs ind Batt pos volt Body control module (bcm) (left side of dash) Brake pedal position (bpp) sensor (left side of dash) Class 2 serial data Clstr fuse 10a Computer data lines system Delivered torque sig Driver information center (dic) display Driver information center (dic) switch Ecm class 2 serial data Engine control module (ecm) (left front of engine compt) Engine spd sig Except 3.8l Except 5.3l G202 (left side of dash) Ground Hot at all times I/p fuse block (right side of dash) Ign volt Instrument panel cluster (ipc) Ipc class 2 serial data J211 Lateral accelerometer sig Logic Low ref Pcm class 2 serial data Pnk Powertrain control module (pcm) Requested torque sig Stop lp sw sig Traction control off ind Traction control switch Traction ctrl sw sig Underhood fuse block (right front strut tower) W/ active brake control W/o active brake control Yaw & lateral acceleration sensor (w/ active brake control) (center console) Yaw rate sen sig Yaw rate test cntrl
ANTI-THEFT Forced Entry Wiring Diagram (1 of 2) for Buick LaCrosse CX 2009 List of elements for Forced Entry Wiring Diagram (1 of 2) for Buick LaCrosse CX 2009: 66 (center rear of roof) (if equipped) radio rear window antenna (front of driver's door sill) g301 3.8l 5.3l Ajar sw sig Antenna sig Batt volt (+) Bcm class 2 Body control module (bcm) (left side of dash) C11 C4 x2 Class 2 ser data Coax Computer data lines system Door ajar indicator Dr ajar sw sig Dr open sw sig Driver door lock switch Driver information center (dic) display Front passenger door lock switch G101 (left front of engine compt) G202 (left side of dash) G301 (front of driver's door sill) G302 (front of front passenger's door sill) Ground Headlights system exterior lights system Hi beam relay Hood ajar switch (front of engine compt) Horn rly ctrl Horns system Hot at all times I/p fuse block (right side of dash) Ind ctrl Instrument panel cluster (ipc) Interior lights system J112 J211 J300 J303 J400 (w/ digital audio system) J501 J605 Lamp rly ctrl Lid ajar sw Lock Lock ctrl Lock sig Logic Nca Pnk Power distribution system Remote control door lock receiver (rcdlr) (right side of dash) Rfa ser data Rfa/mod fuse 10a Security indicator Security indicator lamp Sw sig Tan Trunk ajar indicator Trunk fuse 15a Underhood fuse block (right front strut tower) Unlock Unlock ctrl Unlock sig Volt (+) X3 c12 Forced Entry Wiring Diagram (2 of 2) for Buick LaCrosse CX 2009 List of elements for Forced Entry Wiring Diagram (2 of 2) for Buick LaCrosse CX 2009: 23 (body wiring harness, 26 cm from second breakout to g301) j315 (body wiring harness, 29 cm from second breakout to inline connector x311) Ajar Door lock actuator Door lock ajar indicator switch Door lock cylinder switch Door lock open indicator switch Driver door lock (driver's door) Front passenger door lock (front passenger's door) G301 (front of driver's door sill) G302 (front of front passenger's door sill) J303 J314 J406 J500 J604 Left rear door lock (left rear door) Lock Open Rear compartment lid latch (in trunk lid) Right rear door lock (right rear door) Tan Unlock Pass-Key Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Pass-Key Wiring Diagram for Buick LaCrosse CX 2009: 23 (left front of engine compt) engine control module (ecm) 3.8l 5.3l Body control module (bcm) (left side of dash) Class 2 data Class 2 serial data Computer data lines system Dr/lck trunk fuse 15a Driver information center (dic) display G202 (left side of dash) Ground Hot at all times I/p fuse block (right side of dash) Instrument panel cluster (ipc) J214 Lo ref Logic Low ref Powertrain control module (pcm) Security indicator Tan Theft deterrent exciter module (part of ignition key cylinder) Voltage
BODY CONTROL MODULES
COMPUTER DATA LINES Computer Data Lines Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Computer Data Lines Wiring Diagram for Buick LaCrosse CX 2009: 56 (base of steering column) (i/p wiring harness, approximately 4 cm from breakout to remote control door lock receiver) (left side of dash) g202 3.8l 5.3l A11 Abs/tcs class 2 serial data Adg class 2 serial data B10 Bcm class 2 serial data Body control module (bcm) (left side of dash) Class 2 serial data Data bus (+) Data bus (-) Data bus + Data bus - Data link connector (dlc) (left side of dash) Digital radio receiver (left side of trunk) Ecm class 2 serial data Electronic brake control module (ebcm) (integral to brake pressure modulator valve) Engine control module (ecm) (left front of engine compt) G200 (left side of dash) Hot at all times Hvac class 2 serial data Hvac control module (center of dash) I/p fuse block (right side of dash) If equipped Inflatable restraint sensing & diagnostic module (sdm) (under front passenger's seat) Instrument panel cluster (ipc) Ipc class 2 serial data J201 (i/p wiring harness, 4 cm from breakout to rcdlr) J202 J211 J213 Manual a/c automatic a/c Nca Onstar/ aldl fuse 10a Pcm class 2 serial data Pnk Power distribution system Powertrain control module (pcm) Radio Radio class 2 serial data Remote control door lock receiver (rcdlr) (right side of dash) Rfa class 2 serial data Sdm class 2 serial data Splice pack jx205 (clipped to knee bolster panel, right of data link connector) Steering angle sensor (w/ active brake control) Tan Terminator resistor Throttle actuator control (tac) module (3.8l) (at throttle body) Transmission control module (tcm) (left front of engine compt) Uart serial data primary Uart serial data secondary Vehicle communication interface module (vcim) (center of dash) W/ onstar
COOLING FAN
3.8L VIN 2 3.8L VIN 2, Cooling Fan Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Cooling Fan Wiring Diagram for Buick LaCrosse CX 2009: 32 (right front of engine compt) g100 A18 A19 C18 C19 Class 2 serial Computer data lines system E10 Ect sens sig Engine coolant temperature (ect) sensor (top of engine) Fan 1 fuse 29 30a Fan 1 relay Fan 2 fuse 32 30a Fan 2 relay Fan 3 relay Hi spd fan rly Hot at all times K14 K15 K18 K19 L14 Left cooling fan (behind left side of radiator) Lo spd fan rly Low ref M14 M15 M18 M19 Powertrain control module (pcm) Right cooling fan (behind right side of radiator) Underhood fuse block (right front strut tower)
5.3L VIN C 5.3L VIN C, Cooling Fan Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Cooling Fan Wiring Diagram for Buick LaCrosse CX 2009: 20 87a Class 2 serial Computer data lines system Ect sens sig Engine control module (ecm) (left front of engine compt) Engine coolant temperature (ect) sensor (left front of engine) Fan 1 fuse 30a Fan 1 relay Fan 2 fuse 30a Fan 2 relay Fan 3 relay G100 (right front of engine compt) Hi spd fan rly Hot at all times J123 Left cooling fan (behind left side of radiator) Lo spd fan rly Low ref Right cooling fan (behind right side of radiator) Underhood fuse block (right front strut tower)
CRUISE CONTROL
3.8L VIN 2 3.8L VIN 2, Cruise Control Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Cruise Control Wiring Diagram for Buick LaCrosse CX 2009: 63 (center of dash) g201 (steering column wiring harness) j215 10 volt ref 5 volt ref Accelerator pedal position (app) sensor (left side of dash) App sens 1 sig App sens 2 sig B11 Bat pos vol Bcm class 2 data Body control module (bcm) (left side of dash) Brake pedal position sensor (left side of dash) C11 Clstr fuse 10a Computer data lines system Cruise ctrl sw sig Cruise fuse 2a Cruise indicator Cruise switch D pnk Driver information center (dic) display E10 E12 Etc fuse 15a F11 G113 (lower left rear of engine, near starter) Gnd Ground distribution system Hot at all times Hot in run or start Hot w/ p/train relay energized I/p fuse block (right side of dash) Ign Ign volt Inflatable restraint steering wheel module coil (in steering column) Instrument panel cluster (ipc) Ipc class 2 ser data J102 Left steering wheel control switch Logic Low ref Object alarm module On ind Pnk Powertrain control module Res + Serial data primary Serial data secondary Set - Set/coast resume/ accelerate signal Stop lamp sig Stop lamp sw sig Stop switch sig Tan Throttle actuator control (tac) module (at throttle body) Underhood fuse block (right front strut tower) Veh spd sig Vehicle speed sensor (vss) assembly (right side of transmission) Vehicle speed signal Vss high signal Vss low signal X275 X277
5.3L VIN C 5.3L VIN C, Cruise Control Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Cruise Control Wiring Diagram for Buick LaCrosse CX 2009: 63 (center of dash) g201 (integral to brake pressure modulator valve) electronic brake control module (ebcm) (steering column wiring harness) j215 10 volt ref 5 volt ref 1 5 volt ref 2 5v ref 2 Accelerator pedal position (app) sensor (left side of dash) App sensor 1 sig App sensor 2 sig Bat pos vol Bcm class 2 data Body control module (bcm) (left side of dash) Brake pedal position sensor (left side of dash) Clstr fuse 10a Computer data lines system Cruise ctrl sw sig Cruise fuse 2a Cruise indicator Cruise on ind Cruise switch D pnk Driver information center (dic) display E10 E12 Ecm class 2 ser data Engine control module (ecm) (left front of engine compt) Gmlan serial bus+ Gmlan serial bus- Ground distribution system Hot at all times Hot in run or start I/p fuse block (right side of dash) Ign Inflatable restraint steering wheel module coil (in steering column) Instrument panel cluster (ipc) Ipc class 2 ser data Left steering wheel control switch Logic Low ref Nca Object alarm module Pnk Res + Set - Stop lamp sig Stop switch sig Tac mtr ctrl 1 Tac mtr ctrl 2 Tan Throttle actuator control (tac) module (top rear of engine) Tp sens 1 sig Tp sens 2 sig Transmission control module (tcm) (left front of engine compt) Underhood fuse block (right front strut tower) Veh spd sig Vehicle speed sensor (vss) assembly (right side of transmission) Vehicle speed signal Vss high sig Vss low sig X275 X277 X4 h2
DEFOGGERS Defoggers Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Defoggers Wiring Diagram for Buick LaCrosse CX 2009: 36 (front of driver's door sill) g301 (front of front passenger's door sill) g302 (if equipped) driver outside rearview mirror (if equipped) passenger outside rearview mirror 3.8l 5.3l Automatic a/c Batt 3 fuse 40a Bcm class 2 serial data x1 Body control module (bcm) (left side of dash) Compass sens rtn Defogger on ind Driver information center (dic) display Electronic compass module (top right side of rear package shelf) F11 Hot at all times Hot at all times batt main 3 fuse 28 40a Htd/mir fuse 10a Hvac class 2 serial data Hvac control module (center of dash) I/p fuse block (right side of dash) Instrument panel cluster (ipc) J500 J604 Jx205 (clipped to knee bolster panel, right of data link connector) Logic Manual a/c R/defog relay Rear defog relay ctrl Rear defog relay ctrl x2 Rear defogger switch Rear window defogger grid Red Red f3 Underhood fuse block (right front strut tower) W/ driver information center display
