ENGINE PERFORMANCE – Buick LaCrosse CX 2005 – SYSTEM WIRING DIAGRAMS

ENGINE PERFORMANCE

3.6L VIN 7

3.6L VIN 7, Engine Performance Wiring Diagram (1 of 4) for Buick LaCrosse CX 2005

List of elements for 3.6L VIN 7, Engine Performance Wiring Diagram (1 of 4) for Buick LaCrosse CX 2005:

• (bottom of oil pan) engine oil level/temperature sensor
• (eng harn, 15.5 in from ecm breakout) s120
• (left front of engine block) engine oil pressure sensor
• +5v
• +5v ref
• Charging system
• Ckp hi
• Ckp sens lo
• Cmp sig
• Cmp sol ctrl
• Crankshaft position sensor (right rear of engine block)
• Drain
• Ect sig
• Engine control module (top of engine)
• Evap sol ctrl
• Fuel injectors
• G103 (even bank cylinder head)
• Gen fdc sig
• Gen to sig
• Heated oxygen sensor 1 (rear of cylinder head in exhaust manifold)
• Heated oxygen sensor 2 (in exhaust, rear of catalytic converter)
• Ho2s hi sig
• Ho2s lo ctrl
• Ho2s pmp ct
• Ic 1 sig
• Ic 2 ctrl
• Ic 3 ctrl
• Ic 4 sig
• Ic 5 ctrl
• Ic 6 ctrl
• Inj 1 ctrl
• Inj 2 ctrl
• Inj 3 ctrl
• Inj 4 ctrl
• Inj 5 ctrl
• Inj 6 ctrl
• Knock sensor bank 1 (right side of engine)
• Knock sensor bank 2 (left side of enigne block)
• Ks 1 sig
• Ks 2 sig
• Low ref
• Map sig
• Nca
• Oil lev sig
• Oil pres sig
• Oil tmp sig
• Pnk
• Pnk d
• S104
• S108
• Tac mtr ctrl
• Tan
• Tp sig
• Tp2 sig

3.6L VIN 7, Engine Performance Wiring Diagram (2 of 4) for Buick LaCrosse CX 2005

List of elements for 3.6L VIN 7, Engine Performance Wiring Diagram (2 of 4) for Buick LaCrosse CX 2005:

• (engine harn, 2 in from ecm breakout)
• A11
• C11
• Cnstr fuse 10a
• D11
• Elek ign fuse 15a
• Emis- sion fuse 10a
• Etc fuse 17 15a
• F12
• Fuel inj fuse 15a
• Fuel pp fuse 22 15a
• Fuel pump relay
• G115
• G115 (mounted to bank 1 cylinder head)
• G130
• G131
• Hot at all times
• Hot in run or start
• I/p fuse block (behind right side of dash)
• Ign 1 relay
• Ignition coil 1
• Ignition coil 2
• Ignition coil 3
• Ignition coil 4
• Ignition coil 5
• Ignition coil 6
• Nca
• O2 ssr fuse 15a
• P/train relay
• Pcm fuse 15 10a
• Pcm/etc fuse 16 15a
• Pnk
• S106
• S110
• S130
• S131
• S132
• S133
• S146
• Spark plug
• Tan
• Under- hood fuse block (mounted to right strut tower)

3.6L VIN 7, Engine Performance Wiring Diagram (3 of 4) for Buick LaCrosse CX 2005

List of elements for 3.6L VIN 7, Engine Performance Wiring Diagram (3 of 4) for Buick LaCrosse CX 2005:

• (engine harn, 13.5 cm from ecm breakout)
• (front of left cyl head)
• (front of right cyl head)
• +5v
• A/c refrigerant pressure sensor (on accumulator)
• Camshaft position actuator solenoid (exhaust bank 1)
• Camshaft position actuator solenoid (exhaust bank 2)
• Camshaft position actuator solenoid (intake bank 1)
• Camshaft position actuator solenoid (intake bank 2)
• Camshaft position sensor (exhaust bank 1)
• Camshaft position sensor (intake bank 1)
• Camshaft position sensor (intake bank 2)
• Engine coolant temperature sensor (left side of engine block)
• Evap canister purge solenoid (top rear of engine)
• Low ref
• Manifold absolute pressure sensor (in air intake tube)
• Mass airflow/ intake air temperature sensor (at rear of engine)
• Pnk
• S119
• S121
• Signal
• Tan
• Throttle actuator control module (at throttle body)

3.6L VIN 7, Engine Performance Wiring Diagram (4 of 4) for Buick LaCrosse CX 2005

