All Wiring Diagrams for Buick Century Custom 2005 model

AIR CONDITIONING

Automatic A/C Wiring Diagram (1 of 2) for Buick Century Custom 2005

List of elements for Automatic A/C Wiring Diagram (1 of 2) for Buick Century Custom 2005:

• (behind right side of dash compt) g200
• (i/p wiring harness, 18 cm from radio breakout)
• (i/p wiring harness, 4 cm left of hvac control module breakout)
• (i/p wiring harness, behind center of dash, 4 cm from radio breakout)
• (i/p wiring harness, right side of steering column, 19 cm from radio breakout)
• (lower center of dash) hvac control module
• (on right side of hvac module) vacuum control assembly
• 5 v ref
• A/c solenoid
• Air temp dr ctrl
• Ambient outside air temperature sensor (front of radiator support)
• Ambient temp sig
• Battery
• Bi-level solenoid
• Blower motor (behind right side of dash, in hvac module)
• Blower motor control processor (behind right side of dash, in hvac module)
• Blower speed ctrl
• C10
• C11
• C12
• C13
• C14
• C15
• C16
• Class 2 serial data
• Cntrl in
• D10
• D11
• D12
• D13
• D14
• D15
• D16
• Data link connector (dlc) (under left side of dash, right of steering column)
• Def mode sol ctrl
• Defogger system
• Defrost solenoid
• Gnd
• Heater solenoid
• High blower fuse 30a
• Hot at all times
• Hot in run
• Hvac fuse 10a
• I/p fuse block (behind right side of dash, in right door opening)
• Ign 3 voltage
• Inside air temperature sensor (at left side of dash, below instrument cluster)
• Inside temp sig
• Interior lights system
• Ip dim sw sig
• Left air temperature actuator (left side of hvac module)
• Low ref
• Lt temp dr pos
• Lwr mode sol ctrl
• Mix-blnd sol ctrl
• Radio, hvac, rfa, cluster aldl fuse 15a
• Recirc sol ctrl
• Recirc solenoid
• Red
• Right air temperature actuator (right side of hvac module)
• Rr defog rly ctrl
• Rt temp dr ctrl
• Rt temp dr pos
• S202
• S230
• S231 (i/p wiring harness, 33 cm from hvac control module connector)
• S233
• S258
• Solid state
• Sp205 (behind data link connector)
• Sun load sig
• Sunload sensor (on top right side of dash, near defogger outlet)
• Tan
• Upper mode sol ctrl

Automatic A/C Wiring Diagram (2 of 2) for Buick Century Custom 2005

List of elements for Automatic A/C Wiring Diagram (2 of 2) for Buick Century Custom 2005:

• (cooling fan jumper harness, 19.5 cm from right connector to engine cooling fan motor)
• (cooling fan jumper harness, 20 cm from left connector to engine cooling fan motor)
• (engine wiring harness, front of engine compt, 4 cm from c105 breakout) s105
• (engine wiring harness, left side of engine compt, 4 cm from powertrain control module breakout)
• (fuel injector jumper harness, midway between fuel inj no 3 breakout & map sensor breakout)
• (top left side of engine, below throttle body)
• 5 volt ref
• A/c compressor clutch (on front of a/c compressor)
• A/c clu diode
• A/c clutch fuse 23 10a
• A/c clutch relay 15
• A/c press signal
• A/c refrigerent pressure sensor (at left front strut tower, on a/c liquid line)
• A10
• A11
• C11
• Class 2 ser data
• Clutch rly ctrl
• Cool fan 1 fuse 6 25a
• Cool fan 2 fuse 24 15a
• Cool fan 1 relay
• Cool fan 2 relay
• Cool fan 3 relay
• E10
• Ect ground
• Ect signal
• Engine controls system
• Engine coolant temperature (ect) sensor
• F12
• G113 (lower right front of engine, on transaxle stud, left of starter)
• Hi spd rly ctrl
• Hot at all times
• Ign main relay
• Left cooling fan diode
• Left cooling fan motor (on left side of radiator)
• Lo spd rly ctrl
• Low ref
• Nca
• P10
• P11
• Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
• R10
• R11
• Right cooling fan diode
• Right cooling fan motor (on right side of radiator)
• S101
• S102
• S103
• S104
• S121
• S167
• T10
• T11
• U11
• Underhood fuse block (mounted to right front strut tower)
• V10
• V11

Compressor Wiring Diagram for Buick Century Custom 2005

List of elements for Compressor Wiring Diagram for Buick Century Custom 2005:

• (i/p wiring harness, 18 cm from radio breakout)
• (lower right front of engine, on transaxle stud, left of starter)
• (w/ manual a/c)
• 5 volt ref
• A/c clu diode
• A/c clutch fuse 23 10a
• A/c clutch relay 15
• A/c compressor clutch (on front of a/c compressor)
• A/c press signal
• A/c refrigerent pressure sensor (at left front strut tower, on a/c liquid line)
• A/c request
• Automatic a/c
• Battery
• C11
• C12
• Class 2 ser data
• Clutch request
• Clutch rly ctrl
• D12
• Engine controls system
• G113
• G200 (behind right side of dash compt)
• Ground
• Hot at all times
• Hot in run
• Hvac control module (lower center of dash)
• Hvac fuse 10a
• I/p fuse block (behind right side of dash, in right door opening)
• Ign main relay
• Ignition
• Low ref
• Manual a/c
• Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
• Radio, hvac, rfa clstr, aldl fuse 15a
• S105 (engine wiring harness, front of engine compt, 4 cm from c105 breakout)
• S167 (left side of engine compt, 4 cm from powertrain control module breakout)
• S202 (i/p wiring harness, right side of steering column, 19 cm from radio breakout)
• S230
• S233 (i/p wiring harness, behind center of dash, 4 cm from radio breakout)
• Serial data
• Sp205 (behind data link connector)
• Underhood fuse block (mounted to right front strut tower)
• W/ automatic a/c

Manual A/C Wiring Diagram for Buick Century Custom 2005

List of elements for Manual A/C Wiring Diagram for Buick Century Custom 2005:

• (behind right side of dash compt) g200
• (cooling fan jumper harness, 19.5 cm from right connector to engine cooling fan motor)
• (cooling fan jumper harness, 20 cm from left connector to engine cooling fan motor)
• (engine wiring harness, front of engine compt, 4 cm from c105 breakout)
• (engine wiring harness, left side of engine compt, 4 cm from powertrain control module breakout)
• (fuel injector jumper harness, midway between fuel inj no 3 breakout & map sensor breakout) s121
• (i/p wiring harness, 18 cm from radio breakout)
• (i/p wiring harness, behind center of dash, 4 cm from radio breakout)
• (left side of hvac module) left air temperature actuator
• (on left side of radiator)
• (on right side of radiator)
• (top left side of engine, below throttle body)
• +5v reference
• A/c compressor clutch (on front of a/c compressor)
• A/c clu diode
• A/c clutch fuse 10a
• A/c clutch relay 15
• A/c press signal
• A/c refrigerant pressure sensor (at left front strut tower, on a/c liquid line)
• A/c request sig
• A10
• A11
• Battery
• Blower motor (behind right side of dash, in hvac module)
• Blower motor resistor assembly (under right side of dash, in right side of hvac module)
• C11
• Clutch request
• Comp control
• Cool fan 1 fuse 25a
• Cool fan 2 fuse 15a
• Cool fan 1 relay
• Cool fan 2 relay
• Cool fan 3 relay
• Defogger on
• Defogger system
• Drvr temp ctrl
• E10
• Ect gnd
• Ect signal
• Engine controls system
• Engine coolant temperature (ect) sensor
• F12
• Fan off input
• G200 (behind right side of dash compt)
• Gnd
• Ground
• High blower fuse 30a
• High blower relay
• High speed
• Hot at all times
• Hot in run
• Hvac control module (lower center of dash)
• Hvac fuse 10a
• I/p fuse block (behind right side of dash, in right door opening)
• Ign
• Ign main relay
• Ignition
• Interior lights
• Interior lights system
• Lamp dim sig
• Left cooling fan diode
• Left cooling fan motor
• Low blower fuse 20a
• Low reference
• Low speed
• Nca
• Off
• P10
• P11
• Pass temp ctrl
• Pos
• Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
• R10
• R11
• Radio, hvac, rfa clstr, aldl fuse 15a
• Right air temperature actuator (right side of hvac module)
• Right cooling fan diode
• Right cooling fan motor
• S101
• S102
• S103
• S104
• S105
• S167
• S230
• S233
• T10
• T11
• Tan
• Thermal breakers
• U11
• Underhood fuse block (mounted to right front strut tower)
• V10
• V11