ELECTRONIC POWER STEERING Electronic Power Steering Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Electronic Power Steering Wiring Diagram for Buick LaCrosse CX 2009: 34 5.3l A9 x1 Abs fuse 10a Abs fuse 23 10a Abs mtr fuse 31 40a Abs mtr fuse 40a Abs sol fuse 19 25a Abs sol fuse 25a C2 x4 Computer data lines system Electronic brake control module (ebcm) (integral to brake pressure modulator valve) Except 5.3l G115 (left rear of engine) G3 x1 Gnd Hot at all times Hot w/ ign 1 relay energized Hot w/ ignition main pcb relay energized Ign 1 volt J216 (i/p wiring harness, 14 cm from pass- through to brake fluid level switch) J3 x4 K1 x1 Pnk Red Serial data + Serial data - Steering angle sensor (base of steering column) Str actr ctrl Str actr vt Str angle Tan Underhood fuse block (right front strut tower) Variable effort steering actuator X2 a11
ENGINE PERFORMANCE
3.8L VIN 2 3.8L VIN 2, Engine Performance Wiring Diagram (1 of 5) for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (1 of 5) for Buick LaCrosse CX 2009: 51 (lower center front of engine oil pan) engine oil level (eol) switch (pins 62-72 not used) (top right of intake manifold) manifold absolute pressure (map) sensor (top right rear of engine) exhaust gas recirculation (egr) valve 5 volt ref 1 Air sol ctrl Cmp sensor Ect sensor sig Egr pos sig Egr sol high Egr sol low Engine coolant temperature (ect) sensor (top of engine) Engine oil pressure (eop) switch Evap purge sol Evaporative emission (evap) canister purge solenoid valve (top rear of engine) Fuel inj 1 Fuel inj 2 Fuel inj 3 Fuel inj 4 Fuel inj 5 Fuel inj 6 Fuel injectors (1: top left of engine) (2: top right of engine) (3: top left center of engine) (4: top right center of engine) (5: top left rear of engine) (6: top right rear of engine) G113 (lower left rear of engine, near starter) Gen field Gen on sig Generator Ground Heated oxygen sensor (ho2s) 1 (right side of engine) Ho2s heater 1 Ho2s sig high Ho2s sig low Ic timing ctrl Ic timing sig J101 J109 Knock sensor (ks) 1 (left front of engine) Knock sensor (ks) 2 (below right exhaust manifold) Knock sensor 1 Knock sensor 2 Low eng speed Low ref Map sensor sig Med eng speed Nca Oil level sw Oil press sig Pnk Powertrain control module (pcm) Red Tan Uart data 3.8L VIN 2, Engine Performance Wiring Diagram (2 of 5) for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (2 of 5) for Buick LaCrosse CX 2009: 43 (engine wiring harness, 20 cm from g115) (front of engine) camshaft position (cmp) sensor (in ignition control module wiring harness, 5.5 cm from inline connector x110) (lower left front of engine) crankshaft position (ckp) sensor (top front of engine) (top left front of engine) ignition coil module (icm) 5 volt ref A11 Accelerator (app) pedal position sensor (left side of dash) App sensor 1 App sensor 2 Body control module (bcm) (left side of dash) C11 Elek ign fuse 24 15a Etc fuse 17 15a Fuel inj fuse 20 15a G112 G113 (lower left front of engine, near starter) G113 (lower left rear of engine, near starter) Ground Hot w/ ign1 relay 37 energized Ign 1 volt Ignition coil J101 J102 J144 J145 Logic Low ref Pnk Primary uart Sec uart Secondary air injection (air) control solenoid valve/pressure sensor bank 2 (pzev) (top of engine) Secondary air injection (air) pump solenoid relay (pzev) (near air cleaner duct) Spark plugs Stop lamp Stop lamp switch signal Tan Throttle actuator control (tac) module (at throttle body) To p/train relay (diagram 4 of 5) Trans sol fuse 21 10a Underhood fuse block (right front strut tower) Vehicle spd 3.8L VIN 2, Engine Performance Wiring Diagram (3 of 5) for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (3 of 5) for Buick LaCrosse CX 2009: 37 1-2 shift solenoid (ss) valve 2-3 shift solenoid valve A red A/t fluid pressure (tfp) manual valve position switch A/t fluid temperature sensor A/t input shaft speed sensor Air pres sens At iss sig Automatic transmission Automatic transmission internal mode switch (ims) B tan G113 (lower left rear of engine, near starter) Ho2s heater 2 Ho2s sig high Ho2s sig low Iat sensor sig Low ref Maf sensor sig Pc sol Pnk Powertrain control module (pcm) Pressure control solenoid valve Red j115 Shift sol Tan Tcc sol Tcc sw sig Tft sensor sig Torque converter clutch (tcc) solenoid valve Torque sig Tr sw a Tr sw b Tr sw c Tr sw p Vehicle speed sensor (vss) assembly (right side of transmission) Vss sig W (not used) 3.8L VIN 2, Engine Performance Wiring Diagram (4 of 5) for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (4 of 5) for Buick LaCrosse CX 2009: 31 (in air intake tube) mass air flow (maf)/intake air temperature (iat) sensor (pzev) (near air cleaner duct) Air pump fuse 25 50a D11 Electronic brake control module (ebcm) (integral to brake pressure modulator valve) Emission fuse 12 10a Evaporative emissions (evap) canister vent solenoid valve (under left rear of vehicle) F12 From etc fuse 17 (diagram 2 of 5) Fuel pp fuse 22 15a Fuel pp relay G113 (lower left rear of engine, near starter) G115 (left rear of engine) Heated oxygen sensor (ho2s) 2 (downstream of catalytic converter) Hot at all times I/p fuse block (right side of dash) Iat J101 J114 J117 Nca O2 ssr fuse 14 15a P/train relay Pnk Pump relay Red Secondary air injection (air) Secondary air injection (air) pump (pzev) (lower left rear of engine) Tan Underhood fuse block (right front strut tower) W/o active brake control 3.8L VIN 2, Engine Performance Wiring Diagram (5 of 5) for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (5 of 5) for Buick LaCrosse CX 2009: 69 (clipped to knee bolster panel, right of data link connector) splice pack jx205 (front of front passenger's door sill) g302 (on left side of engine compt) a/c refrigerant pressure sensor 5 volt ref 1 5 volt ref 2 A/c clutch relay A/c press sig A12 A7 x2 Acc Air conditioning system B11 B12 Battery C12 Class 2 Class 2 data Clstr fuse 10a Computer data lines system Cooling fans system Cruise control system Cruise sig D1 x1 D10 D12 x2 Data link connector (left side of dash) E11 Eng speed sig Evap vent sol F11 Fuel level sig Fuel pump & sender assembly (in fuel tank) Fuel pump relay Fuel tank press Fuel tank pressure (ftp) sensor (in fuel tank) G202 (left side of dash) Gnd High fan Hot at all times Hot w/ ign 1 relay 37 energized I/p fuse block (right side of dash) Ign Ignition switch Ignition volt Instrument panel cluster (ipc) J211 Lock Logic Low fan Low ref Malfunction indicator lamp (mil) Mil control Navigation system Pcm fuse 10a Pcm relay Pcm/etc fuse 16 15a Pnk Power distribution system Powertrain control module Relay ctrl Run Serial data bus Start Starter enable Starting/charging system Stop lamp sw Underhood fuse block (right front strut tower) Vehicle speed sig X1 d8
5.3L VIN C 5.3L VIN C, Engine Performance Wiring Diagram (1 of 5) for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Engine Performance Wiring Diagram (1 of 5) for Buick LaCrosse CX 2009: 52 (left rear of engine) g113 5 volt ref 2 5-volt ref 1 Ckp sensor sig Cmp sensor sig Emissions 1 fuse 15a Engine control module (ecm) (left front of engine compt) Etc/ecm fuse 10a Fuel injector 1 Fuel injector 2 Fuel injector 3 Fuel injector 4 Fuel injector 5 Fuel injector 6 Fuel injector 7 Fuel injector 8 Ground Ho2s heater low Ho2s high signal Ho2s low signal Iat Iat sensor sig Ic 1 control Ic 2 control Ic 3 control Ic 4 control Ic 5 control Ic 6 control Ic 7 control Ic 8 control Ign 1 voltage Inj 1 fuse 20a Inj 2 fuse 20a J101 Knock sensor (ks) 1 Knock sensor (ks) 2 (lower right rear of engine) Knock sensor 1 signal Knock sensor 2 signal Low ref Maf sensor sig Mass air flow (maf)/ intake air temperature (iat) sensor (in air intake tube) Nca Oil pressure sw sig Red Tac motor control 1 Tac motor control 2 Tan Throttle actuator control (tac) module (top rear of engine) To pwr/trn relay (diagram 4 of 5) Tp sensor 1 sig Tp sensor 2 sig Underhood fuse block (right front strut tower) 5.3L VIN C, Engine Performance Wiring Diagram (2 of 5) for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Engine Performance Wiring Diagram (2 of 5) for Buick LaCrosse CX 2009: 27 (top left of engine) (top left side of engine) fuel injector (top of left valve cover) (top right of engine) (top right of engine) fuel injector Engine oil pressure (eop) sensor (top rear of engine) Fuel injector G112 (left rear of engine) Harness, approximately 5 cm from x107) j134 Heated oxygen (ho2s) sensor 1 (right side of engine) Heated oxygen (ho2s) sensor 2 (downstream of catalytic converter) Ignition coil 1 Ignition coil 3 Ignition coil 5 Ignition coil 7 J106 J108 J109 J130 Nca Pnk Pnk d Red Red c Spark plug Tan Tan a 5.3L VIN C, Engine Performance Wiring Diagram (3 of 5) for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Engine Performance Wiring Diagram (3 of 5) for Buick LaCrosse CX 2009: 35 (front of right cylinder head) camshaft position (cmp) sensor (on left side of engine compt) a/c refrigerant pressure sensor (right rear of engine) (top of right valve cover) (top right rear of engine) evaporative emission (evap) canister purge solenoid valve (under left rear of vehicle) evaporative emissions (evap) canister vent solenoid valve 5 cm from x112) j135 A/c refrigerant Cnstr fuse 10a Crankshaft position (ckp) sensor Cylinder shutoff 4 Cylinder shutoff 7 Ect sensor sig Engine control module (ecm) (left front of engine compt) G112 (left rear of engine) Hot at all times I/p fuse block (right side of dash) Ignition coil 2 Ignition coil 4 Ignition coil 6 Ignition coil 8 J105 J131 Lines system computer data Map sensor sig Nca Pnk Pnk d Red Red c Serial data bus (+) Spark plug System transmissions Underhood fuse block (right front strut tower) Vehicle speed sig 5.3L VIN C, Engine Performance Wiring Diagram (4 of 5) for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Engine Performance Wiring Diagram (4 of 5) for Buick LaCrosse CX 2009: 43 (diagram 1 of 5) (top rear of engine) valve lifter oil manifold (vlom) assembly 5 volt ref 1 Acc Brakes system anti-lock Cooling fans system Cylinder shutoff 1 Cylinder shutoff 6 Delivered torque Ecm ign fuse 10a Ecm/ tcm fuse 15a Emiss- ions 2 fuse 15a Engine control module (ecm) (left front of engine compt) Engine coolant temperature (ect) sensor (left front of engine) Evap canister purge From etc/ecm fuse a Generator field Generator sig Hot at all times Hot w/ ignition main pcb relay energized Ignition switch Lines system computer data Lock Low ref Low speed cooling Manifold absolute pressure (map) sensor (top left rear of engine) Park/neutral sig Pnk Power distribution system Pwr/trn relay Red Requested torque Run Serial data bus (-) Shutoff cylinder solenoid 1, cylinder 1 Shutoff cylinder solenoid 2, cylinder 4 Shutoff cylinder solenoid 3, cylinder 6 Shutoff cylinder solenoid 4, cylinder 7 Start System charging starting/ Tan Transmissions system Underhood fuse block (right front strut tower) 5.3L VIN C, Engine Performance Wiring Diagram (5 of 5) for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Engine Performance Wiring Diagram (5 of 5) for Buick LaCrosse CX 2009: 63 (front of front passenger's door sill) g302 5 volt ref 1 5 volt ref 2 A/c compressor A12 Acc voltage Accelerator pedal position (app) sensor (left side of dash) Air conditioning system cooling fans system Anti-lock brakes system App sensor 1 sig App sensor 2 sig B12 Batt pos voltage Brake booster sig Brake booster vacuum sensor (on brake booster) C12 Class 2 Clstr fuse 10a Computer data lines system Cooling fan rly Cruise control sw Cruise control system D1 x1 D12 x2 Engine control module (ecm) (left front of engine compt) Engine speed sig Evap canister vent Exterior lights system Fuel level sens Fuel pump & sender assembly (in fuel tank) Fuel pump rly Fuel tank pressure (ftp) sensor (in fuel tank) Fuel tank sens Fuel/ pump fuse 15a Fuel/ pump relay G113 (left rear of engine) G202 (left side of dash) Gnd H6 x4 Hot at all times I/p fuse block (right side of dash) Ign Ign 1 voltage Instrument panel cluster (ipc) J101 J211 Logic Low ref Low reference Mil control Mil ind Navigation system Pnk Powertrain rly Serial data Starter enable Starting/ charging system Stop lamp sw sig Tan Underhood fuse block (right front strut tower) Vehicle speed sig X1 h1 X2 c6