List of elements for 3.6L VIN 7, Engine Performance Wiring Diagram (4 of 4) for Buick LaCrosse CX 2005:

• (in fuel tank) fuel tank pressure sensor
• (mounted to bank 1 cylinder head)
• (mounted to c1 right strut tower)
• (mounted to right strut c1 tower)
• +5v ref
• +5v ref a
• +5v ref c
• A/c ref pres
• A/c system
• Acc
• Acc volt
• Accelerator pedal
• Anti-lock brake system
• App sens 2 sig
• App sens sig
• Automatic transmission manual shift shaft switch assembly
• B12
• Battery +
• Body control module (behind left side of steering col)
• Cc sw sig
• Class 2 data
• Clu rly ctrl
• Computer data lines system
• Cooling fans system
• Cruise control system
• D10
• D12
• Delv torque sig
• E11
• Eng spd sig
• Engine control module (top of engine)
• Evap canister vent solenoid (behind wheelwell)
• Evap sol ctrl
• Fan rly ctrl
• Fuel lev sig
• Fuel level sensor
• Fuel pump/ sender assembly
• G115
• G302
• Gmlan bus
• Ho2s hi sig
• Ho2s lo ctrl
• Ho2s lo sig
• Hot at all times
• I/p fuse block (behind left side of dash)
• I/p fuse block (behind right c1 side of dash)
• Iat sig
• Ign 1 volt
• Ignition switch
• Instrument panel cluster
• Lan bus +
• Lan bus -
• Lock
• Logic
• Low ref
• Maf sig
• Main rly ctrl
• Malfunction indicator lamp
• Mil ctrl
• Navigation system
• P/n sig
• Pnk
• Position sensor (under left side of dash)
• Req torq sig
• Rly coil ctrl
• Rly ctrl
• Run
• S118 (12 in from under- hood fuse block)
• Ser data bus
• Start
• Starting system
• Stop lamp sw sig
• Stop lp sw
• Tan
• Tank pres sig
• Transmission control module
• Underhood fuse block
• Underhood fuse block (on right strut tower)
• Underhood fuse block c1 (mounted to right strut tower)
• Vss

3.8L VIN 2

3.8L VIN 2, Engine Performance Wiring Diagram (1 of 5) for Buick LaCrosse CX 2005

List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (1 of 5) for Buick LaCrosse CX 2005:

• (below power steering pump) engine oil pressure switch
• (fuel injector harn, on top of engine)
• (on throttle body assembly) throttle position sensor
• (on transaxle stud, near starter) g113
• (pins 62-72 not used)
• (top right rear of engine, near throttle body) exhaust gas recirculation valve
• 5 volt ref
• Air sol ctrl
• Cmp sensor
• Ect sensor sig
• Egr pos sig
• Egr sol high
• Egr sol low
• Engine coolant temperature sensor (vin 2: top right of intake manifold) (vin 4: top left rear of engine)
• Engine oil pressure switch (below pwr steering pump)
• Evap canister purge solenoid (below throttle body)
• Evap purge sol
• Fuel inj 1
• Fuel inj 2
• Fuel inj 3
• Fuel inj 4
• Fuel inj 5
• Fuel inj 6
• Fuel injectors
• G113 (on transmission stud, near starter)
• Gen field
• Gen on sig
• Generator
• Ground
• Heated oxygen sensor (ho2s) 1 (in right bank exhaust manifold)
• Ho2s heater 1
• Ho2s sig high
• Ho2s sig low
• Ic timing ctrl
• Ic timing sig
• Knock sensor bank 1 (right side of engine, above starter)
• Knock sensor bank 2 (right side of engine, below exhst 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 (left front side of engine compt, in air cleaner assembly)
• Red
• S101
• S109
• Spark timing
• Tan
• Uart data

3.8L VIN 2, Engine Performance Wiring Diagram (2 of 5) for Buick LaCrosse CX 2005

List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (2 of 5) for Buick LaCrosse CX 2005:

• (front of engine) camshaft position sensor
• (front of engine) crankshaft position sensor
• (icm harn, top of engine, near icm)
• (lower left side of engine block)
• 2ndary uart
• 5 volt ref
• A11
• Aap sensor 1
• Accelerator pedal position switch (under left side of dash)
• App sensor 2
• Body control module
• C11
• Elek ign fuse 24 15a
• Etc fuse 17 15a
• From p/train relay (diagram 4 of 5)
• Fuel inj fuse 20 15a
• G112
• G113 (on transaxle stud, near starter)
• Ground
• Hot in run or start
• Ign 1 volt
• Ignition control module (icm) (top left front of eng)
• Low ref
• Pnk
• Primary uart
• S101
• S102
• S144
• S145
• Secondary air injection control solenoid valve/pressure sensor (sulev) (right side of engine)
• Secondary air injection solenoid relay (sulev)
• Spark plugs
• Stop lamp
• Stop lamp switch signal
• Tan
• Throttle actuator control module (on throttle body)
• Trans sol fuse 21 10a
• Underhood fuse block (mounted to right strut tower)
• Vehicle spd