ANTI-LOCK BRAKES

Anti-lock Brakes Wiring Diagram for Buick Century Custom 2005

List of elements for Anti-lock Brakes Wiring Diagram for Buick Century Custom 2005:

• A10
• A11
• Abs fuse 1 60a
• Abs fuse 10a
• Anti-lock brake ind
• B10
• B11
• B12
• Battery
• Body control module (bcm) (behind left side of dash left of steering column)
• Brake fluid level switch (in brake fluid reservoir)
• Brake ind
• Brake pressure modulator valve (bpmv)
• C10
• C11
• Cluster fuse 10a
• Data link connector (dlc) (under left side of dash, right of steering column)
• Electronic brake control module (ebcm) (at left side of engine compartment, near strut tower)
• G113 (lower right front of engine, on transaxle stud, left of starter)
• G171 (left side of engine compartment, below master cylinder)
• G203 (below dash, right side of steering column)
• Ground
• Hot at all times
• Hot in run or start
• Hot in run, bulb test or start
• I/p fuse block (behind right side of dash, in right door opening)
• Ignition
• Instrument panel cluster (ipc)
• Left front wheel spd (hi)
• Left front wheel spd (lo)
• Left front wheel speed sensor (wss) (on left front wheel hub assembly)
• Left rear wheel spd (hi)
• Left rear wheel spd (lo)
• Left rear wheel speed sensor (wss) (on left rear wheel hub assembly)
• Logic
• Low trac ind
• Nca
• Parking brake switch
• Pnk
• Powertrain control module (pcm) (left front side of engine compartment, in air cleaner assembly)
• Pump motor
• Red
• Right front wheel spd (hi)
• Right front wheel spd (lo)
• Right front wheel speed sensor (wss) (on right front wheel hub assembly)
• Right rear wheel spd (hi)
• Right rear wheel spd (lo)
• Right rear wheel speed sensor (wss) (on right rear wheel hub assembly)
• S205 (i/p wiring harness, below dash, near c201, 14 cm from g201 breakout)
• S211
• Serial data signal
• Sp205 (behind data link connector)
• Stop lamp sw out
• Stop lamp switch (on brake pedal support bracket)
• Stop lamps fuse 15a
• Tan
• Trac off ind
• Underhood fuse block (mounted to right front strut tower)
• Vent tube

ANTI-THEFT

Anti-theft Wiring Diagram for Buick Century Custom 2005

List of elements for Anti-theft Wiring Diagram for Buick Century Custom 2005:

• B10
• B12
• Batt
• Bcm gnd
• Bcm pwr fuse 10a
• Body control module (bcm) (behind left side of dash, left of steering column)
• Cluster fuse 10a
• Crank fuse 2 40a
• Crank relay
• Crank signal bcm, cluster fuse 10a
• Crank voltage
• Data link connector (dlc) (under left side of dash, right of steering column)
• F10
• G203 (below dash, right side of steering column)
• Hot at all times
• Hot in run or start
• Hot in run, bulb test or start
• Hot in start
• Hot in unlock, run or start
• I/p fuse block (behind right side of dash, in right door opening)
• Ign
• Ign 0
• Ign 0: cluster pcm & bcm fuse 10a
• Ign key sig
• Ign ref lo
• Ignition lock cylinder
• Ignition switch
• Instrument panel cluster
• K10
• K11
• Key
• Key in
• Key in sig
• Key out
• Logic
• M10
• M11
• Passkey ii system
• Pcm bcm u/h fuse 10a
• Pnk
• Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
• Resistor pellet
• S211
• S234
• S270
• Security ind
• Serial data
• Sp205 (behind data link connector)
• Starter (left side of engine)
• Starter rly ctrl
• Tan
• Underhood fuse block (mounted to right front strut tower)

BODY CONTROL MODULES

Body Control Modules Wiring Diagram for Buick Century Custom 2005

List of elements for Body Control Modules Wiring Diagram for Buick Century Custom 2005:

• A/t shift lock sol sup volt
• A10
• A11
• A12
• Accy power bus fuse 15a
• Anti-theft system
• B10
• B11
• B12
• Backup lamp rly ctrl
• Bcm acc fuse 10a
• Bcm power fuse 10a
• Body control module (bcm) (behind left side of dash, left of steering column)
• C2 c2
• Computer data lines system
• Courtesy lamp low ctrl
• Courtesy lamp sw out
• Crank, signal, bcm, cluster fuse 10a
• D2 c2
• Door locks fuse 20a
• Door locks system
• Driver door ajar sw sig
• Driver seat belt sw input
• Drl mod output-park brake
• Drl photocell ret
• Drl photocell sig
• Exterior lamps circuit
• Exterior lights system
• Fuse output-acc/run/crank
• Fuse output-accessory
• Fuse output-bat
• Fuse output-crank
• Fuse output-ignition 1
• G201 (below dash, left side of steering column)
• G203 (below dash, right side of steering column)
• Gnd
• Headlamp sw output
• Headlamp sw sig
• Headlights system
• Horn relay output
• Horns system
• Hot at all times
• Hot in acc or run
• Hot in off, run or start
• Hot in run or start
• Hot in start
• I/p fuse block (behind right side of dash, in right door opening)
• Ign 0, cluster, pcm & bcm fuse 10a
• Ignition key resistor lo ref
• Ignition key resistor sig
• Instrument cluster system
• Interior lights system
• Key ignition sw sig
• Lf turn sig lamp feed
• Lf turn sig sw output
• Low tire press reset sw sig
• Park lamp sw sig-off
• Park lamp sw sig-on
• Pcm, bcm u/h fuse 10a
• Pnk
• Power distribution system
• Pwr dr lk mtr feed
• Pwr dr lock sw out
• Pwr dr lock sw output
• Rap relay ctrl
• Rf turn sig lamp feed
• Rf turn sig sw output
• Right ft door open sw sig
• S211
• S234
• S269
• S270
• S283
• Serial data sig
• Serial data signal class 2
• Shift interlock system
• Tan
• Trunk ajar sw sig
• Trunk lid release sw sig
• Trunk release rly feed
• Trunk, tailgate, fuel doors system
• Underhood fuse block (mounted to right front strut tower)
• Warning system

COMPUTER DATA LINES

Computer Data Lines Wiring Diagram for Buick Century Custom 2005

List of elements for Computer Data Lines Wiring Diagram for Buick Century Custom 2005:

• (on rear of left rear wheelhouse) (if equipped) vehicle communication interface module (vcim)
• Body control module (bcm) (behind left side of dash, left of steering column)
• D12
• Data clss 2
• Data link connector (dlc) (under left side of dash, right of steering column)
• Electronic brake control module (ebcm) (w/ abs) (at left side of engine compt, near strut tower)
• G200 (behind right side of dash compt)
• G203 (below dash, right side of steering column)
• Hot at all times
• Hvac control module (automatic a/c) (lower center of dash)
• I/p fuse block (behind right side of dash, in right door opening)
• Inflatable restraint sensing & diagnostic module (sdm) (below carpet, under right front seat)
• Instrument panel cluster (ipc)
• Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
• Radio
• Radio, hvac, rfa, cluster, aldl fuse 15a
• S202
• S211
• S230
• Sp205 (behind data link connector)

COOLING FAN

Cooling Fan Wiring Diagram for Buick Century Custom 2005

List of elements for Cooling Fan Wiring Diagram for Buick Century Custom 2005:

• (cooling fan jumper harness, 19.5 cm from right connector to engine cooling fan motor) s103
• (cooling fan jumper harness, 19.5 cm from right connector to engine cooling fan motor) s104
• (cooling fan jumper harness, 20 cm from left connector to engine cooling fan motor)
• A10
• A11
• C11
• Cool fan 1 fuse 25a
• Cool fan 2 fuse 15a
• Cool fan 1 relay
• Cool fan 2 relay
• Cool fan 3 relay
• E10
• Ect gnd
• Ect sig
• Engine controls system
• Engine coolant temperature (ect) sensor (top left side of engine, below throttle body)
• F12
• G113 (lower right front of engine, on transaxle stud, left of starter)
• High spd
• Hot at all times
• Left cooling fan diode
• Left cooling fan motor (on left side of radiator)
• Low spd
• Nca
• P10
• P11
• Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
• R10
• R11
• Right cooling fan diode
• Right cooling fan motor (on right side of radiator)
• S101
• S102
• S105
• S121 (fuel injector jumper harness, midway between fuel injector no 3 breakout & map sensor breakout)
• T10
• T11
• U11
• Underhood fuse block (mounted to right front strut tower)
• V10
• V11