EXTERIOR LIGHTS Exterior Lamps Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Exterior Lamps Wiring Diagram for Buick LaCrosse CX 2009: 89 (left taillight wiring harness) j902 (license lamp harness, near left license lamp) j402 (right front strut tower) underhood fuse block (right taillight wiring harness) j903 10 volt ref 3.8l 5.3l Anti-lock brakes & engine controls systems Anti-lock brakes system Auto Batt positive volt Bcm class 2 Bcm class 2 serial data Body control module (bcm) (left side of dash) Brake pedal position sensor (left side of dash) Center high mounted stop lamp (chmsl) Chmsl/ bkup fuse 15a Computer data lines system Driver information center (dic) switch G100 (right front of engine compt) G101 (left front of engine compt) G202 (left side of dash) G301 (front of driver's door sill) G302 (front of front passenger's door sill) H5 x1 Hazard Hazard sw sig Hazrd fuse 20a Head Headlamp switch Hot at all times I/p fuse block (right side of dash) Ign Instrument panel cluster (ipc) Ipc class 2 serial data J111 J112 J113 J124 J211 J214 J401 J406 J900 J901 Left Left front marker lamp Left license lamp Left park/ turn signal lamp Left rear marker lamp Left tail/ stop & turn signal lamp Left turn indicator Left turn sw sig Logic Low ref Lower left tail lamp Lower right tail lamp Lr stop/turn volt Off Park Park lamp on sig Park lmp rly ctrl Prk lamp fuse 10a Prk/ lamp relay Right Right front marker lamp Right license lamp Right park/ turn signal lamp Right rear marker lamp Right tail/ stop & turn signal lamp Right turn indicator Right turn sw sig Rr stop/turn volt Splice pack jx307 (body wiring harness, under passenger seat, at rear carpet) Sply volt Stop lamp sw sig Tan Turn signal/ multi-function switch Upper left tail lamp Upper right tail lamp X1 c2 X1 e2 X1 f2 X2 a2 X2 a6 X2 e11 X2 f9 X3 a9 X3 c6
3.8L VIN 2 3.8L VIN 2, Backup Lamps Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Backup Lamps Wiring Diagram for Buick LaCrosse CX 2009: 23 (lower left rear of engine, near starter) g113 Automatic transmission Automatic transmission internal mode switch (ims) Backup lamp sply volt Battery positive volt Bcm class 2 serial data Body control module (bcm) (left side of dash) Chmsl/ bkup fuse 15a Computer data lines system G301 (front of driver's door sill) G302 (front of front passenger's door sill) Hot at all times I/p fuse block (right side of dash) J101 J900 J901 Left backup lamp Pcm class 2 serial data Powertrain control module (pcm) Right backup lamp Splice pack jx307 (body wiring harness, under passenger seat, at rear carpet) Tr sw sig a Tr sw sig b
5.3L VIN C 5.3L VIN C, Backup Lamps Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Backup Lamps Wiring Diagram for Buick LaCrosse CX 2009: 24 (left side of engine) g115 Automatic transmission Automatic transmission internal mode switch (ims) Backup lamp sply volt Battery positive volt Bcm class 2 serial data Body control module (bcm) (left side of dash) Chmsl/ bkup fuse 15a Computer data lines system G301 (front of driver's door sill) G302 (front of front passenger's door sill) Gmlan ser data Hot at all times I/p fuse block (right side of dash) J125 J900 J901 Left backup lamp Right backup lamp Splice pack jx307 (body wiring harness, under passenger seat, at rear carpet) Tan Tr sig a Tr sig b Transmission control module (tcm) (left front of engine compt)
GROUND DISTRIBUTION Ground Distribution Wiring Diagram (1 of 3) for Buick LaCrosse CX 2009 List of elements for Ground Distribution Wiring Diagram (1 of 3) for Buick LaCrosse CX 2009: 66 (3.8l) ignition control module (icm) (3.8l) right engine cooling fan (5.3l) right engine cooling fan (california pzev) secondary air injection (air) shutoff valve (engine wiring harness, approximately 5 cm from left front wheel speed sensor connector breakout) (if equipped) right front fog lamp (right front strut tower) underhood fuse block (w/ abs) electronic brake control module (ebcm) (w/ remote keyless entry & left cargo net restraint) hood ajar switch 3.8l 3.8l & california pzev 5.3l A/c clu diode A/c compressor clutch Automatic transmission Automatic transmission internal mode switch (ims) B b Battery Body control module (bcm) C11 E15 Engine oil level (eol) switch Engine oil pressure (eop) switch Except california pzev Fan 2 relay 46 (3.8l) fan 2 relay (5.3l) Fuel pp relay 41 G100 (right front of engine compt) G101 (left front of engine compt) G102 (3.8l: near battery) G111 (3.8l: lower left rear of engine) G112 (top front of engine) G113 (3.8l) (lower left rear of engine, near starter) G115 (left rear of engine) Harness, 20 cm from g115) Harness, approximately 10 cm from breakout to x142) Hdm beam relay 35 Horn assembly Ign 1 relay 37 J101 (engine wiring harness, 5 cm from breakout to pcm) J102 (engine wiring harness, 5 cm from breakout to throttle body) J112 (forward lamp harness, 19 cm from left front headlight assembly) J124 (forward lamp wiring harness, behind right headlight, 5 cm from breakout to x142) J125 J127 (left headlight wiring harness) Jumper wiring harness, 5 cm from breakout to left park/turn signal lamp) K14 Left front fog lamp Left front marker lamp Left high beam headlamp Left low beam headlamp Left park/ turn signal lamp Mass air flow (maf)/ intake air temperature (iat) sensor Powertrain control module (pcm) Right front marker lamp Right high beam headlamp Right low beam headlamp Right park/ turn signal lamp Secondary air injection (air) pump Throttle body Transmission control module (tcm) Windshield washer fluid level switch Windshield washer fluid pump Wiper relay 45 Wiring harness) X100 X3 a5 Ground Distribution Wiring Diagram (2 of 3) for Buick LaCrosse CX 2009 List of elements for Ground Distribution Wiring Diagram (2 of 3) for Buick LaCrosse CX 2009: 73 (if equipped) driver seat adjuster switch (if equipped) passenger seat adjuster switch (right front strut tower) underhood fuse block (w/ accessory steering wheel control) right steering wheel control switch (w/ lumbar seats) driver seat lumbar switch A/c compressor clutch Automatic transmission shift lever position indicator Automatic transmission shift lock control solenoid Body control module (bcm) Driver back heated seat element Driver door lock Driver door lock switch Driver heated seat relay Driver outside rearview mirror Driver seat belt buckle Driver window switch Electronic compass module Engine control module (ecm) Front Fuel/ pump relay G112 (5.3l) (left rear of engine) G113 (5.3l) (left rear of engine) G201 (center of dash) G301 (front of driver's door sill) Hdm Horn switch Ignition coil 1 Ignition coil 2 Ignition coil 3 Ignition coil 4 Ignition coil 5 Ignition coil 6 Ignition coil 7 Ignition coil 8 Ignition main pcb relay Inflatable restraint steering wheel module coil J130 J131 (engine wiring harness, 30.5 cm from g130) J215 (steering column wiring harness) J303 (body wiring harness, 19 cm from breakout to g301) J330 (driver's seat wiring harness, 4.5 cm from breakout to seat belt switch) J333 (in front passenger seat wiring harness, 7 cm from breakout to seat belt pretensioner) J401 (license lamp harness, near left license lamp) J500 (left front door wiring harness, 8.5 cm from breakout to window motor) J900 (left taillight wiring harness) Left backup lamp Left license lamp Left rear door lock Left rear marker lamp Left steering wheel control switch Left tail/stop & turn signal lamp Lower left tail lamp Mass air flow (maf)/ intake air temperature (iat) sensor Nca Outside rearview mirror switch Passenger back heated seat element Passenger heat seat relay Passenger seat belt buckle Rear object sensor control module Rear window defogger grid Right license lamp Seats heater Upper left tail lamp W/ front compartment floor console W/ parking assist W/ power seats W/o power seats Wiper pcb relay Wiring harness) X2 a X2 b X275 X277 Ground Distribution Wiring Diagram (3 of 3) for Buick LaCrosse CX 2009 List of elements for Ground Distribution Wiring Diagram (3 of 3) for Buick LaCrosse CX 2009: 96 (automatic a/c) hvac control module (automatic a/c) inside air temperature sensor (if equipped) inside rearview mirror (isrvm) (right front door wiring harness, 25.5 cm from breakout to inline connector x304) (right front strut tower) underhood fuse block (w/ digital radio) digital radio receiver (w/ inside mirror) left rear courtesy/ reading lamp (w/ inside mirror) left sunshade (w/ inside mirror) right rear courtesy/ reading lamp (w/ inside mirror) right sunshade 3.8l 5.3l A12 x1 A15 Ambient light sensor Audio amplifier Automatic a/c Automatic transmission shift lock control solenoid B1 x2 B5 x1 B8 x1 Blower motor control module Body control module (bcm) Brake fluid level switch Center console auxiliary power outlet Center high mounted stop lamp (chmsl) Custom 9 speaker system D x1 Data link connector (dlc) Driver information center (dic) switch F14 F7 x2 Fuel pump & sender assembly G200 (left side of dash) G202 (left side of dash) G302 (front of front passenger's door sill) Garage door opener (gdo) (if equipped) Head- lamp switch Headlamp switch Hvac control module I/p accessory power outlet I/p compartment lamp switch I/p fuse block (right side of dash) If equipped Ignition lock cylinder control actuator Ignition switch Inflatable restraint passenger air bag on/off indicator Inflatable restraint passenger presence system (pps) module Inflatable restraint sensing & diagnostic module (sdm) Instrument panel cluster (ipc) J211 (i/p wiring harness, 10 cm from breakout to data link connector) J213 (i/p wiring harness, 5 cm from breakout to data link connector) J300 J310 J390 (headliner wiring harness, 20 cm from right courtesy/ reading lamp breakout) J406 (body wiring harness, 9 cm from breakout to inline connector x800) J604 J605 (right front door trim wiring harness, 5 cm from breakout to door lock switch) Left i/p courtesy lamp Left overhead console courtesy/ reading lamp Left vanity mirror lamp Lower right tail lamp Manual a/c Nca Overhead console courtesy/ reading lamps Passenger door lock Passenger door lock switch Passenger outside rearview mirror Passenger window switch Radio Rear compartment lid latch Remote control door lock receiver (rcdlr) Right backup lamp Right i/p courtesy lamp Right overhead console courtesy/ reading lamp Right rear door lock Right rear marker lamp Right tail/stop & turn signal lamp Right vanity mirror lamp Security indicator lamp Sunload sensor Sunroof motor Theft deterrent module (tdm) Turn signal/ multi-function switch Upper right tail lamp Vehicle communication interface module (vcim) W/ front compartment floor console W/ inside mirror W/ onstar W/o front compartment floor console Windshield wiper motor Wiper hi relay 44 (3.8l) wiper hi pcb relay (5.3l) Wiper relay 45 (3.8l) wiper pcb relay (5.3l) Wiring harness) X1 a6 X2 g