3.8L VIN 2, Engine Performance Wiring Diagram (3 of 5) for Buick LaCrosse CX 2005

List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (3 of 5) for Buick LaCrosse CX 2005:

• 1-2 shift solenoid
• 2-3 shift solenoid
• A/t fluid temp sensor
• Air pres sens
• At iss sig
• Automatic transaxle
• Boost sol
• G113 (on transaxle stud, near starter)
• Ho2s heater 2
• Ho2s sig high 2
• Ho2s sig low 2
• Iat sensor sig
• Input shaft speed sensor
• Low ref
• Maf sensor sig
• Oss sig
• Pc sol
• Pnk
• Powertrain control module (left front side of engine compt, in air cleaner assembly)
• Pressure control solenoid
• Red
• S101
• Shift sol a
• Shift sol b
• Tan
• Tcc release switch
• Tcc sol
• Tcc sw sig
• Tft sensor sig
• Torque converter clutch solenoid
• Tr sw a
• Tr sw b
• Tr sw c
• Tr sw p
• Trans- mission internal mode switch
• Vehicle speed sensor (lower right side of engine compt, on transaxle)

3.8L VIN 2, Engine Performance Wiring Diagram (4 of 5) for Buick LaCrosse CX 2005

List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (4 of 5) for Buick LaCrosse CX 2005:

• (in air cleaner duct)
• (w/ stabilitrak)
• (w/o stabilitrak)
• Air pump fuse 25 50a
• Cnstr fuse 10a
• D11
• Electronic brake control module (left side of engine compt)
• Emission fuse 12 10a
• Evap canister vent solenoid (behind left rear wheelwell)
• F12
• Fuel pp fuse 22 15a
• Fuel pp relay
• G113 (on transaxle stud, near starter)
• G115 (on transmission stud, right of starter)
• Heated oxygen sensor (ho2s) 2 (rear of catalytic converter)
• Hot at all times
• I/p fuse block (behind right side of dash)
• Iat
• Intake air temperature/ mass air flow sensor
• Maf
• Nca
• O2 ssr fuse 14 15a
• P/train relay
• Pnk
• Red
• S114
• S117
• Secondary air injection pump (sulev) (left rear of engine)
• Secondary air injection pump relay (sulev) (on left front frame rail)
• Tan
• To p/train fuses (diagram 2 of 5)
• Underhood fuse block (mounted to right strut tower)

3.8L VIN 2, Engine Performance Wiring Diagram (5 of 5) for Buick LaCrosse CX 2005

List of elements for 3.8L VIN 2, Engine Performance Wiring Diagram (5 of 5) for Buick LaCrosse CX 2005:

• (left side of dash)
• (left side of engine compt) a/c refrigerant pressure sensor
• (right door sill, forward of right front seat) g302
• (right side
• 5 volt ref
• A/c clutch relay
• A/c press sig
• A/c system
• A12
• A7 c2
• Acc
• B12
• Battery
• C1 d8
• C12
• Class 2 data
• Clstr fuse 10a
• Cooling fans system
• Cruise control system
• Cruise sig
• D1 c1
• D10
• D12 c2
• Data link connector (under left side of dash, right of steering column)
• E11
• Eng speed sig
• Evap vent sol
• F c405
• F11
• Fuel level sig
• Fuel pump & sender assembly
• Fuel pump relay
• Fuel tank
• Fuel tank press
• Fuel tank pressure sensor
• G202
• High fan
• Hot at all times
• Hot in run or start
• I/p fuse block (behind right side of dash)
• Ignition 1
• Ignition 3
• Ignition switch
• Instrument panel cluster
• Lock
• Low fan
• Low ref
• Malfunction indicator lamp (mil)
• Mil control
• Pcm fuse 15 10a
• Pcm relay
• Pcm/etc fuse 16 15a
• Pnk
• Powertrain control module (left front side of engine compt, in air cleaner assembly)
• Relay ctrl
• Run
• S211
• Splice pack sp205
• Start
• Starter enable
• Starting system
• Stop lamp sw
• Underhood fuse block (mounted to right strut tower)
• Upper left footwell)
• Vehicle speed sig