CRUISE CONTROL

Cruise Control Wiring Diagram for Buick Century Custom 2005

List of elements for Cruise Control Wiring Diagram for Buick Century Custom 2005:

• (ashtray jumper wiring harness, inside ashtray, 5 cm from c242) s295
• Anti-lock brakes system
• B10
• Brake signal input
• Computer data lines system
• Cruise control module (ccm) (front of left strut tower)
• Cruise control on/off switch
• Cruise control release switch (under left side of dash, on brake pedal bracket)
• Cruise fuse 10a
• Cruise ind
• Cruise on/off
• Disable input
• Disable output
• Engage input
• Engaged output
• Exterior lights system
• G201 (below dash, left side of steering column)
• Ground
• Hot at all times
• Hot in run
• I/p fuse block (behind right side of dash, in right door opening)
• Ignition
• Instrument panel cluster (ipc)
• Logic
• Off
• Pnk
• Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly
• R/a
• Release signal
• Resume/accel
• S205 (i/p wiring harness, below dash, near c201, 14 cm from g201 breakout)
• S240
• S283
• Serial data
• Set sw
• Set/coast
• Stop lamp switch (on brake pedal support bracket)
• Stop lamps fuse 15a
• Turn signal/ multifunction switch (in steering column)
• Vehicle speed input
• Vehicle speed sensor (vss) (on transaxle right axle case extension)
• Vss
• Vss high
• Vss low
• Vss output

DEFOGGERS

Defoggers Wiring Diagram for Buick Century Custom 2005

List of elements for Defoggers Wiring Diagram for Buick Century Custom 2005:

• (automatic a/c) (manual a/c)
• (behind right side of dash compt) g200
• (inside rear compt, below left side of rear window trim panel) g401
• C1 k c2
• Computer data lines system
• D12
• D15 d
• Def req
• Defog enable
• Defog ind
• Defogger on ind
• Gnd
• Hot at all times
• Hot in run
• Hvac control module (lower center of dash)
• Hvac fuse 10a
• I/p fuse block (behind right side of dash, in right door opening)
• Ign
• Nca
• On/off momentary rear defogger switch
• Rear defog circuit breaker 30a
• Rear window defogger grid (at base of rear window)
• Rear window defogger relay (behind glove box, mounted to underside of cross-car beam)
• S230
• S233
• Serial data

ENGINE PERFORMANCE

3.1L VIN J

3.1L VIN J, Engine Performance Wiring Diagram (1 of 4) for Buick Century Custom 2005

List of elements for 3.1L VIN J, Engine Performance Wiring Diagram (1 of 4) for Buick Century Custom 2005:

• (behind data link connector) splice pack sp205
• (lower right front of engine, on transaxle stud, left of starter) g113
• (pin 14-15 not used)
• (pin 2-3 not used)
• (pin 23-27 not used)
• (pin 34-37 not used)
• (pin 39-42 not used)
• (pin 49-52 not used)
• (pin 66-67 not used)
• (under left side of dash, right of steer column) data link connector (dlc)
• 1-2 ss valve control
• 2-3 ss valve control
• A/c press return
• A/t iss hi sig
• A/t iss low sig
• Bank 1 ks signal
• Camshaft position sensor (cmp) (top front of engine, below intake plenum)
• Ckp sensor a
• Cmp signal
• Cooling fan system
• Crankshaft position (ckp) sensor a (front of engine, behind harmonic balancer)
• Crankshaft position (ckp) sensor b (right side of engine, below exhaust manifold)
• Cruise control system
• Cruise disable output
• Ecm fuse 22 10a
• Egr val ign pos volt
• Elek ign fuse 25 15a
• Eng emis fuse 30 10a
• Eng spd sig
• Evap can purge control
• F/injr fuse 28 15a
• Fuel inj 1 control
• Fuel inj 2 control
• Fuel inj 3 control
• Fuel inj 5 control
• Fuel inj 6 control
• G111 (lower left front of engine, on transaxle stud, left of starter)
• High speed fans control
• Ho2s sig low
• Hot at all times
• Hot in off, run or start
• Hot in run or start
• I/p fuse block (behind right side of dash, in right door opening)
• Iac valve b high
• Iat sensor ground
• Ic control
• Ign 0 fuse 10a
• Ignition amplifier and switching module
• Ignition control module (icm) (top right side of engine)
• Ignition power
• Knock sensor (ks) 1 (lower left side of engine, above starter)
• Low ref
• Low speed fans control
• Maf sensor signal
• Map sensor
• Map/ect sensor ref
• Pcm ground
• Pnk
• Pnk b
• Power (battery)
• Powertrain control module (pcm) (left front side of eng compt, in air cleaner assembly)
• Red
• Ref low
• S106
• S187
• S270
• Sensor ground
• Sensor return
• Serial data (class 2)
• Spark plugs
• Tcc brake switch input
• Tp sensor ref
• Tr switch input b
• Underhood fuse block (mounted to right strut tower)
• Vss high
• Vss low
• Vss output

3.1L VIN J, Engine Performance Wiring Diagram (2 of 4) for Buick Century Custom 2005

List of elements for 3.1L VIN J, Engine Performance Wiring Diagram (2 of 4) for Buick Century Custom 2005:

• Automatic transmission
• Automatic transmission fluid pressure manual valve position switch
• Evaporative emissions (evap) canister purge solenoid valve (top right side of engine, behind ignition control module)
• Evaporative emissions (evap) canister vent solenoid valve (behind left side of rear fascia splash shield, in wheelwell)
• Fuel injectors (on intake manifold)
• G113 (lower right front of engine, on transaxle stud, left of starter)
• Iss sensor
• Pnk
• Pressure control solenoid valve
• S106
• S109
• Stoplight switch (on brake pedal support bracket)
• Transmission internal mode switch
• Vehicle speed sensor (vss) (on transaxle right axle case extension)

3.1L VIN J, Engine Performance Wiring Diagram (3 of 4) for Buick Century Custom 2005

List of elements for 3.1L VIN J, Engine Performance Wiring Diagram (3 of 4) for Buick Century Custom 2005:

• (compartment, 4 cm from powertrain control module breakout)
• (fuel injector jumper harness, midway between fuel injector 3 breakout & map sensor breakout)
• (left side of engine, in air cleaner duct) mass airflow (maf) sensor
• (lower left side of engine, above starter) engine oil pressure (eop) switch
• (on throttle body assembly) idle air control (iac) valve
• A/c refrigerant pressure sensor (at left front strut tower, on a/c liquid line)
• B12
• Engine coolant temperature (ect) sensor (top left side of engine, below throttle body)
• Exhaust gas recirculation (egr) valve (top rear of engine, near throttle body)
• Fuel tank pressure (ftp) sensor (on top of fuel tank)
• G113 (lower right front of engine, on transaxle stud, left of starter)
• Generator
• Instrument cluster
• Intake air temperature (iat) sensor (left front of engine compt, in air cleaner duct)
• L b
• Logic
• Malfunction indicator lamp
• Manifold absolute pressure (map) sensor (top right side of engine, above valve cover)
• P r n
• Pnk
• Red
• S106
• S121
• S167
• S409
• Tan
• Throttle position (tp) sensor (on throttle body assembly)
• To right strut tower)
• Underhood fuse block (mounted c1

3.1L VIN J, Engine Performance Wiring Diagram (4 of 4) for Buick Century Custom 2005

List of elements for 3.1L VIN J, Engine Performance Wiring Diagram (4 of 4) for Buick Century Custom 2005:

• (behind right side of dash, in right door opening)
• (inside rear compt, below right side of rear window trim panel)
• (lower right front of engine, on transaxle stud, left of starter)
• (not used)
• (pin 12-15 not used)
• (pin 31-32 not used)
• (pin 40-41 not used)
• (pin 47 not used)
• (pin 51-54 not used)
• (pin 64-65 not used)
• (pin 8-9 not used)
• 1-2 shift sol vlv
• 2-3 shift sol valve a
• 5 volt ref
• 5v ref a
• A/c compress clutch rly
• A/c refrig press signal
• A/c request signal
• A11
• Air conditioning system
• Air pmp relay
• Automatic transmission
• Ckp sens
• Ckp sens return
• Cluster fuse 10a
• Cmp/ckp sensor batt (+)
• Cmp/ckp sensor ground
• Crank
• Crank signal fuse 10a
• Cruise control system
• Cruise status
• D10
• Ect sensor signal
• Egr pintle position signal
• Egr val control
• Eng oil press switch in
• Evap can vent sol control
• F/pmp fuse 35 15a
• F/pump relay
• Fluid temp sensor
• Fuel inj 4 control
• Fuel level sensor
• Fuel level sensor input
• Fuel pump
• Fuel pump prime con- nec- tor
• Fuel pump relay control
• Fuel pump sender assembly
• Fuel tank press signal
• G113
• G402
• Gen terminal l output
• Heated oxygen sensor 1 (ho2s 1) (in right side exhaust manifold)
• Heated oxygen sensor 2 (ho2s 2) (in exhaust system, rear of catalytic converter)
• Ho2s 1 signal
• Ho2s 2 signal
• Ho2s htr lo ctrl
• Ho2s low ctrl
• Hot at all times
• Hot in run or start
• Hot in start
• I/p fuse block
• Iac coil a high
• Iac coil a low
• Iac coil b low
• Iat sensor signal
• Ignition positive volt
• Map sensor signal
• Mil control
• Nca
• Oxy sen fuse 29 15a
• Pc sol hi
• Pc sol lo
• Pcm- bcm fuse 10a
• Pnk
• Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
• Red
• S106
• S115 red
• S234
• Sensor ground
• Starter enable control
• Starting/ charging system
• Tan
• Tcc pwm sol val control
• Tcc rel sw sig
• Tcc sol valve
• Tft sensor signal
• Tp sensor signal
• Tps 5 volt ref
• Tr switch input a
• Tr switch input c
• Tr switch input p
• Trans fuse 26 10a
• Underhood fuse block (mounted to right strut tower)

EXTERIOR LIGHTS

Back-up Lamps Wiring Diagram for Buick Century Custom 2005

List of elements for Back-up Lamps Wiring Diagram for Buick Century Custom 2005:

• A8 c3
• B1 c2
• Back-up lamp relay (behind left side of dash, mounted to multi-purpose bracket, near bcm)
• Body control module (bcm) (behind left side of dash, left of steering column)
• G402 (inside rear compt, below right side of rear window trim panel)
• Hot at all times
• Left back-up lamp
• R/cmpt rel fuse 7.5a
• Right back-up lamp
• S904 (back-up lamp wiring harness, in rear compt lid, 6.5 cm from p915)
• S915
• Underhood fuse block (mounted to right front strut tower)

Exterior Lamps Wiring Diagram for Buick Century Custom 2005

List of elements for Exterior Lamps Wiring Diagram for Buick Century Custom 2005:

• (back-up lamp wiring harness, in rear compartment lid, 31 cm from p915)
• (body wiring harness, right side of rear compt, 33 cm from c390 breakout) s408
• (i/p wiring harness, 7 cm from data link connector breakout, toward c201)
• (i/p wiring harness, midway between headlamp switch breakout & back-up lamp relay breakout)
• (i/p wiring harness, right side of dash, below glove compt, 11 cm from g200 breakout) s267
• (in steering column) turn signal/multi-function switch
• (inside rear compt, below right side of rear window trim panel) g402
• A10
• A11
• A12
• A13
• A14
• A15
• Ambient light sensor (on top right side of dash, near defogger outlet)
• B c1
• Body control module (bcm) (behind left side of dash, left of steering column)
• C1 a
• C2 f8
• C3 c5
• Center high mounted stop lamp (chmsl)
• D12
• Drl ambient light sensor low ref
• Drl ambient light sensor signal
• E10
• E11
• E12
• E13
• Exterior lamp off input
• F11
• F12
• G201 (below dash, left side of steering column)
• G401 (inside rear compt, below left side of rear window trim panel)
• G402 (inside rear compt, below right side of rear window trim panel)
• Ground
• Hazard
• Hazard fuse 15a
• Head
• Headlamp switch
• Hot at all times
• Hot in run or start
• I/p fuse block (behind right side of dash, in right door opening)
• Instrument panel cluster (ipc)
• Interior lights system
• Left
• Left cornering/ marker lamp
• Left front park/turn signal lamp
• Left headlamp assembly
• Left license lamp
• Left rear marker lamp
• Left rear park lamps
• Left tail lamp
• Left tail/ turn signal/ stop lamp
• Left turn ind
• Left turn sig sw sig
• Left turn signal
• Logic
• Lp park fuse 20a
• Normal
• Off
• Park
• Park lamp relay (behind right side of dash, on cross-car beam)
• Park lamp relay control
• Pnk
• Power distribution system
• Prk/ lght fuse 10a
• R/lamps fuse 15a
• Radiator support) g101
• Red
• Right
• Right cornering/ marker lamp
• Right front park/turn signal lamp
• Right headlamp assembly
• Right license lamp
• Right rear marker lamp
• Right rear park lamps
• Right tail lamp
• Right tail/ turn signal/ stop lamp
• Right turn ind
• Right turn sig sw sig
• Right turn signal
• S124
• S205 (i/p wiring harness, below dash, near c201, 14 cm from g201 breakout) a
• S283
• S291
• S292
• S402
• S403
• S406
• S915
• S919
• Stop lamp switch (on brake pedal support bracket)
• Stop lamps fuse 15a
• Timer
• Trn/sig fuse 10a
• Turn signal/ hazard flasher module (behind left side of dash, mounted on multi-purpose bracket, near bcm)
• Underhood fuse block (mounted to right front strut tower)

GROUND DISTRIBUTION

Ground Distribution Wiring Diagram (1 of 2) for Buick Century Custom 2005

List of elements for Ground Distribution Wiring Diagram (1 of 2) for Buick Century Custom 2005:

• (forward lamp wiring harness, below left headlamp, 7 cm from left headlamp breakout)
• (if equipped) electronic brake control module (ebcm)
• (if equipped) left steering wheel controls
• (if equipped) right steering wheel controls
• (manual a/c) left air temperature actuator
• (manual a/c) right air temperature actuator
• (mounted to right front strut tower) underhood fuse block
• (not used)
• A/c clutch diode
• A/c compressor clutch
• A18
• Automatic a/c
• Automatic transmission
• Battery
• Blower motor control processor
• Blower motor resistor assembly
• C106
• C107
• C11
• C113
• C203
• C205
• Cigar lighter
• Cool fan 2 relay
• Data link connector (dlc)
• F/pump relay
• G100 (right side of engine compt, at base of battery)
• G101 (front left side of radiator support)
• G111 (lower left front of engine, on transaxle stud, left of starter)
• G113 (lower right front of engine, on transaxle stud, left of starter)
• G171 (left side of engine compt, below master cylinder)
• G200 (behind right side of dash compt)
• Horn
• Hvac control module
• I/p compartment lamp/ switch
• Ign main relay
• Ignition control module (icm)
• Inflatable restraint sensing & diagnostic module
• Inflatable restraint steering wheel module coil
• Left cornering/ marker lamp
• Left front park/ turn signal lamp
• Left headlamp assembly
• Manual a/c
• Mass air flow (maf) sensor
• Powertrain control module (pcm)
• Right cooling fan
• Right cornering/ marker lamp
• Right front park/ turn signal lamp
• Right headlamp assembly
• S106 (engine wiring harness, left side of engine compt, 7 cm from powertrain control module breakout)
• S124
• T11
• Windshield washer fluid level switch
• Windshield washer fluid pump

Ground Distribution Wiring Diagram (2 of 2) for Buick Century Custom 2005

List of elements for Ground Distribution Wiring Diagram (2 of 2) for Buick Century Custom 2005:

• (back-up lamp wiring harness, in rear compt lid, 29.5 cm from p915)
• (body wiring harness, on floor, under driver's seat, 10 cm from c311 breakout) s303
• (headliner wiring harness, left side of windshield header, 10.5 cm from left sunshade mirror breakout)
• (if equipped) vehicle communications interface module (vcim)
• (left taillamp wiring
• A12
• Automatic headlamp relay
• Body control module (bcm)
• Brake fluid level switch
• Brake to shift relay
• Center high mounted stop lamp (chmsl)
• Cruise control module
• Data link connector (dlc)
• Driver door lock
• Driver door lock switch
• Driver seat adjuster switch
• Driver seat belt switch
• Driver window master switch
• Front passenger door lock
• Front passenger door lock switch
• Front passenger window switch
• Fuel pump & sender assembly
• G201 (below dash, left side of steering column)
• G203 (below dash, right side of steering column)
• G301 (inside left door sill, forward of left front seat)
• G401 (inside rear compt, below left side of rear window trim panel)
• G402 (inside rear compt, below right side of rear window trim panel)
• Harness, 13 cm from s383
• Harness, 3 cm from p401) s403
• Headlamp switch
• Ignition switch
• Inside rearview mirror
• Instrument panel cluster (ipc)
• Left backup lamp
• Left license lamp
• Left rear door lock
• Left rear marker lamp
• Left rear park lamp
• Left roof rail courtesy/ reading lamp
• Left tail lamp
• Left tail/ stop & turn signal lamp
• Left vanity mirror lamp
• Lid, 38 cm from p932) s905
• Nca
• Outside rearview mirror switch
• Radio
• Radio speaker breakout)
• Reading lamps
• Rear compartment lid ajar switch
• Rear compartment lid lock release actuator
• Rear compartment lid release switch
• Rear window defogger grid
• Remote control door lock receiver (rcdlr)
• Right backup lamp
• Right license lamp
• Right rear door lock
• Right rear marker lamp
• Right rear park lamp
• Right roof rail courtesy/ reading lamp
• Right tail lamp
• Right tail/ stop & turn
• Right vanity mirror lamp
• S211 (right side of steering column, 20 cm from instrument cluster breakout)
• S330
• S402 (right taillamp wiring harness, 3 cm from p402)
• Signal lamp
• Steering column
• Steering column, 4 cm from headlamp switch breakout)
• Tan
• Tire reset switch
• Turn signal/ hazard flasher module
• Turn signal/ multi- function switch
• W/ sunshade, w/o sunshade, reading lamps
• Wind- shield wiper motor