HEADLIGHTS
3.8L VIN 2 3.8L VIN 2, Headlights Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Headlights Wiring Diagram for Buick LaCrosse CX 2009: 76 A10 A11 A12 Ambient light sensor (center of dash) Auto Automatic a/c B3 x1 Bcm Bcm class 2 serial data Body control module (bcm) (left side of dash) C10 C11 C12 Class 2 serial data Clstr fuse 10a Computer data lines system Drl ambient light sens sig x1 E10 x2 E19 E20 Extr lamps off in Flash to pass sw sig x3 Fog Fog lamp rly ctrl Fog lp relay 36 Fog lps fuse 7 10a Front fog light ind Frt fog lamp sw sig Ftp G100 (right front of engine compt) G101 (left front of engine compt) G113 (lower left rear of engine, near starter) G19 G20 G202 (left side of dash) Gnd Hdlp dimmer sw hi beam sig Hdlp hi beam rly ctrl Hdlp mod volt sply Hdlp suggest ind Hdlp sw hdlps on sig Hdm beam relay 35 Head Headlamp switch Hi beam relay High High beam ind Hot at all times I/p fuse block (right side of dash) Ign Instrument panel cluster (ipc) J101 J111 J113 J126 J127 J211 J214 Left front fog lamp Left high beam headlamp Left low beam headlamp Lf hi beam fuse 1 10a Lf lo beam fuse 3 10a Logic Low Manual a/c Off Park Rf hi beam fuse 2 10a Rf lo beam fuse 4 10a Right front fog lamp (if equipped) Right high beam headlamp Right low beam headlamp Sunload sensor assembly (center of dash) Turn signal/ multi-function switch Underhood fuse block (right front strut tower)
5.3L VIN C 5.3L VIN C, Headlights Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Headlights Wiring Diagram for Buick LaCrosse CX 2009: 66 A5 x2 Ambient light sensor (center of dash) Auto Automatic a/c Bcm Bcm class 2 serial data Body control module (bcm) (left side of dash) C2 x1 Class 2 serial data Clstr fuse 10a Computer data lines system Drl ambient light sens sig x1 Extr lamps off in Flash to pass sw sig x3 Fog Fog lamp rly ctrl Fog lamps fuse 10a Fog lps pcb relay Front fog light ind Frt fog lamp sw sig Ftp G100 (right front of engine compt) G101 (left front of engine compt) G113 (left rear of engine) G202 (left side of dash) Gnd Hdlp dimmer sw hi beam sig Hdlp hi beam rly ctrl Hdlp mod volt sply Hdlp suggest ind Hdlp sw hdlps on sig Hdm Head Headlamp switch Hi beam pcb relay High High beam ind Hot at all times I/p fuse block (right side of dash) Ign Instrument panel cluster (ipc) J101 J111 J113 J126 J127 J211 J214 Left front fog lamp Left high beam headlamp Left low beam headlamp Logic Low Lt hi beam fuse 10a Lt lo beam fuse 10a Manual a/c Off Park Right front fog lamp (if equipped) Right high beam headlamp Right low beam headlamp Rt hi beam fuse 10a Rt lo beam fuse 10a Sunload sensor assembly (center of dash) Turn signal/ multi-function switch Underhood fuse block (right front strut tower)
HORN Horn Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Horn Wiring Diagram for Buick LaCrosse CX 2009: 24 (center of dash) g201 3.8l 5.3l A2 x3 Body control module (bcm) (left side of dash) G100 (right front of engine compt) Ground distribution system Horn assembly (right front of vehicle) Horn fuse 11 15a Horn fuse 15a Horn pcb relay (5.3l) Horn relay (3.8l) Horn rly ctrl Horn switch Hot at all times Inflatable restraint steering wheel module coil (in steering column) J124 J215 K3 x2 Tan Underhood fuse block (right front strut tower) X275 c X277 X3 j3
INSTRUMENT CLUSTER Instrument Cluster Wiring Diagram, with Message Center (1 of 2) for Buick LaCrosse CX 2009 List of elements for Instrument Cluster Wiring Diagram, with Message Center (1 of 2) for Buick LaCrosse CX 2009: 86 (cool temp, trip odom & tachometer) (left side of dash) g202 (uplevel) 3.8l 5.3l Abs indicator Abs/tcs class 2 serial data Air bag indicator Air temp sens sig Ambient air temperature sensor (w/ tachometer) (center front of engine compt) B10 Bat pos voltage Bcm class 2 serial data Brake fluid level switch (on brake fluid reservoir) Brake indicator Brake warning ind ctrl Charging indicator Clstr fuse 10a Compass fuse 10a Compass sens feed Compass sens ret Computer data lines system Cruise indicator Defogger system Dic fuel signal Dic gage signal Dic menu sw sig Dic odo sig Dic set/reset sw sig Display Display fuse 18 10a Driver information center Driver information center (dic) Ecm/pcm class 2 serial data Electronic compass module (top right side of rear package shelf) Engine controls system Engine coolant temperature gage Engine coolant temperature indicator Engine oil level switch (lower center front of engine oil pan) Engine oil pressure (eop) switch Fog lamps indicator Fuel gauge G113 (lower left rear of engine, near starter) G202 (left side of dash) G301 (front of driver's door sill) Gnd High beam indicator Hot at all times Hot w/ ign 1 relay energized Hot w/ ign main pcb relay energized I/p fuse block (right side of dash) Ign Ign 1 voltage Instrument panel cluster (ipc) Interior lights system Ipc class 2 serial data Ipc/bcm class 2 serial data J211 J303 Km/h indicator Left turn indicator Logic Low fuel warning lamp indicator Low oil pressure indicator Low ref Low tire pressure indicator Malfunction indicator lamp (mil) Message request Mph indicator Pass seat belt ind Pcm/ecm class 2 serial data Pnk Pnk d11 Power distribution system Prnd321 Rear defog rly ctrl Red Right turn indicator Sdm class 2 serial data Seat belt indicator Speedometer Tachometer Tan Traction off indicator Turn audible indicator Underhood fuse block (right front strut tower) Instrument Cluster Wiring Diagram, with Message Center (2 of 2) for Buick LaCrosse CX 2009 List of elements for Instrument Cluster Wiring Diagram, with Message Center (2 of 2) for Buick LaCrosse CX 2009: 61 (driver's door) driver door lock (front of front passenger's door sill) g302 (front passenger's door) front passenger door lock (in fuel tank) fuel pump & sender assembly (left rear door) left rear door lock (right front strut tower) underhood fuse block (right rear door) right rear door lock (right side of dash) i/p fuse block 3.8l 5 v ref 1 5.3l 5v ref 1 A12 Air conditioning system Anti-lock brakes system B12 Bcm class 2 serial data x1 Body control module (bcm) (left side of dash) Computer data lines system Cool temp, trip odom & tacho- meter Door lock ajar indicator switch Driver information center (dic) switch (if equipped) E/m cool temp, trip odom & tacho- meter Engine control module (ecm) (left front of engine compt) Engine controls system Engine oil pressure (eop) sensor (5.3l) (top rear of engine) Exterior lights system Fuel Fuel level sensor Fuel lvel sig G202 (left side of dash) G301 (front of driver's door sill) G302 (front of front passenger's door sill) Gauges Hazard Info Interior lights system J211 J303 J406 J500 J604 Lf dr ajar sw sig Low ref Lr dr ajar sw sig Oil lvl sw sig Oil press sw Park brake sw sig Park brake switch (on park brake assembly) Pnk Powertrain control module (pcm) Rear compartment lid latch (in trunk lid) Rear lid ajar sw x2 Red Rf dr ajar sw sig Rr dr ajar sw sig Serial data Set/reset Tan Traction control Trip odo Instrument Cluster Wiring Diagram, without Message Center (1 of 2) for Buick LaCrosse CX 2009 List of elements for Instrument Cluster Wiring Diagram, without Message Center (1 of 2) for Buick LaCrosse CX 2009: 60 (left side of dash) g202 Abs indicator Abs/tcs class 2 serial data Air bag indicator Bat pos voltage Bcm class 2 serial data Brake fluid level switch (on brake fluid reservoir) Brake indicator Brake warning ind ctrl Change oil indicator Charging indicator Check gas cap indicator Clstr fuse 10a Computer data lines system Cruise indicator Display Door ajar indicator E8 x1 Engine controls system Engine coolant temperature gage Engine coolant temperature indicator Fog lamp indicator Fuel fill side indicator Fuel gauge G202 (left side of dash) Gnd High beam indicator Hot at all times I/p fuse block (right side of dash) Ign Ign pcm class 2 serial data Instrument panel cluster (ipc) Interior lights system Ipc class 2 serial data Ipc/bcm class 2 serial data J211 Km/h indicator Left turn indicator Logic Low coolant indicator Low ref Low tire pressure indicator Low washer fluid indicator Malfunction indicator lamp (mil) Mph indicator Oil level indicator lamp Park brake switch (on park brake assembly) Pass seat belt ind Pcm class 2 serial data Prnd321 Rear hatch ajar indicator Reduced engine power indicator Right turn indicator Sdm class 2 serial data Seat belt indicator Security indicator Service vehicle soon indicator Speedometer Tachometer Traction off indicator Instrument Cluster Wiring Diagram, without Message Center (2 of 2) for Buick LaCrosse CX 2009 List of elements for Instrument Cluster Wiring Diagram, without Message Center (2 of 2) for Buick LaCrosse CX 2009: 37 A12 B12 Bcm class 2 serial data Body control module (bcm) (left side of dash) Computer data lines system Door lock ajar indicator switch Driver door lock (driver's door) Engine controls system Engine oil level (eol) switch (lower center front of engine oil pan) Engine oil pressure (eop) switch Front passenger door lock (front passenger's door) Fuel level sensor Fuel lvel sig Fuel pump & sender assembly (in fuel tank) G113 (lower left rear of engine, near starter) G301 (front of driver's door sill) G302 (front of front passenger's door sill) I/p fuse block (right side of dash) J303 J406 J500 J604 Left rear door lock (left rear door) Lf dr ajar sw sig Low ref Lr dr ajar sw sig Oil lvl sw sig Oil press sw Park brake sw sig Powertrain control module (pcm) Rear compartment lid latch (in trunk lid) Rear lid ajar sw Rf dr ajar sw sig Right rear door lock (right rear door) Rr dr ajar sw sig Serial data Underhood fuse block (right front strut tower)
INTERIOR LIGHTS Courtesy Lamps Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Courtesy Lamps Wiring Diagram for Buick LaCrosse CX 2009: 61 (front of driver's door sill) g301 (headliner wiring harness, 10 cm from right courtesy/reading lamp breakout) j393 (headliner wiring harness, 7.5 cm from right courtesy/reading lamp breakout) j398 (left side of dash) body control module (bcm) (left side of dash) g202 (w/ inside mirror) Battery pos volt Courtesy lp sw on sig D10 Defeat Dome Driver door lock (driver's door) Front passenger door lock (front passenger's door) G200 (left side of dash) G302 (front of front passenger's door sill) Headlamp switch Hot at all times I/p compartment lamp switch I/p dimming return I/p fuse block (right side of dash) Int/illum fuse 10a J211 J213 J303 J308 J309 J390 J406 J500 J604 Left i/p courtesy lamp Left overhead console courtesy/ reading lamp Left overhead console courtesy/ reading lamp switch Left rear courtesy/ reading lamps Left rear door lock (left rear door) Left sunshade Left vanity mirror lamp Lf door ajar sw sig Lf door open sw sig Lr door ajar sw sig Lr door open sw sig Off Overhead console courtesy/ reading lamps Power courtesy lamp Rear compartment courtesy lamp Rear compartment lid latch (in trunk lid) Rf door ajar sw sig Rf door open sw sig Right i/p courtesy lamp Right overhead console courtesy/ reading lamp Right overhead console courtesy/ reading lamp switch Right rear courtesy/ reading lamps Right rear door lock (right rear door) Right sunshade Right vanity mirror lamp Rr door ajar sw sig Rr door open sw sig Tan W/ inside mirror W/o inside mirror X2 c4 Instrument Illumination Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Instrument Illumination Wiring Diagram for Buick LaCrosse CX 2009: 56 (i/p wiring harness, 21 cm from lamp assembly switch) 10 volt ref Auto Automatic transmission shift lever position indicator (console shift) Battery current sensor (near battery) Battery positive voltage Bcm class 2 serial data Body control module (bcm) (left side of dash) C x275 Computer data lines system Driver door lock switch Driver information center (dic) Driver window switch F x275 G200 (left side of dash) G201 (center of dash) G202 (left side of dash) G301 (front of driver's door sill) G302 (front of front passenger's door sill) Ground Ground distribution system Head Headlamp switch Hot at all times Hvac control module (center of dash) I/p dimming return I/p dimming signal I/p fuse block (right side of dash) Illum Inflatable restraint steering wheel module coil (in steering column) Instrument panel cluster (ipc) Int/ illum fuse 10a J203 (i/p wiring harness, 4 cm from second breakout from dlc connector) J204 J211 J213 J214 J215 J280 (instrument panel harness, approximately 4 cm from second breakout from data link connector) J303 J501 J502 (left front door trim harness, 5 cm from breakout to door lock switch) J605 Left steering wheel control switch Off Outside rearview mirror switch Park Park lamp sw on sig Passenger door lock switch Passenger window switch Pnk Radio Right steering wheel control switch (w/ accessory steering wheel control) Sply volt Str/whl/ illum fuse 2a X277
NAVIGATION Navigation Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Navigation Wiring Diagram for Buick LaCrosse CX 2009: 22 (left side of dash) g202 10a Adg class 2 serial data Antenna Audio comm sig B10 Bare Cellular & digital radio antenna (digital radio antenna: center rear of roof) Coax Computer data lines system Drain wire Gnd Hot at all times I/p fuse block (right side of dash) Lf audio sig (+) Lf audio sig (+) Navigation antenna (under center of rear package shelf) Nca Onstar aldl fuse Power distribution system Radio Vehicle communication interface module (vcim) (center of dash) Parking Assistant Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Parking Assistant Wiring Diagram for Buick LaCrosse CX 2009: 55 (front of driver's door sill) g301 3.8l 5.3l A rear parking assist (rpa) diagnostic connector (left side of trunk) A9 x2 Backup lamp sply voltage Body control module (bcm) (left side of dash) Center amber ind Center amber ind ctrl Chime control Compass fuse 10a D11 Display fuse 18 10a Engine control module (ecm) (left front of engine compt) Engine controls system F11 Ground H1 x2 Hot w/ ign 1 relay 37 energized Hot w/ ignition main pcb relay energized I/p fuse block (right side of dash) Ign voltage J2 x4 J303 J450 (rpa wiring harness, 7 cm from breakout for right object alarm sensor) J451 (rpa wiring harness, 7 cm from breakout for right object alarm sensor) Left amber ind Left amber ind ctrl Left rear corner object sensor (left side of rear bumper) Left rear middle object sensor (middle of rear bumper) Lr corner object sens sig Lr middle object sens sig Object alarm module Object sens low ref Object sens sply voltage Pnk Power distribution system Powertrain control module (pcm) Rear parking assist (rpa) display Rear parking diagnostic sig Red Red ind Red ind ctrl Right rear corner object sensor (right side of rear bumper) Right rear middle object sensor (middle of rear bumper) Rr corner object sens sig Rr middle object sens sig Splice pack jx307 (body wiring harness, under passenger seat, at rear carpet) Telltale assembly sply voltage Underhood fuse block (right front strut tower) Vehicle speed sig Vss sig X1 e10 X2 b11 X2 e3
POWER DISTRIBUTION
3.8L VIN 2 3.8L VIN 2, Power Distribution Wiring Diagram (1 of 3) for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Power Distribution Wiring Diagram (1 of 3) for Buick LaCrosse CX 2009: 87 (approximately 5 cm from breakout to g302) (driver seat wiring harness, (right front strut tower) underhood fuse block (sunroof wiring harness, 7.5 cm from sunroof motor) 4.5 cm from breakout to seat lumbar switch) j331 A1 x1 Abs mtr fuse 31 40a Abs sol fuse 19 25a Air pump fuse 25 50a Audio amplifier (w/ 9 speaker system) Automatic a/c B10 Batt main 1 fuse 26 40a Batt main 2 fuse 27 50a Batt main 3 fuse 28 40a Batt main 4 fuse 30 30a Battery Blower motor control module Body control module (bcm) C10 Chmsl/ bkup fuse 15a Clstr fuse 10a Cnstr fuse 10a D10 Data link connector (dlc) Digital radio receiver Dr/lck trunk fuse 15a Driver heated seat relay (if equipped) Driver seat adjuster switch Driver seat lumbar switch Driver window switch E x2 E12 Electronic brake control module (ebcm) (w/ abs) Evaporative emission (evap) canister vent solenoid valve F10 Generator Hazrd fuse 20a Htd/ seat fuse 20a Hvac control module Hvac fuse 10a I/p fuse block (right side of dash) Inflatable restraint passenger presence system (pps) module Inside rearview mirror Instrument panel cluster (ipc) Int/ illum fuse 10a J395 Manual a/c Nca Onstar/ aldl fuse 10a Outside rear- view mirror switch Park switch (floor console front compartment) Passenger heated seat relay (if equipped) Passenger seat adjuster switch (if equipped) Passenger window switch Pcm/ etc fuse 16 15a Power lumbar control seat Powertrain control module (pcm) Prk/ lamp relay Prk/ switch fuse 5a Prk/lamp fuse 10a Pwr/ mir fuse 10a Pwr/ seat circuit breaker 25a Pwr/wndw circuit breaker 25a R/ defog relay Radio Rap relay Rdo/ amp fuse 25a Red Remote control door lock receiver (rcdlr) Rfa/ mod fuse 10a S/roof fuse 20a Secondary air injection (air) pump relay (w/ california pzev emission system) Starter Sunroof motor To tcm fuse 8 (diagram 2 of 3) Vehicle communication interface module (vcim) (w/ onstar) W/ digital audio system W/ driver W/ sunroof W/o digital audio system W/o driver W/o sunroof Washer/ rvc fuse 6 15a X1 d12 X2 f9 X4 c2 3.8L VIN 2, Power Distribution Wiring Diagram (2 of 3) for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Power Distribution Wiring Diagram (2 of 3) for Buick LaCrosse CX 2009: 78 (automatic transmission wiring harness, 19 cm from inline connector x100) j115 (left side of dash) g200 (steering column wiring harness, near ignition switch) j200 1-2 shift solenoid (ss) valve 12 volt reference 2-3 shift solenoid (ss) valve A/c clutch fuse 13 10a A/c comp relay 38 A10 A11 A2 x1 Abs fuse 23 10a Acc Automatic a/c Automatic transmission Aux pwr fuse 10 25a Body control module (bcm) Center console accessory power outlet Crank relay Crank voltage Cruise fuse 2a D11 Display fuse 18 10a E12 Electronic brake control module (ebcm) Electronic compass module (w/ driver information center display) F12 From ign 1 relay 37 (diagram 2 of 3) From washer/rvc a fuse 6 (diagram 1 of 3) G113 (lower left rear of engine, near starter) G202 (left side of dash) G302 (front of front passenger's door sill) Hvac control module I/p accessory power outlet I/p fuse block (right side of dash) Ign 1 relay 37 Ignition switch Ignition voltage Inflatable restraint front passenger presence system module (pps) Inflatable restraint passenger air bag on/off indicator Inflatable restraint sensing & diagnostic module (sdm) Inflatable restraint steering wheel module coil Inside air temperature sensor J101 J213 J214 J406 Key in ignition switch Key in ignition switch signal Left steering wheel control switch Lock Manual a/c Nca Object alarm module P/train relay 40 Pcm fuse 15 10a Pnk Powertrain control module (pcm) Red Run Sir fuse 9 10a Start Steering angle sensor (w/ active brake control) To a/c clutch fuse (diagram 2 of 3) To etc fuse 17 (diagram 3 of 3) To fan 2 fuse 32 (diagram 3 of 3) Torque converter clutch (tcc) solenoid valve Trans sol fuse 21 10a Underhood fuse block (right front strut tower) W/ park assist X1 b3 X1 b4 X100 X2 a12 X2 b9 X275 X277 Yaw & lateral acceleration sensor (w/ active brake control) 3.8L VIN 2, Power Distribution Wiring Diagram (3 of 3) for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Power Distribution Wiring Diagram (3 of 3) for Buick LaCrosse CX 2009: 58 (engine wiring harness, 8 cm from breakout to fuel injector 3) j109 02 ssr fuse 14 15a A11 A18 A19 C10 C11 Crank relay 48 D11 E14 Elec ign fuse 24 15a Emission fuse 12 10a Etc fuse 17 15a Evaporative emission (evap) canister purge solenoid valve Fan 1 fuse 29 30a Fan 1 relay 42 Fan 2 fuse 32 30a Fan 2 relay 46 Fan 3 relay 43 Fog lp relay 36 Fog lps fuse 7 15a From emission e fuse 12 (diagram 3 of 3) From p/train b relay 40 (diagram 2 of 3) From p/train d relay 40 (diagram 2 of 3) Fuel inj fuse 20 15a Fuel injector 1 Fuel injector 2 Fuel injector 3 Fuel injector 4 Fuel injector 5 Fuel injector 6 Fuel pp fuse 22 15a Fuel pp relay 41 G19 G20 Hdm beam relay 35 Heated oxygen sensor (ho2s) 1 Heated oxygen sensor (ho2s) 2 Hi beam relay 34 Horn fuse 11 15a Horn relay 39 Ignition control module (icm) J117 K15 K18 K19 Mass air flow (maf)/ intake air temperature (iat) sensor Nca Pnk Secondary air injection (air) pump relay Secondary air injection (air) pump solenoid relay Starter fuse 33 40a Throttle body To elek ign fuse 24 (diagram 3 of 3) Underhood fuse block (right front strut tower) W/ california pzev emission system Wiper relay 45 Wiper/ws fuse 5 25a