HEADLIGHTS

Headlights Wiring Diagram for Buick Century Custom 2005

List of elements for Headlights Wiring Diagram for Buick Century Custom 2005:

• A10
• A11
• Ambient light sensor (on top right side of dash, near defogger outlet)
• Automatic headlamp relay
• B7 pnk
• Battery
• Body control module (bcm) (behind left side of dash, left of steering column)
• D11
• F10
• F2 c3
• Flash to pass
• G201 (below dash, left side of steering column)
• Hdlp l fuse 15a
• Hdlp r fuse 15a
• Head
• Headlamp cntrl
• Headlamp dimmer switch
• Headlamp sw input
• Headlamp switch
• High
• High beam
• High beam indicator
• Hot at all times
• I/p fuse block (behind right side of dash, in right door opening)
• Ign
• Instrument panel cluster (ipc)
• Left headlamp assembly
• Light sens grd ref
• Light sensor sig
• Logic
• Low
• Low beam
• Lp park fuse 20a
• Off
• Park
• Park brk sw in
• Pnk
• Power distribution system
• Radio, hvac, rfa, cluster aldl fuse 15a
• Red
• Right headlamp assembly
• S202
• S221 (i/p wiring harness, right side of steering column, 17 cm from data link connector breakout)
• S283
• Turn signal/ multi-function switch (in steering column)
• Underhood fuse block (mounted to right front strut tower)

HORN

Horn Wiring Diagram for Buick Century Custom 2005

List of elements for Horn Wiring Diagram for Buick Century Custom 2005:

• A17
• Body control module (bcm) (behind left side of dash, left of steering column)
• C201
• C8 c3
• G101 (front left side of radiator support)
• G203 (below dash, right side of steering column)
• Horn assembly (right front of vehicle)
• Horn fuse 15a
• Horn relay
• Horn rly ctrl
• Horn slip ring
• Horn switch
• Hot at all times
• Inflatable restraint steering wheel module (in steering wheel)
• S124
• S211
• Steering column
• Underhood fuse block (mounted to right front strut tower)

INSTRUMENT CLUSTER

Instrument Cluster Wiring Diagram for Buick Century Custom 2005

List of elements for Instrument Cluster Wiring Diagram for Buick Century Custom 2005:

• (below dash, left side of steering column) g201
• (below dash, right side of steering column)
• A10
• A11
• A12
• Air bag ind
• Anti-lock ind
• B10
• B11
• B12
• Battery
• Bcm class 2 serial data
• Bcm or ipc serial data
• Body control module (bcm) (behind left side of dash, left of steering column)
• Brake fluid
• Brake fluid level switch (in brake fluid reservoir)
• Brake ind
• Change oil ind
• Charge ind
• Cluster fuse 10a
• Cluster logic
• Coolant temp ind
• Coolant temper- ature
• Crank
• Crank sig, bcm, cluster fuse 10a
• Cruise control system
• Cruise ind
• D12
• Data link connector (dlc) (under left side of dash, right of steering column)
• Door/trunk ind
• Ebcm class 2 serial data
• Electronic brake control module (ebcm) (at left side of engine compartment, near strut tower)
• Engine controls system
• Engine oil pressure (eop) switch (lower left side of engine, above starter)
• Exterior lights system
• Fuel gauge
• Fuel level sens
• Fuel level sensor
• Fuel pump & sender assembly (in fuel tank)
• G203
• Gnd
• Ground
• Headlights system
• High beam ind
• Hot at all times
• Hot in off, run or start
• Hot in run or start
• Hot in start
• Hot w/ park lamp on
• Hvac control module (lower center of dash)
• I/p fuse block (behind right side of dash, in right door opening)
• Ign
• Ign 0, cluster, pcm & bcm fuse 10a
• Ignition 1
• Ignition voltage
• Illumination (5 bulbs)
• Inflatable restraint sensing & diagnostic module (sdm) (below carpet, under right front seat)
• Instrument panel cluster (ipc)
• Int/ illum fuse 7.5a
• Interior lights system
• Left turn ind
• Left turn signal
• Low fuel ind
• Low oil pressure ind
• Low ref
• Low tire ind
• Low trac ind
• Low washer ind
• Mal- function indicator lamp (mil) (service engine soon)
• Oil pressure sw
• On sig
• Park brake switch (on parking brake assembly)
• Pcm class 2 serial data
• Pcm, abs bcm & cluster logic serial data
• Pk lps
• Pnk
• Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
• Radio, hvac, rfa, cluster, aldl fuse 15a
• Right turn ind
• Right turn signal
• S202
• S211
• S234
• S241
• S270
• S283
• S295 (ashtray jumper wiring harness, inside ashtray, 5 cm from c242)
• S409 (body wiring harness, below rear window panel between c405 & c405 breakout, 10 cm from c405 breakout)
• Sdm class 2 ign serial data
• Seat belt ind
• Security ind
• Serial data
• Service vehicle soon ind
• Sp205 (behind data link connector)
• Speed sensor
• Speedo- meter
• Srl data
• Tacho- meter
• Trac off ind
• Trip reset input
• Trip reset switch
• Vehicle speed
• Vf display
• Windshield washer fluid
• Wiper/washer system

INTERIOR LIGHTS

Courtesy Lamps Wiring Diagram (1 of 2) for Buick Century Custom 2005

List of elements for Courtesy Lamps Wiring Diagram (1 of 2) for Buick Century Custom 2005:

• Accy pwr bus fuse 15a
• B5 driver door unlatch sig c2
• Battery
• Body control module (bcm) (behind left side of dash, left of steering column)
• C4 b4
• Court lmps feed
• Court lmps on
• Ctsy lmp low ctrl
• Dimmer switch
• Dome
• Door ajar sw sig
• Driver door lock
• Front passenger door lock
• G200 (behind right side of dash compartment)
• G201 (below dash, left side of steering column)
• G301 (inside left door sill, forward of left front seat)
• Headlamp switch
• Hot at all times
• I/p compartment lamp/switch (in glove compartment box)
• I/p fuse block (behind right side of dash, in right door opening)
• Left i/p courtesy lamp
• Left rear door lock
• Off
• Radio, 22 cm from radio breakout) a
• Remote control door lock receiver (rcdlr) (behind instrument cluster)
• Right i/p courtesy lamp
• Right rear door lock
• S214
• S230
• S283
• S303
• S322
• S504
• S604
• Serial data
• Trunk ajar sw sig

Courtesy Lamps Wiring Diagram (2 of 2) for Buick Century Custom 2005

List of elements for Courtesy Lamps Wiring Diagram (2 of 2) for Buick Century Custom 2005:

• (headliner wiring harness, 6.5 cm from right sunshade mirror breakout) s386
• (inside rear compartment, below right side of rear window trim panel) g402
• (not used)
• (w/ onstar)
• (w/o onstar)
• Dome lamp (w/o sunroof & reading lamps)
• G402 (inside rear compartment, below right side of rear window trim panel)
• Inside rearview mirror
• Left roof rail courtesy/ reading lamp
• Left vanity mirror lamp
• Nca
• Rear compartment courtesy lamp
• Rear compartment lid ajar switch (on rear compartment lid lock assembly)
• Right roof rail courtesy/ reading lamp
• Right vanity mirror lamp
• S321
• S382 (headliner wiring harness, left side of windshield header, 4 cm from left sunshade mirror breakout)
• S383
• S385
• S392 (headliner wiring harness, 6.5 cm from dome light breakout)
• S400 (body wiring harness, 4 cm from rear compartment courtesy lamp breakout)
• S905
• W/ sunshade, reading lamps
• W/o sunshade, reading lamps