5.3L VIN C 5.3L VIN C, Power Distribution Wiring Diagram (1 of 3) for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Power Distribution Wiring Diagram (1 of 3) for Buick LaCrosse CX 2009: 85 (right front strut tower) underhood fuse block (sunroof wiring harness, 7.5 cm from sunroof motor) Abs mtr fuse 40a Abs sol fuse 25a Audio amplifier (w/ 9 speaker system) Automatic a/c B10 Batt 1 fuse 50a Batt 2 fuse 50a Batt 3 fuse 40a Batt 4 fuse 30a Battery Blower motor control module Body control module (bcm) Chmsl/ bkup fuse 15a Clstr fuse 10a Cnstr fuse 10a D10 Data link connector (dlc) Digital radio receiver Dr/lck trunk fuse 15a Driver heated seat relay (if equipped) Driver seat adjuster switch Driver seat lumbar switch Driver window switch E x2 E12 Ecm/ tcm fuse 15a Electronic brake control module (ebcm) (w/ abs) Engine control module (ecm) Evaporative emission (evap) canister vent solenoid valve F10 Generator Hazrd fuse 20a Htd/ seat fuse 20a Hvac control module Hvac fuse 10a I/p fuse block (behind right side of dash) Inflatable restraint passenger presence system (pps) module Inside rearview mirror Instrument panel cluster (ipc) Int/ illum fuse 10a J331 J395 Manual a/c Nca Onstar/ aldl fuse 10a Outside rear- view mirror switch Park switch (floor console front compartment) Passenger heated seat relay (if equipped) Passenger seat adjuster switch (if equipped) Passenger window switch Power lumbar control seat Prk/ lamp relay Prk/ switch fuse 5a Prk/lamp fuse 10a Pwr/ mir fuse 10a Pwr/ seat circuit breaker 25a Pwr/wndw circuit breaker 25a R/ defog relay Radio Rap relay Rdo/ amp fuse 25a Red Remote control door lock receiver (rcdlr) Rfa/ mod fuse 10a S/roof fuse 20a Starter Sunroof motor To aux pwr fuse (diagram 2 of 3) Transmission control module (tcm) Vehicle communication interface module (vcim) (w/ onstar) W/ digital audio system W/ driver W/ sunroof W/o digital audio system W/o driver W/o sunroof Wsw/ rvc fuse 15a X1 a1 X1 d12 X2 e2 X2 f9 X2 g1 X4 f1 5.3L VIN C, Power Distribution Wiring Diagram (2 of 3) for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Power Distribution Wiring Diagram (2 of 3) for Buick LaCrosse CX 2009: 75 (automatic transmission wiring harness, inside 19 cm from inline connector x100) j115 (in steering column wiring harness, near ignition switch) j200 (left side of dash) g200 1-2 shift solenoid (ss) valve 12 volt reference 2-3 shift solenoid (ss) valve A10 A2 x1 Abs fuse 10a Acc Air bag/ display fuse 10a Automatic a/c Automatic transaxle Aux pwr fuse 25a Body control module (bcm) Center console accessory power outlet Compass fuse 10a Crank voltage Cruise fuse 2a D11 E12 Ecm ign fuse 10a Electronic brake control module (ebcm) Electronic compass module (w/ driver information center display) Engine control module (ecm) From ignition main pcb relay (diagram 2 of 3) From wsw/rvc a fuse (diagram 1 of 3) G113 (left rear of engine) G202 (left side of dash) G302 (front of front passenger's door sill) Hvac control module Hvac fuse 10a I/p accessory power outlet I/p fuse block (right side of dash) Ignition main pcb relay Ignition switch Ignition voltage Inflatable restraint passenger air bag on/off indicator Inflatable restraint passenger presence system module (pps) Inflatable restraint sensing & diagnostic module (sdm) Inflatable restraint steering wheel module coil Inside air temperature sensor J101 J213 J214 J406 Key in ignition switch Key in ignition switch signal Left steering wheel control switch Lock Manual a/c Nca Object alarm module Pnk Pwr/trn relay Red Run Start Steering angle sensor (w/ active brake control) Strtr relay To etc/ecm fuse (diagram 3 of 3) To fan 2 relay (diagram 3 of 3) To strtr relay (diagram 2 of 3) Torque converter clutch (tcc) solenoid valve Trans fuse 10a Transmission control module (tcm) Underhood fuse block (right front strut tower) W/ park assist X1 c2 X100 X2 b9 X275 X277 X4 h1 Yaw & lateral accelerometer sensor (w/ active brake control) 5.3L VIN C, Power Distribution Wiring Diagram (3 of 3) for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Power Distribution Wiring Diagram (3 of 3) for Buick LaCrosse CX 2009: 46 (engine wiring harness, approx. 5 cm from breakout to fuel injector 4) j109 (engine wiring harness, approximately 5 cm from fuel injector 3) j108 (pre-engine wiring harness 5 cm from ignition coil 1) j106 (right front strut tower) underhood fuse block A/c cmprsr relay Cylinder shutoff solenoid 1 Cylinder shutoff solenoid 2 Cylinder shutoff solenoid 3 Cylinder shutoff solenoid 4 Emissions 1 fuse 15a Emissions 2 fuse 15a Engine control module (ecm) Etc/ecm fuse 15a Evaporative emission (evap) canister purge solenoid valve Fan 1 fuse 30a Fan 1 relay Fan 2 fuse 30a Fan 2 relay Fan 3 relay Fog lps pcb relay From pwr/trn b relay (diagram 2 of 3) From pwr/trn d relay (diagram 2 of 3) Fuel injector Fuel/pump relay Hdm Heated oxygen sensor (ho2s) 1 Heated oxygen sensor (ho2s) 2 High beam pcb relay Horn pcb relay Ignition coil 1 Ignition coil 2 Ignition coil 3 Ignition coil 4 Ignition coil 5 Ignition coil 6 Ignition coil 8 Ignition coil7 Inj 1 fuse 20a Inj 2 fuse 20a J105 (ignition coil wiring harness, approximately 6 cm from x107) Mass air flow (maf)/ intake air temperature (iat) sensor Nca Pnk Valve lifter oil manifold (vlom) assembly Wiper pcb relay Wpr fuse 25a
POWER DOOR LOCKS Power Door Locks Wiring Diagram (1 of 2) for Buick LaCrosse CX 2009 List of elements for Power Door Locks Wiring Diagram (1 of 2) for Buick LaCrosse CX 2009: 66 (center rear of roof) (if equipped) radio rear window antenna (front of driver's door sill) g301 3.8l 5.3l Ajar sw sig Antenna sig Batt volt (+) Bcm class 2 Body control module (bcm) (left side of dash) C11 C4 x2 Class 2 ser data Coax Computer data lines system Door ajar indicator Dr ajar sw sig Dr open sw sig Driver door lock switch Driver information center (dic) display Front passenger door lock switch G101 (left front of engine compt) G202 (left side of dash) G301 (front of driver's door sill) G302 (front of front passenger's door sill) Ground Headlights system exterior lights system Hi beam relay Hood ajar switch (front of engine compt) Horn rly ctrl Horns system Hot at all times I/p fuse block (right side of dash) Ind ctrl Instrument panel cluster (ipc) Interior lights system J112 J211 J300 J303 J400 (w/ digital audio system) J501 J605 Lamp rly ctrl Lid ajar sw Lock Lock ctrl Lock sig Logic Nca Pnk Power distribution system Remote control door lock receiver (rcdlr) (right side of dash) Rfa ser data Rfa/mod fuse 10a Security indicator Security indicator lamp Sw sig Tan Trunk ajar indicator Trunk fuse 15a Underhood fuse block (right front strut tower) Unlock Unlock ctrl Unlock sig Volt (+) X3 c12 Power Door Locks Wiring Diagram (2 of 2) for Buick LaCrosse CX 2009 List of elements for Power Door Locks Wiring Diagram (2 of 2) for Buick LaCrosse CX 2009: 23 (body wiring harness, 26 cm from second breakout to g301) j315 (body wiring harness, 29 cm from second breakout to inline connector x311) Ajar Door lock actuator Door lock ajar indicator switch Door lock cylinder switch Door lock open indicator switch Driver door lock (driver's door) Front passenger door lock (front passenger's door) G301 (front of driver's door sill) G302 (front of front passenger's door sill) J303 J314 J406 J500 J604 Left rear door lock (left rear door) Lock Open Rear compartment lid latch (in trunk lid) Right rear door lock (right rear door) Tan Unlock
POWER MIRRORS Electrochromic Mirror Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Electrochromic Mirror Wiring Diagram for Buick LaCrosse CX 2009: 34 (front of front passenger's door sill) g302 Ambient light sensor ind Body control module (bcm) (left side of dash) Button back lighting Cellular micro phone signal Drain wire Emergency ind Emergency switch F1 x2 Ground Headlight sensor ind Hot at all times I/p fuse block (right side of dash) Inside rearview mirror (isrvm) J390 J394 (w/ sunroof) Keypad green led ind Keypad green led signal Keypad red led ind Keypad red led signal Keypad signal Logic Micro phone Nca Onstar ind Onstar keypad Onstar switch Phone ind Phone switch Power tops system S/roof fuse 20a Splice pack jx307 (body wiring harness, under passenger seat, at rear carpet) Vehicle communication interface module (vcim) (w/ onstar) (center of dash) W/ onstar Power Mirrors Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Power Mirrors Wiring Diagram for Buick LaCrosse CX 2009: 19 Defogger system Down Driver Driver outside rearview mirror E12 x2 G301 (front of driver's door sill) Hot at all times I/p fuse block (right side of dash) Illum Interior lights system J501 Left Left/ right Outside rearview mirror switch Passenger Passenger outside rearview mirror Pwr/mir fuse 10a Right Up/ down
POWER SEATS Driver Power Seat Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Driver Power Seat Wiring Diagram for Buick LaCrosse CX 2009: 19 D10 x2 Driver seat adjuster motors assembly (under driver's seat) Driver seat adjuster switch Forward Front down Front up Front vertical motor G301 (front of driver's door sill) Horizontal motor Hot at all times I/p fuse block (right side of dash) J330 Nca Pwr/seat circuit breaker 25a Rear down Rear up Rear vertical motor Rear- ward Tan Driver"s Lumbar Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Driver"s Lumbar Wiring Diagram for Buick LaCrosse CX 2009: 12 D10 x2 Driver seat lumbar motor (driver's seat back) Driver seat lumbar switch Forward G301 (front of driver's door sill) Hot at all times I/p fuse block (right side of dash) J330 J331 Pnk Pwr/seat circuit breaker 25a Rearward Heated Seats Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Heated Seats Wiring Diagram for Buick LaCrosse CX 2009: 41 Automatic a/c Body control module (bcm) (left side of dash) Class 2 serial data Data link connector (dlc) (left side of dash) Driver back heated seat element (driver's seat back) Driver cushion heated seat element (driver's seat cushion) Driver heated seat high indicator Driver heated seat low indicator Driver heated seat switch Driver's heated seat relay (under driver's seat) Element Front passenger heated seat switch G301 (front of driver's door sill) Heated Heated seat element Heated seat thermistor Hot at all times Htd/seat fuse 20a Hvac control module (center of dash) I/p fuse block (right side of dash) Inflatable restraint front passenger presence system (pps) module (under front passenger's seat) J330 J333 J379 Jx205 (clipped to knee bolster panel, right of data link connector) Logic Low reference Manual a/c Nca Passenger back heated seat element (front passenger's seat back) Passenger cushion heated seat element (front passenger's seat cushion) Passenger heated seat high indicator Passenger heated seat low indicator Passenger's heated seat relay (under front passenger's seat) Pnk Rly ctrl Seat Sensor sig Tan Thermistor X2 f9 Passenger"s Power Seat Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Passenger"s Power Seat Wiring Diagram for Buick LaCrosse CX 2009: 19 C10 x2 Forward Front down Front up Front vertical motor G301 (front of driver's door sill) Horizontal motor Hot at all times I/p fuse block (right side of dash) J333 Nca Passenger seat adjuster motor assembly (under front passenger's seat) Passenger seat adjuster switch Pwr/seat circuit breaker 25a Rear down Rear up Rear vertical motor Rear- ward Tan
POWER TOP/SUNROOF Power Top/Sunroof Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Power Top/Sunroof Wiring Diagram for Buick LaCrosse CX 2009: 17 Accessory voltage Close G302 (front of front passenger's door sill) Ground Hot w/ rap relay energized I/p fuse block (right side of dash) J390 J395 Open signal Open/vent Red S/roof fuse 20a Sunroof control module Sunroof motor/ actuator (front of sunroof module) Sunroof switch Sunroof switch close signal Sunroof switch low reference
POWER WINDOWS Power Windows Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Power Windows Wiring Diagram for Buick LaCrosse CX 2009: 26 (body wiring harness, 26 cm from breakout to g301) j350 Down Driver window motor (driver's door) Driver window switch Express down Front passenger window motor (front passenger's door) Front passenger window switch G301 (front of driver's door sill) G302 (front of front passenger's door sill) Hot w/ rap relay energized I/p fuse block (right side of dash) Illum Illumination Interior lights system J501 J605 Left rear window motor (left rear door) Left rear window switch Lock out switch Logic Pwr/wndw circuit breaker 25a Right rear window motor (right rear door) Right rear window switch Tan X1 f X2 e
RADIO Radio Wiring Diagram, with Amplifier for Buick LaCrosse CX 2009 List of elements for Radio Wiring Diagram, with Amplifier for Buick LaCrosse CX 2009: 89 (body wiring harness, 45 cm from breakout to rear compt courtesy lamp) (driver's side of headliner) radio antenna module (right side of dash) i/p fuse block 1-6 A10 A11 A12 Amplifier ctrl Antenna sig Audio amplifier (center of trunk) Audio common Audio common sig B10 B11 B12 Band Battery positive volt C10 C11 C12 Center i/p speaker Class 2 serial data Coax Computer data lines system Ctrl sig Drain wire Frt center out (+) Frt center out (-) G200 (left side of dash) G202 (left side of dash) Ground Ground distribution system Hot at all times I/p fuse block (right side of dash) I/p lamp sply volt Inflatable restraint steering wheel module coil (in steering column) Interior lights system J213 J360 (body wiring harness, 90 cm from breakout to rear compt courtesy lamp) J361 Left front door speaker Left front tweeter speaker Left rear speaker Lf low level sig (+) Lf low level sig (-) Lf spkr out (+) Lf spkr out (-) Lf tweeter out (+) Lf tweeter out (-) Lh audio sig (+) Lr low level sig (+) Lr low level sig (-) Lr spkr out (+) Lr spkr out (-) Mid range Mute Nca Pnk Radio Radio on sig Radio rear window antenna (center rear of roof) Rdo/ amp fuse 25a Rear sub out (+) Rear sub out (-) Rf low level sig (+) Rf low level sig (-) Rf spkr out (+) Rf spkr out (-) Rf tweeter out (+) Rf tweeter out (-) Rh audio sig (+) Right front door speaker Right front tweeter speaker Right rear speaker Right steering wheel control switch Rr low level sig (+) Rr low level sig (-) Rr spkr out (+) Rr spkr out (-) Satellite radio circuit Seek down Seek up Sub- woofer Tan Vehicle communication interface module (vcim) (if equipped) (center of dash) Vol down Vol up X275 X277 Radio Wiring Diagram, without Amplifier for Buick LaCrosse CX 2009 List of elements for Radio Wiring Diagram, without Amplifier for Buick LaCrosse CX 2009: 66 (driver's side of headliner) radio antenna module 1-6 A10 A11 A12 A4 x1 A6 remote radio ctrl sply volt a7 A9 x2 Antenna sig Audio common Audio common sig B10 B11 B12 Band Battery positive volt C10 C11 C12 Class 2 serial data Coax Computer data lines system Drain wire G200 (left side of dash) G202 (left side of dash) Ground Hot at all times I/p fuse block (right side of dash) I/p lamp sply volt Inflatable restraint steering wheel module coil (in steering column) Interior lights system J213 Left front door speaker Left front tweeter speaker Left rear speaker Lf speaker output (+) Lf speaker output (-) Lh audio sig (+) Lr speaker output (+) Lr speaker output (-) Mute Nca Pnk Radio Radio on sig Radio rear window antenna (center rear of roof) Rdo/ amp fuse 25a Rf speaker output (+) Rf speaker output (-) Rh audio sig (+) Right front door speaker Right front tweeter speaker Right rear speaker Right steering wheel control switch Rr speaker output (+) Rr speaker output (-) Satellite radio circuit Seek down Seek up Steering wheel ctrls sig Tan Vehicle communication interface module (vcim) (if equipped) (center of dash) Vol down Vol up X275 X277 Satellite Radio Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Satellite Radio Wiring Diagram for Buick LaCrosse CX 2009: 25 Antenna sig Aud common Audio common Bare Battery Cellular & digital radio antenna (digital radio antenna: center rear of roof) Coax Computer data lines system Digital radio receiver (left side of trunk) Drain wire F5 x2 G202 (left side of dash) Ground Hot at all times I/p fuse block (right side of dash) I/p fuse block (right side of dash) x1 J400 L aud sig (+) L audio sig (+) Nca R aud sig (+) R audio sig (+) Radio Rfa/mod fuse 10a Serial data
SHIFT INTERLOCK Ignition Lock Solenoid Wiring Diagram, with Console Shift for Buick LaCrosse CX 2009 List of elements for Ignition Lock Solenoid Wiring Diagram, with Console Shift for Buick LaCrosse CX 2009: 8 (left side of dash) g202 Hot at all times I/p fuse block (right side of dash) Ignition lock cylinder control actuator (top of steering column) J214 Nca Park brake switch (on park brake assembly) Prk/switch fuse 5a
3.8L VIN 2 3.8L VIN 2, Shift Interlock Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Shift Interlock Wiring Diagram for Buick LaCrosse CX 2009: 30 (left side of dash) body control module (bcm) (left side of dash) brake pedal position sensor (not used) w 10 volt ref A/t shift lock control solenoid (center console) Automatic transmission Automatic transmission internal mode switch (ims) Battery positive voltage Class 2 serial data Class 2 serial data x1 Column shift Computer data lines system Console shift G113 (lower left rear of engine, near starter) G202 (left side of dash) G301 (front of driver's door sill) Hazrd fuse 20a Hot at all times I/p fuse block (right side of dash) J101 J214 J303 Low ref P/n Powertrain control module (pcm) Stop lamp sw sig Switch sig a Switch sig b Switch sig c Switch sig p
5.3L VIN C 5.3L VIN C, Shift Interlock Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Shift Interlock Wiring Diagram for Buick LaCrosse CX 2009: 27 (left side of dash) body control module (bcm) (left side of dash) brake pedal position sensor (left side of engine) g115 10 volt ref Automatic transmission Automatic transmission internal mode switch (ims) Automatic transmission shift lock control solenoid (w/ console shift) (center console) Battery positive voltage Class 2 serial data Computer data lines system Engine control module (ecm) (left front of engine compt) G301 (front of driver's door sill) Hazrd fuse 20a Hi-spd gmlan serial data Hot at all times I/p fuse block (right side of dash) J125 J303 Low ref P/n Park/neutral signal Stop lamp sw sig Switch sig a Switch sig b Switch sig c Switch sig p Transmission control module (tcm) (left front of engine compt)
STARTING/CHARGING Charging Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Charging Wiring Diagram for Buick LaCrosse CX 2009: 40 (in i/p wiring harness, 21 cm from lamp assembly switch) (not used) a 10 volt ref 3.8l 5.3l Batt + Battery Battery current sensor (near battery) Body control module (bcm) (left side of dash) Charge indicator Clstr fuse 10a Computer data lines system Current sensor low ref Current sensor sig Driver information center (dic) display Ecm class 2 serial data Engine control module (ecm) (left front of engine compt) G102 (3.8l: near battery) G111 (3.8l: lower left rear of engine) G202 (left side of dash) Generator Generator field duty cycle sig Generator turn on sig Gnd Ground Hot at all times I/p class 2 serial data I/p fuse block (right side of dash) Instrument panel cluster (ipc) Interior lights system J204 J211 Jx205 (clipped to knee bolster panel, right of data link connector) Logic Pcm class 2 serial data Power distribution system Powertrain control module (pcm) Red Remote st sensor sig Starter motor
3.8L VIN 2 3.8L VIN 2, Starting Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Starting Wiring Diagram for Buick LaCrosse CX 2009: 48 (not used) 12-volt ref Acc Automatic transmission Automatic transmission internal mode Battery Battery positive Body control module (bcm) (left side of dash) C11 C12 Charging circuit Class 2 serial data Clstr fuse 10a Crank relay Crank voltage Driver information center (dic) display G101 (left front of engine compt) G102 (near battery) G111 (lower left rear of engine) G113 (lower left rear of engine, near starter) Ground distribution system Hood ajar switch (front of engine compt) Hood ajar switch sig Hot at all times Hot w/ ign 1 relay energized I/p fuse block (right side of dash) Ignition 1 voltage Ignition switch Instrument panel cluster (ipc) J101 J112 J200 Jx205 (clipped to knee bolster panel, right of data link connector) Lock Logic Pcm fuse 15 10a Pnk Power distribution system Powertrain control module (pcm) Red Run Start Start enable rly ctrl Starter fuse 33 40a Starter motor Switch (ims) Underhood fuse block (right front strut tower) W/ remote keyless entry
5.3L VIN C 5.3L VIN C, Starting Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Starting Wiring Diagram for Buick LaCrosse CX 2009: 46 12-volt ref Acc Automatic transmission Automatic transmission internal mode Battery Battery positive Body control module (bcm) (left side of dash) Charging circuit Class 2 serial data Clstr fuse 10a Crank voltage Driver information center (dic) display Ecm ign fuse 10a Engine control module (ecm) (left front of engine compt) G101 (left front of engine compt) G102 G111 G115 (left side of engine) Ground distribution system Hood ajar switch (front of engine compt) Hood ajar switch sig Hot at all times Hot w/ ign main pcb relay energized I/p fuse block (right side of dash) Ignition 1 voltage Ignition switch Instrument panel cluster (ipc) J112 J125 J200 Jx205 (clipped to knee bolster panel, right of data link connector) Lock Logic Park/neutral sig Pnk Red Run Start Start enable rly ctrl Starter motor Strtr fuse 40a Strtr relay Switch (ims) Underhood fuse block (right front strut tower) W/ remote keyless entry X100