Instrument Illumination Wiring Diagram for Buick Century Custom 2005

List of elements for Instrument Illumination Wiring Diagram for Buick Century Custom 2005:

• (5 bulbs)
• (automatic a/c)
• (i/p wiring harness, lower dash, below radio, 15 cm from radio breakout)
• (manual a/c)
• (not used)
• B12
• C16
• C203
• C205
• Dome
• Driver door lock switch
• Driver master window switch
• Early production
• Exterior lights system
• Front passenger door lock switch
• Front passenger window switch
• G200 (behind right side of dash compartment)
• G200 breakout)
• G201 (below dash, left side of steering column)
• G301 (inside left door sill, forward of left front seat)
• Head
• Headlamp switch
• High
• Hot at all times
• Hvac control module (lower center of dash)
• I/p fuse block (behind right side of dash, in right door opening)
• Illum
• Inflatable restraint steering wheel module coil (in steering column, behind steering wheel)
• Instrument panel cluster (ipc)
• Int/ illum fuse 7.5a
• Left steering wheel controls (w/ accessory steering wheel controls)
• Logic
• Low
• Lp park fuse 20a
• Off
• Outside rear view mirror switch
• Park
• Power distribution system
• R/lamps fuse 15a
• Radio
• Red
• Right steering wheel controls (w/ accessory steering wheel controls)
• S230
• S241
• S283
• S303
• S504
• S506 (left front door wiring harness, 4 cm from driver door lock switch breakout)
• S604
• S606 (left front door wiring harness, 4 cm from driver door lock switch breakout)
• Str/ whl cntrl fuse 2a
• Underhood fuse block (mounted to right front strut tower)
• Vf dim dis sig
• Vf dim sig
• Vf sply volt-1

POWER DISTRIBUTION

Power Distribution Wiring Diagram (1 of 3) for Buick Century Custom 2005

List of elements for Power Distribution Wiring Diagram (1 of 3) for Buick Century Custom 2005:

• (i/p wiring harness, right side of steering column, 19 cm from radio breakout) s202
• (not used)
• 60a
• A/c clutch fuse 23 10a
• A/c clutch relay 15
• Abs fuse 1
• Accy pwr bus fuse 15a
• Automatic a/c
• Automatic headlamp relay
• Back-up lamp relay
• Batt 1 fuse 7 60a
• Batt 2 fuse 4 60a
• Batt 3 fuse 3 60a
• Battery
• Bcm pwr fuse 10a
• Blower motor control processor
• Blower motor resistor assembly
• Body control module (bcm)
• C2 l c12
• Cigar lighter
• Cool fan 1 fuse 6 25a
• Cool fan 1 relay 12
• Cool fan 2 fuse 24 15a
• Cool fan 2 relay 9
• Cool fan 3 relay 10
• Crank fuse 2 40a
• Crank relay 11
• Data link connector (dlc)
• Door locks fuse 20a
• Driver seat adjuster switch (if equipped)
• E10
• Ecm fuse 22 10a
• Electronic brake control module (ebcm)
• F/pmp fuse 35 15a
• F/pmp relay 19
• From batt 2 fuse 4 (diagram 1 of 3)
• From f/pmp a fuse 35 (diagram 1 of 3)
• Fusible link (10 ga- rust)
• G200 (behind right side of dash compt)
• Gen fuse 21 10a
• Generator
• Hazard fuse 15a
• Hdlp l fuse 36 15a
• Hdlp r fuse 32 15a
• Headlamp switch
• High blower fuse 30a
• Horn fuse 27 15a
• Horn relay 16
• Hvac control module
• I/p fuse block (behind right side of dash, in right door opening)
• Instrument panel cluster (ipc)
• Left headlamp assembly
• Left high beam headlamp
• Left low beam headlamp
• Lp park fuse 34 20a
• Ltr fuse 20a
• M10
• Manual a/c
• Nca
• Outside rearview mirror switch
• Park lamp relay
• Performance enhanced audio, dual front door mtd 4 speaker system, w/ accessory cont electronic system
• Power mirrors fuse 2a
• Power seat circuit breaker 30a
• Powertrain control module (pcm)
• R/cmpt rel fuse 33 7.5a
• R10
• R11
• Radio
• Radio prem sound fuse 15a
• Radio, hvac rfa, cluster aldl fuse 15a
• Rear compartment lid release relay
• Rear defog circuit breaker 30a
• Rear window defogger relay
• Red
• Red a
• Remote control door lock receiver (rcdlr)
• Right headlamp assembly
• Right high beam headlamp
• Right low beam headlamp
• S230
• S269 (i/p wiring harness, near blower motor, 13 cm from door lock relay breakout)
• S275
• Starter
• Stop lamps fuse 15a
• Stoplamp switch
• T10
• To hdlp l fuse 36 (diagram 1 of 3)
• To high blower fuse (diagram 1 of 3)
• To ign 2 fuse 8 (diagram 2 of 3)
• To onstar fuse, diagram (2 of 3)
• To retained accessory power (rap) relay (diagram 2 of 3)
• Turn signal/ hazard flasher module
• Underhood fuse block (mounted to right front strut tower)
• W/ rap

Power Distribution Wiring Diagram (2 of 3) for Buick Century Custom 2005

List of elements for Power Distribution Wiring Diagram (2 of 3) for Buick Century Custom 2005:

• (i/p wiring harness, behind center of dash, 4 cm from radio breakout) s233
• (i/p wiring harness, near blower motor, 4 cm from door lock relay breakout)
• (i/p wiring harness, right side of steering column near, c201, 1 cm from sp205 breakout) s240
• (i/p wiring harness, right side of steering column, 13 cm from instrument cluster breakout) s234
• (not used)
• A10
• Acc
• Automatic a/c
• B10
• Bcm acc fuse 10a
• Body control module (bcm)
• C5 c
• Crank signal, bcm, cluster fuse 10a
• Cruise control module (w/ electronic automatic)
• Cruise control release switch
• Cruise fuse 10a
• Driver window master switch
• From accy power bus fuse (diagram 1 of 3)
• From batt 3 fuse (diagram 1 of 3)
• From gen d fuse 21 (diagram 1 of 3)
• From ignition switch (diagram 2 of 3)
• Heater- a/c control (manual a/c)
• Hvac control module
• Hvac fuse 10a
• I/p fuse block (behind right side of dash, in right door opening)
• Ign 0, cluster, pcm & bcm fuse 10a
• Ign1 fuse 5 30a
• Ign2 fuse 8 60a
• Ignition switch
• Instrument panel cluster (ipc)
• Left air temperature actuator
• Lock
• Low blower fuse 20a
• Manual a/c
• Off
• Onstar fuse 5a
• Pnk
• Powertrain control module (pcm)
• Pwr windows pwr sunroof circuit breaker 30a
• Rear window defogger relay
• Red
• Retained accessory power (rap) relay (behind glove box, mounted to underside of cross-car beam)
• Right air temperature actuator
• Run
• S263
• S270 (i/p wiring harness, behind right side of dash, 4 cm from blower motor control module)
• Start
• To crank signal bcm, cluster fuse (diagram 2 of 3)
• To ign main relay 13 (diagram 3 of 3)
• To low blower fuse (diagram 2 of 3)
• To s228 (diagram 3 of 3)
• Turn signal/ multi- function switch
• Underhood fuse block (mounted to right front strut tower)
• Vacuum control assembly (automatic a/c)
• Vehicle communications interface module (vcim)
• W/ rap
• W/o rap
• Windshield wiper motor
• Wiper fuse 25a

Power Distribution Wiring Diagram (3 of 3) for Buick Century Custom 2005

List of elements for Power Distribution Wiring Diagram (3 of 3) for Buick Century Custom 2005:

• (fuel injector wiring pnk
• (i/p wiring harness, right side of dash, 24 cm from g200 breakout) s228
• (inside transaxle housing,19 cm from c113) s115
• 1-2 shift solenoid (1-2 ss) valve
• 2-3 shift solenoid (2-3 ss) valve
• A/c clutch relay 15
• A11
• Abs fuse 10a
• Air bag fuse 10a
• Automatic transmission
• B12
• Body control module (bcm)
• Brake- to-shift relay
• Btsi fuse 10a
• C113
• Cluster fuse 10a
• Crank relay
• Electronic brake control module (ebcm)
• Elek ign fuse 25 15a
• Eng emis fuse 30 10a
• Evaporative emissions (evap) canister purge solenoid valve
• Evaporative emissions (evap) canister vent solenoid valve
• F/injr fuse 28 15a
• From ign 1 fuse 5 e (diagram 2 of 3)
• From ignition switch (diagram 2 of 3)
• Fuel injector
• G113 (lower right front of engine, on transaxle stud, left of starter)
• Harness, top of engine, 2 cm from fuel injector 2 breakout) s109
• Heated oxygen sensor (ho2s) 1
• Heated oxygen sensor (ho2s) 2
• I/p fuse block (behind right side of dash, in right door opening)
• Ign main relay 13
• Ignition control module (icm)
• Inflatable restraint sensing & diagnostic module (sdm)
• Instrument panel cluster (ipc)
• K10
• Mass air flow (maf) sensor
• Nca
• Oxy sen fuse 29 15a
• Pcm,bcm u/h fuse 10a
• Pnk
• Powertrain control module (pcm)
• Red
• S106
• Stoplamp switch
• Torque converter clutch solenoid valve
• Trans fuse 26 10a
• Turn signal fuse 10a
• Turn signal/ hazard flasher module
• Underhood fuse block (mounted to right front strut tower)

POWER DOOR LOCKS

Power Door Locks Wiring Diagram for Buick Century Custom 2005

List of elements for Power Door Locks Wiring Diagram for Buick Century Custom 2005:

• (body wiring harness, below right front passenger seat, 35.5 cm from c311 breakout) s315
• (body wiring harness, below right side of front passenger seat, 4 cm from g302 breakout) s314
• Actuator
• All drs lock
• Battery
• Battery (b+)
• Bcm pwr fuse 10a
• Body control module (bcm) (behind left side of dash, left of steering column)
• Door lock fuse 20a
• Dr lock sw in
• Dr unlk sw in
• Driver door lock switch
• Driver dr unlk
• Front passenger door lock switch
• G201 (below dash, left side of steering column)
• G203 (below dash, right side of steering column)
• G301 (inside left door sill, forward of left front seat)
• Ground
• Hot at all times
• I/p fuse block (behind right of dash, in right door opening)
• Interior lights system
• Left front door lock
• Left rear door lock
• Lock
• Pass drs unlk
• Radio, hvac rfa, cluster, data link fuse 15a
• Remote control door lock receiver (rcdlr) (behind instrument cluster)
• Right front door lock
• Right rear door lock
• S202
• S211
• S269
• S283
• S303
• S504
• Serial data
• Tan
• Unlock

POWER MIRRORS

Power Mirrors Wiring Diagram for Buick Century Custom 2005

List of elements for Power Mirrors Wiring Diagram for Buick Century Custom 2005:

• Driver outside rearview mirror
• Ecb
• G301 (inside left door sill, forward of left front seat)
• Hot at all times
• I/p fuse block (behind right side of dash, in right door opening)
• Interior lights system
• Left mirror
• Nca
• Outside rearview mirror switch
• Passenger outside rearview mirror
• Power mirrors fuse 2a
• Right mirror
• Right/ left motor
• S504
• Up/ down motor

POWER SEATS

6-Way Power Seat Wiring Diagram for Buick Century Custom 2005

List of elements for 6-Way Power Seat Wiring Diagram for Buick Century Custom 2005:

• Back
• Down
• Driver seat adjuster motor assembly
• Driver seat adjuster switch
• Entire seat
• For- ward
• Front height
• Front vertical adjuster motor
• G301 (inside left door sill, forward of left front seat)
• Horizontal adjuster motor
• Hot at all times
• I/p fuse block (behind right side of dash, in right door opening)
• Nca
• Nca b
• Nca e
• Nca g
• Pwr/seat circuit breaker 30a
• Rear height
• Rear vertical adjuster motor
• S330
• Tan

POWER WINDOWS

Power Windows Wiring Diagram for Buick Century Custom 2005

List of elements for Power Windows Wiring Diagram for Buick Century Custom 2005:

• (body wiring harness, on floor, near center of vehicle, 20 cm from c325)
• Down
• Driver
• Driver master window switch
• Driver window motor (in driver's door)
• Express
• Express down module
• Front passenger
• Front passenger window motor
• Front passenger window switch
• G301 (inside left door sill, forward of left front seat)
• Hot in start or run or during rap
• I/p fuse block (behind right side of dash, in right door opening)
• Illumination lamp
• Interior lights system
• Left rear
• Left rear window motor
• Left rear window switch
• Lock out switch
• Pwr windows pwr sunroof circuit breaker 30a
• Right rear
• Right rear window motor (in right rear passenger door)
• Right rear window switch
• S307
• S604
• Tan
• Tan e

RADIO

Radio Wiring Diagram for Buick Century Custom 2005

List of elements for Radio Wiring Diagram for Buick Century Custom 2005:

• (not used)
• (or 1946)
• (or 1947)
• (or 1948)
• (or 1999)
• (or 511)
• (or 512)
• (or 546)
• (or 599)
• A c1
• A10
• A11
• A12
• Am/fm
• Amplifier sig
• Ant in
• Audio out
• Audio sig
• B c1
• B(+)
• B10
• B11
• B12
• Bare
• C1 a
• C2 a
• C2 b
• Class 2 serial data
• Coax
• Computer data lines system
• Ctrl sply volt
• Dimmer sw sig
• Drain wire
• Fixed mast antenna
• G203 (below dash, right side of steering column)
• Ground
• Ground distribution system
• Hot at all times
• Hot w/ parks lamps on
• I/p fuse block (behind right side of dash, in right door opening)
• Inflatable restraint steering wheel control module coil (behind steering wheel, in column)
• Int/ illum fuse 7.5a
• Interior lights system
• Left front door midrange speaker
• Left front door tweeter speaker
• Left rear speaker
• Left steering wheel controls
• Lf spkr output (+)
• Lf spkr output (-)
• Lr spkr (+)
• Lr spkr (-)
• Mute
• Nca
• Radio
• Radio audio out (-)
• Radio l audio sig
• Radio, hvac, rfa, cluster aldl fuse 15a
• Red
• Rf spkr (+)
• Rf spkr (-)
• Right front door midrange speaker
• Right front door tweeter speaker
• Right rear speaker
• Right steering wheel controls
• Rr spkr output (+)
• Rr spkr output (-)
• S202
• S211
• S241
• Scan
• Seek dn
• Seek up
• Source
• Steering ctrl sig
• Tan
• Vehicle communication interface module (vcim) (on rear of left rear wheelhouse)
• Vol dn
• Vol up

SHIFT INTERLOCK

Shift Interlock Wiring Diagram for Buick Century Custom 2005

List of elements for Shift Interlock Wiring Diagram for Buick Century Custom 2005:

• A/t shift lock control solenoid (locks shift lever when energized) (century: in column shift)
• A/t shift lock sol pwr
• Automatic transmission
• Body control module (bcm) (behind left side of dash, left of steering column)
• Brake to shift relay (left of i/p fuse block)
• Btsi fuse 10a
• Computer data lines system
• Data line
• G113 (lower right front of engine, on transaxle stud, left of starter)
• G203 (below dash, right side of steering column)
• Hot in run, bulb test or start
• I/p fuse block (behind right side of dash, in right door opening)
• Pnk
• Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
• S106
• S211
• Sig a
• Sig b
• Sig c
• Sig p
• Stop lamp switch (open when brake pedal depressed) (on brake pedal support bracket)
• Transmission internal mode switch (ims)

STARTING/CHARGING

Charging Wiring Diagram for Buick Century Custom 2005

List of elements for Charging Wiring Diagram for Buick Century Custom 2005:

• (not used) a
• (not used) c
• A8 c1
• B12
• Battery
• Charge ind
• Class 2
• Cluster fuse 10a
• Connector (right of steering column)
• Data link
• Fusible link (10 ga- rust)
• G100 (right side of engine compt, at base of battery)
• G113 (lower left front engine, on transaxle stud left of starter)
• Gen fuse 10a
• Generator l
• Hot in run or start
• I/p fuse block (behind right side of dash, in right door opening)
• Instrument panel cluster (ipc)
• Ipc
• L term monitor c2
• Logic
• P b+
• Pnk
• Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
• Red
• Ser. data class 2 c1
• Sp205 (behind data link connector)
• Starter
• Underhood fuse block (mounted to right front strut tower)
• Voltage

Starting Wiring Diagram for Buick Century Custom 2005

List of elements for Starting Wiring Diagram for Buick Century Custom 2005:

• Acc
• B red
• B12
• Battery
• Crank
• Crank fuse 40a
• Crank relay
• Crank signal bcm, cluster fuse 1oa
• F10
• Fusible link (10 ga-rust)
• G100 (right side of engine compartment, at base of battery)
• G113 (lower right front of engine, on transaxle stud, left of starter)
• Generator
• Hold- in coil
• Hot at all times
• I/p fuse block (behind right side of dash, in right door opening)
• Ign 1 fuse 30a
• Ignition switch
• K10
• K11
• Lock
• M10
• M11
• Off
• Pcm, bcm, u/h 10a
• Pnk
• Powertrain control module (pcm) (left front side of engine compartment, in air cleaner assembly)
• Pull- in coil
• Red
• Run
• Run off
• S228
• S234
• Start
• Starter
• Starter enable
• Underhood fuse block (mounted to right front strut tower)

SUPPLEMENTAL RESTRAINTS

Supplemental Restraints Wiring Diagram for Buick Century Custom 2005

List of elements for Supplemental Restraints Wiring Diagram for Buick Century Custom 2005:

• (inside left door sill, forward of left front seat) g301
• A10
• A11
• A12
• A13
• A14
• A15
• A16
• A17
• A18
• Air bag fuse 10a
• Air bag warning indicator
• B11
• Body control module (bcm) (behind left side of dash, left of steering column)
• Case ground
• Class 2 (sdm) serial data
• Data link connector (dlc) (under left side of dash, right of steering column)
• Driver seat belt switch (part of driver's seat belt assembly)
• G200 (behind right side of dash compartment)
• Ground
• High control
• Hot in run, bulb test & start
• I/p fuse block (behind right side of dash, in right door opening)
• If equipped
• Ignition
• Ignition voltage
• Inflatable restraint i/p module (right side of dash)
• Inflatable restraint sensing & diagnostic module (sdm) (below carpet, under right front seat)
• Inflatable restraint steering wheel module (in steering wheel)
• Inflatable restraint steering wheel module coil (behind steering wheel, in column)
• Instrument cluster
• Ipc class 2 serial data
• Left front inflatable restraint side impact module (in left side of driver's seat)
• Left front inflatable restraint side impact sensor (at base of left "b" pillar)
• Logic
• Low control
• Nca
• Powertrain control module (pcm) (left front side of engine compartment, in air cleaner assembly)
• S330
• Seat belt switch
• Serial data class 2
• Shorting bar
• Signal
• Solid state
• Splice pack sp205 (behind data link connector)
• Voltage

TRANSMISSION

A/T Wiring Diagram for Buick Century Custom 2005

List of elements for A/T Wiring Diagram for Buick Century Custom 2005:

• (fuel inj jumper harness, midway between fuel injector 3 breakout & map sensor breakout)
• (left side of engine compartment, 7 cm from powertrain control module breakout)
• (on transaxle right axle case extension) vehicle speed sensor (vss)
• 1-2 shift sol
• 2-3 shift sol
• A/t sensor hi
• A/t sensor lo
• Automatic transaxle fluid pressure manual valve position switch
• Automatic transaxle fluid temperature sensor
• Automatic transaxle input shaft speed sensor
• Automatic transmission
• B12
• Battery in
• Brake switch in
• C2 c
• Cluster fuse 10a
• Data link connector (dlc) (under left side of dash, right of steering column)
• Ecm fuse 22 10a
• Ect return
• Ect sensor in
• Eng emis fuse 30 10a
• Engine controls system
• Engine coolant temperature (ect) sensor (top left side of engine, below throttle body)
• G113 (lower left front of engine, on transaxle stud, left of starter)
• Hot at all times
• Hot in off, run or start
• Hot in run or start
• Hot in run, bulb test or start
• I/p fuse block (behind right side of dash, in right door opening)
• Ign 0 clstr, pcm & bcm fuse 10a
• Ignition (0) in
• Ignition (1) in
• Instrument panel cluster (ipc)
• Logic
• Mil ctrl
• P r n
• Pc sol hi
• Pc sol lo
• Pcm ground
• Pcm-bcm u/h fuse 10a
• Pnk
• Powertrain control module (pcm) (left side of engine compt, in air cleaner assembly)
• Pressure control sol
• Red
• S115
• S121
• S270 (behind right side of dash, 4 cm from blower motor control module)
• Serial data
• Service engine soon ind
• Splice pack sp205 (behind data link connector)
• Stop lamp switch (on brake pedal support bracket)
• Tan
• Tcc pwm sol
• Tcc release
• Tcc release in
• Tcc/ brake switch
• Tft sensor gnd
• Tft sensor in
• Throttle position (tp) sensor (on throttle body assembly)
• Tp 5v ref
• Tp sensor in
• Tps return
• Tr sw in-a
• Tr sw in-b
• Tr sw in-c
• Tr sw in-p
• Trans fuse 26 10a
• Transmission internal mode switch
• Underhood fuse block (mounted to right front strut tower)
• Vf display
• Vss hi (signal)
• Vss lo (ground)

TRUNK, TAILGATE, FUEL DOOR

Trunk Release Wiring Diagram for Buick Century Custom 2005

List of elements for Trunk Release Wiring Diagram for Buick Century Custom 2005:

• Body control module (bcm) (behind left side of dash, left of steering column)
• Class 2 ser data
• Computer data lines system
• Door/trunk ajar ind
• Dr/lk fuse 20a
• G203 (below dash, right side of steering column)
• G402 (inside rear compt, below right side of rear window trim panel)
• Hot at all times
• I/p fuse block (behind right side of dash, in right door opening)
• Ign
• Instrument panel cluster (ipc)
• Interior lights system
• Keyless ser data
• Lid release sw sig
• Rear compartment lid lock release actuator (on rear compartment lid lock assembly)
• Rear compartment lid release relay (behind glove box, mounted to underside of cross-car beam)
• Rear compartment lid release switch
• Release rly ctrl
• Remote control door lock receiver (rcdlr) (behind instrument cluster)
• S211
• S269
• S905
• Serial data
• Tk ajar sw sig

WARNING SYSTEMS

Warning Systems Wiring Diagram for Buick Century Custom 2005

List of elements for Warning Systems Wiring Diagram for Buick Century Custom 2005:

• door ajar sw sig
• (below dash, right side of steering column) g203
• (close w/ key in ignition)
• (inside left door sill, forward of left front seat) g301
• Accessory voltage
• Ajar
• B10
• B11
• Bcm acc fuse 10a
• Bcm class 2 serial data
• Body control module (bcm) (behind left side of dash, left of steering column)
• Chime
• Class 2 serial data
• Crank signal, bcm clstr fuse 10a
• Crank voltage
• Door unlatch sw sig
• Door/trunk ind
• Driver door lock
• Driver seat belt switch (w/ 6 way driver seat adjuster) (part of driver's seat belt assembly)
• Exterior lps off input
• G201 (below dash, left side of steering column)
• G203 (below dash, right side of steering column)
• Ground
• Head
• Headlamp switch
• Hot at all times
• Hot in acc & run
• Hot in run & start
• Hot in start
• Hot in unlock run & start
• I/p fuse block (behind right side of dash, in right door opening)
• Ign o, cluster, pcm & bcm fuse 10a
• Ignition 0 voltage
• Ignition 1 voltage
• Ignition switch (in steering column)
• Instrument panel cluster (ipc)
• Interior lights system
• Key in ign sw sig
• Latched
• Left seat belt switch
• Logic
• Low tire ind
• Low tire press sw sig
• Lp park fuse 34 20a
• Nca
• Off
• Park
• Park brake on signal
• Park brake switch (on parking brake assembly)
• Pcm, bcm u/h fuse 10a
• Pnk
• Power distribution system
• Powertrain control module (pcm) (left front side of engine compt, in air cleaner assembly)
• S211
• S234
• S270
• S283
• S322
• S330
• S504
• Seat belt ind
• Serial data
• Sp205 (behind data link connector)
• Tan
• Tire reset switch
• Un- latched
• Underhood fuse block (mounted to right front strut tower)

WIPER/WASHER

Wiper/Washer Wiring Diagram for Buick Century Custom 2005

List of elements for Wiper/Washer Wiring Diagram for Buick Century Custom 2005:

• (behind right side of dash compt) g200
• (below dash, left side of steering column) g201
• (in steering column) turn signal/ multi-funtion switch
• Delay
• Fluid lvl sig
• Hot in acc or run
• I/p fuse block (behind right side of dash, in right door opening)
• Ign
• Instrument panel cluster (ipc)
• Logic
• Low washer fluid ind
• Mist
• Nca
• Off
• Red
• S230
• S249
• Switch sig 1
• Switch sig 2
• Washer switch
• Wind- shield washer fluid level switch (in washer fluid reservoir)
• Windshield washer fluid pump (in washer fluid reservoir)
• Windshield wiper motor (on left side of firewall, below air inlet screen)
• Wiper fuse 25a
• Wiper motor
• Wiper motor high speed
• Wiper switch