SUPPLEMENTAL RESTRAINTS Supplemental Restraints Wiring Diagram (1 of 2) for Buick LaCrosse CX 2009 List of elements for Supplemental Restraints Wiring Diagram (1 of 2) for Buick LaCrosse CX 2009: 54 (in steering wheel) inflatable restraint steering wheel module (right siide of dash) inflatable restraint i/p module A10 A11 A12 A13 A14 A15 A16 A17 A18 Case ground G302 (front of front passenger's door sill) Ground I/p stage 1 high I/p stage 1 low I/p stage 2 high I/p stage 2 low Ignition 1 Inflatable restraint sensing & diagnostic module (sdm) (under front passenger's seat) Inflatable restraint steering wheel module coil (in steering column) L front end sens sig L pretensioner high L pretensioner low L seat belt sw L side impact sig Left inflatable restraint front end sensor (left front of engine compt) Left inflatable restraint roof rail module (if equipped) (mounted on left "c" pillar) Left inflatable restraint side impact (sis) sensor (if equipped) (driver's door) Lf roof rail mod high Lf roof rail mod low Low ref Occupant data link Pnk R front end sens sig R pretensioner high R pretensioner low R seat belt sw R side impact sig Red Rf roof rail mod high Rf roof rail mod low Right inflatable restraint front end sensor (at right front of engine compt) Right inflatable restraint roof rail module (if equipped) (mounted on right "c" pillar) Right inflatable restraint side impact (sis) sensor (if equipped) (front passenger's door) Sdm serial data Shorting bar Stage 1 Stage 2 Steer whl stage 1 high Steer whl stage 1 low Steer whl stage 2 high Steer whl stage 2 low Tan Supplemental Restraints Wiring Diagram (2 of 2) for Buick LaCrosse CX 2009 List of elements for Supplemental Restraints Wiring Diagram (2 of 2) for Buick LaCrosse CX 2009: 58 (body wiring harness, approximately 5 cm from breakout to g302) (w/ digital audio system s-band) j400 3.8l 5.3l A11 Air bag ind Air bag off ind Air bag on ind Air bag/ display fuse 10a B10 B11 Batt 1 fuse 50a Batt main 1 fuse 26 40a Battery b+ Case ground Class 2 (sdm) Class 2 serial data Data link connector (dlc) (left side of dash) Driver seat belt switch (driver's seat belt buckle) G202 (left side of dash) G301 (front of driver's door sill) G302 (front of front passenger's door sill) Ground Heated seat sig Hot at all times Hot in run or start Hot w/ ign main pcb relay energized Humidity sensor I/p fuse block (right side of dash) Ignition 1 Inflatable restraint front passenger presence system (pps) module (under front passenger's seat) Inflatable restraint front passenger presence system (pps) sensor (front passenger's seat bottom) Inflatable restraint passenger air bag on/off indicator Instrument panel cluster (ipc) J211 J300 J330 (w/ power seats) J333 (w/ power seats) Left seat belt pretensioner (under driver's seat) Logic Mass & position Nca Occupant data link Pass airbag off ind Pass airbag on ind Passenger seat belt indicator Passenger seat belt switch (front passenger's seat belt buckle) Pnk Red Rfa/mod fuse 10a Right seat belt pretensioner Seat belt ind Seats system Shorting bar Sir fuse 10a Sound systems Splice pack jx205 (clipped to knee bolster panel, right of data link connector) Temp sensor Underhood fuse block (right front strut tower)
TRANSMISSION
3.8L VIN 2 3.8L VIN 2, Transmission Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Transmission Wiring Diagram for Buick LaCrosse CX 2009: 67 (not used) (throttle pos) (top of engine) engine coolant temperature (ect) sensor 1-2 shift sol 1-2 shift solenoid (ss) valve 2-3 shift sol 2-3 shift solenoid (ss) valve 5 volt ref 1 A/t fluid pressure (tfp) manual valve position switch A/t fluid temp- erature (tpt) sensor A/t input shaft speed (iss) speed Acc At iss sig high At iss sig low Automatic transmission Automatic transmission internal mode switch (ims) Battery Class 2 serial data Code a Code b Code c Computer data lines system Ect sensor sig G113 (lower left rear of engine near starter) Ground Hot at all times Hot w/ ign 1 relay 37 energized Ignition 1 Ignition 3 Ignition switch Instrument panel cluster (ipc) J101 J115 Lock Low ref Manifold absolute pressure (map) sensor (top right of intake manifold) Map sensor sig Parity Pc sol high Pc sol low Pcm fuse 15 10a Pcm/ etc fuse 16 15a Pnk Power distribution system Powertrain control module (pcm) Pressure control (pc) solenoid valve Red Red a Run Start Tan Tan b Tcc sol Tcc sw sig Tft sensor sig Throttle actuator control (tac) module (at throttle body) Torque converter clutch (tcc) solenoid valve Tr sig a Tr sig b Tr sig c Tr sig p Trans sol fuse 21 10a Uart data Underhood fuse block (right front strut tower) Vehicle speed sensor (vss) (right side of transmission) Vss sig high Vss sig low
5.3L VIN C 5.3L VIN C, Transmission Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Transmission Wiring Diagram for Buick LaCrosse CX 2009: 71 1-2 shift solenoid (ss) valve 1-2 sol vlv ctrl 10 volt ref 2-3 shift solenoid (ss) valve 2-3 sol vlv ctrl Acc Acc volt Automatic transmission Automatic transmission fluid pressure manual valve position switch Automatic transmission fluid temperature (tft) sensor Automatic transmission input shaft speed (iss) sensor Automatic transmission internal mode switch (ims) Batt positive volt Body control module (bcm) (left side of dash) Brake pedal position sensor (left side of dash) Class 2 Code a Code b Code c Computer data lines system Emc/tcm fuse 8 15a Engine control module (ecm) (left front of engine compt) G115 (left side of engine) Ground Hot at all times Hot w/ ignition main pcb relay energized Ign 1 volt Ign 3 voltage Ignition switch Instrument panel cluster (ipc) Iss high sig Iss low sig J115 Lock Low ref Not used P/n P/n signal Parity Pc sol vlv ctrl Pc sol vlv hi ctrl Pnk Power distribution system Pressure control (pc) solenoid valve Red Run Serial data bus Serial data bus + Serial data bus - Start Stop lp sw Stop lp sw sig Sw sig Tan Tcc pwm sol ctrl Tcc rel sw sig Tcc release switch Tft sens sig Torque converter clutch (tcc) solenoid valve Trans fuse 10a Trans range sig a Trans range sig b Trans range sig c Trans range sig p Transmission control module (tcm) (left front of engine compt) Underhood fuse block (right front strut tower) Vehicle spd sig Vehicle speed sensor (vss) assembly (right side of transmission) Vss Vss hi sig Vss low sig
TRUNK, TAILGATE, FUEL DOOR Trunk Release Wiring Diagram for Buick LaCrosse CX 2009 List of elements for Trunk Release Wiring Diagram for Buick LaCrosse CX 2009: 28 Battery Body control module (bcm) (left side of dash) Class 2 Class 2 serial Class 2 serial data Clstr fuse 10a Computer data lines system Door locks system Driver information center (dic) Drv dr lk sw unlock sig E8 x1 G200 (left side of dash) G302 (front of front passenger's door sill) Ground Hazrd fuse 20a Hot at all times I/p fuse block (right side of dash) Instrument panel cluster (ipc) J406 Lid ajar switch Logic Pas dr lk sw unlk sig Pnk Rear compartment lid latch (in trunk lid) Remote control door lock receiver (rcdlr) (right side of dash) Serial Trunk ajar ind Trunk release control x2
WARNING SYSTEMS Warning Systems Wiring Diagram (1 of 2) for Buick LaCrosse CX 2009 List of elements for Warning Systems Wiring Diagram (1 of 2) for Buick LaCrosse CX 2009: 50 (front of driver's door sill) g301 3.8l 5.3l Ajar Auto Battery Battery positive volt Bcm class 2 serial data Body control module (bcm) (left side of dash) Chmsl/ bkup fuse 15a Door lock ajar indicator switch Dr/lck trunk fuse 15a Driver door lock (driver's door) G102 (3.8l: near battery) G111 (3.8l: lower left rear of engine) G200 (left side of dash) G201 (center of dash) G202 (left side of dash) G301 (front of driver's door sill) Ground Hazrd fuse 20a Head Headlamp switch Hot at all times I/p fuse block (right side of dash) Ignition switch Int/ illum fuse 10a J214 J303 J500 Key in ign sw sig Key in ignition switch Left Left rear door lock (left rear door) Left turn sig sw sig Lf dr ajar sw sig Lr dr ajar sw sig Off Park Park brake sw sig Park brake switch (on park brake assembly) Park lamp sw on sig Rf dr ajar sw sig Right Right turn sig sw sig Rr dr ajar sw sig Turn signal/ multi-function switch Underhood fuse block (right front strut tower) Washer/ rvc fuse 6 15a Wsw/rvc fuse 15a Warning Systems Wiring Diagram (2 of 2) for Buick LaCrosse CX 2009 List of elements for Warning Systems Wiring Diagram (2 of 2) for Buick LaCrosse CX 2009: 60 (uplevel) message center 3.8l 5.3l A11 A14 A16 Abs/tcs class 2 serial data Air bag/ display fuse 10a Ajar Bcm class 2 serial data Brake fluid level switch (on brake fluid reservoir) Brake ind Brake warning ind ctrl Check tire pressure service tire monitor Class 2 Class 2 a1 Digital radio receiver (if equipped) (left side of trunk) Door lock ajar indicator switch Driver information center (dic) (if equipped) Driver seat belt buckle Front passenger door lock (front passenger's door) G202 (left side of dash) G301 (front of driver's door sill) G302 (front of front passenger's door sill) Hot w/ ign 1 relay energized Hot w/ ignition main pcb relay energized I/p fuse block (right side of dash) Ign Inflatable restraint passenger air bag on/off indicator Inflatable restraint sensing & diagnostic module (sdm) (under front passenger's seat) Instrument panel cluster (ipc) Ipc class 2 serial data Ipc/bcm class 2 serial data J211 J330 (w/ power seats) J333 (w/ power & heated seats) J406 J604 Left seat belt sw Left turn signal ind Logic Low tire pressure ind Message request Nca Pass seat belt ind Passenger seat belt buckle Pnk Radio Red Remote control door lock receiver (rcdlr) (right side of dash) Rfa class 2 serial data Right rear door lock (right rear door) Right seat belt sw sig Right turn signal ind Sdm class 2 serial data Seat belt ind Serial data Sir fuse 9 10a Splice pack jx205 (clipped to knee bolster panel, right of data link connector) Underhood fuse block (right front strut tower)
WIPER/WASHER
3.8L VIN 2 3.8L VIN 2, Wiper/Washer Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 3.8L VIN 2, Wiper/Washer Wiring Diagram for Buick LaCrosse CX 2009: 63 A14 A15 B14 B3 x1 Battery Body control module (bcm) (left side of dash) C14 C15 Class 2 serial data D5 x3 Delay switch Driver information center (dic) E14 E15 F10 F11 F12 F14 F6 x2 G100 (right front of engine compt) G113 (lower left rear of engine, near starter) G14 G15 G200 (left side of dash) Ground High Hot at all times Ign Instrument panel cluster (ipc) Int J101 J124 J213 Jx205 (clipped to knee bolster panel, right of data link connector) Logic Low Low wash indicator Low washer fluid ind sig Mist Off Park sw sig Park switch Pnk Red Tan Turn signal/ multi-function switch Underhood fuse block (right front strut tower) Washer pump ctrl Washer switch Washer/ rvc fuse 6 15a Windshield washer fluid level switch (in washer fluid reservoir) Windshield washer pump (in washer fluid reservoir) Windshield washer sw sig x3 Windshield wiper motor (left rear of engine compt) Windshield wiper sw hi sig Windshield wiper sw high sig Windshield wiper sw low sig Windshield wiper switch Wiper hi relay Wiper relay Wiper rly ctrl Wiper/ ws fuse 5 25a X2 f4
5.3L VIN C 5.3L VIN C, Wiper/Washer Wiring Diagram for Buick LaCrosse CX 2009 List of elements for 5.3L VIN C, Wiper/Washer Wiring Diagram for Buick LaCrosse CX 2009: 50 A1 x2 Battery Body control module (bcm) (left side of dash) C2 x1 Class 2 serial data Delay switch Driver information center (dic) G100 (right front of engine compt) G113 (left rear of engine) G200 (left side of dash) Ground High Hot at all times Ign Instrument panel cluster (ipc) Int J101 J124 J213 Jx205 (clipped to knee bolster panel, right of data link connector) K3 x3 Logic Low Low wash indicator Low washer fluid ind sig Mist Off Park sw sig Park switch Pnk Red Tan Turn signal/ multi-function switch Underhood fuse block (right front strut tower) Washer pump ctrl Washer switch Windshield washer fluid level switch (in washer fluid reservoir) Windshield washer pump (in washer fluid reservoir) Windshield washer sw sig x3 Windshield wiper motor (left rear of engine compt) Windshield wiper sw hi sig Windshield wiper sw high sig Windshield wiper sw low sig Windshield wiper switch Wiper hi pcb relay Wiper pcb relay Wiper rly ctrl Wpr fuse 25a Wsw/ rvc fuse 15a X2 k4
