AIR CONDITIONING — Buick Lucerne CX 2007 — SYSTEM WIRING DIAGRAMS

AIR CONDITIONING

Automatic A/C Wiring Diagram (1 of 2) for Buick Lucerne CX 2007

List of elements for Automatic A/C Wiring Diagram (1 of 2) for Buick Lucerne CX 2007:

• (approximately 7 cm (3 in) from branch for hazard lamp switch) s202
• (in engine harness, approximately 7 cm (3 in) from branch for throttle body assembly)
• (in i/p harness, approximately 41 cm (16 in) from branch for hazard lamp switch) s210
• (lower left rear of engine)
• (under driver's seat) g300
• (under right front passenger's seat) g304
• 3.8l
• 4.6l
• 5 volt ref
• A/c compressor clutch (on a/c compressor)
• Air temp motor ctrl
• Ambient air temp sens sig
• Ambient air temperature sensor (on center front of engine compt, on hood latch brace)
• Ambient light sensor sig
• Backlight lamp ctrl
• Batt pos vol
• Batt pos volt
• Blower motor (behind right side of dash)
• Blower motor control module (near blower motor)
• Body control module (bcm) (right of glove box)
• Cold
• Computer data lines system
• Defogger system
• Drv air temp dr ctrl a
• Drv air temp dr ctrl b
• Drv air temp dr pos sig
• Engine coolant hot
• Evap low temp sens sig
• Evaporator temperature sensor (left of blower motor)
• G112
• G115
• G300 (under driver's seat)
• Gmlan serial data
• Gnd
• Hot
• Hot at all times
• Hvac blwr fuse 40a
• Hvac control module
• I/p harn mdl fuse 10a
• Ign 1 volt
• Inside air temp sens sig
• Inside air temperature sensor (under left side of dash, left of steering column)
• Interior lights system
• L sunload sens sig
• Led dimming sig
• Left sunload sensor signal
• Logic
• Low ref
• Low reference
• Low speed gmlan serial data
• Lower mode dr ctrl b
• Lower mode dr pos sig
• Message center
• Message req
• Mode door control a
• Pass air temp dr ctrl b
• Pass air temp dr pos
• Pnk
• Power distribution system
• R sunload sens sig
• Radio
• Rear defog rly ctrl
• Rear fuse block (below left side of rear seat)
• Recir dr ctrl a
• Recir dr ctrl b
• Recir valve sol sig
• Recirculation actuator (behind right side of dash, right of blower motor)
• Right sunload sensor signal
• S106
• S200 (approximately 6 cm (2 in) from branch for hvac module)
• S203 (approximately 36 cm (14 in) from breakout for hvac module)
• S387
• Solid state
• Speed ctrl
• Sunload twilight sensor (top center of dash)
• Tan

Automatic A/C Wiring Diagram (2 of 2) for Buick Lucerne CX 2007

List of elements for Automatic A/C Wiring Diagram (2 of 2) for Buick Lucerne CX 2007:

• (3.8l)
• (3.8l: left front of engine compt, inside air cleaner housing) (4.6l: left side of engine compt) engine control module (ecm) powertrain control module (pcm)
• (4.6l)
• (in hvac harness, between evaporator temperature sensor & c202) s227
• (in hvac harness, between hvac control module & mode motors)
• (or tan)
• 3.8l
• 4.6l
• 5v ref 1
• A/c fuse 10a
• A/c refrigerant pressure sensor (near a/c compressor, on hose assembly)
• A/c relay
• Clutch rly ctrl
• Cold
• Computer data lines system
• Cool/ fan 1 relay
• Cool/ fan 2 relay
• Cool/ fan relay
• Def
• Driver air temperature actuator (left side of hvac module)
• Dry air temp signal
• Ect sens sig
• Engine coolant temperature (ect) sensor (3.8l: left rear of engine) (4.6l: right rear of engine)
• Fan 1 fuse 30a
• Fan 2 fuse 30a
• Front passenger air temperature actuator (right side of hvac module)
• G104 (right front corner of engine compt)
• Gmlan serial data +
• Gmlan serial data -
• Hi speed rly ctrl
• Hot
• Hot at all times
• Hot in run or start
• Hot w/ run/crnk relay energized
• Hvac/ ipc fuse 10a
• Left cooling fan (on left rear side of radiator)
• Low ref
• Low speed rly ctrl
• Mode actuator (on right side of hvac module)
• Mode valve signal
• Pass air temp signal
• Pnk
• Press sens sig
• Right cooling fan (on right rear side of radiator)
• S226
• Tan
• Underhood fuse block (on right front of engine compt, forward of strut tower)
• Vent

Compressor Wiring Diagram for Buick Lucerne CX 2007

List of elements for Compressor Wiring Diagram for Buick Lucerne CX 2007:

• (in engine harness, approximately 7 cm (3 in) from branch for throttle body assembly) s106
• (lower left rear of engine)
• 3.8l
• 4.6l
• 4.6l 3.8l
• 5 volt ref 1
• A/c compressor clutch (on a/c compressor)
• A/c fuse 10a
• A/c refrigerant pressure sensor (near a/c compressor, on hose assembly)
• A/c relay
• Clutch rly ctrl
• Computer data lines system
• G112
• G115
• Gmlan serial data +
• Gmlan serial data -
• Hot at all times
• Hot in run or start
• Low ref
• Powertrain control module (pcm) (3.8l) engine control module (ecm) (4.6l) (3.8l: left front of engine compt, inside air cleaner housing) (4.6l: left side of engine compt)
• Sensor signal
• Tan
• Underhood fuse block (on right front of engine compt, forward of strut tower)

Manual A/C Wiring Diagram (1 of 2) for Buick Lucerne CX 2007

List of elements for Manual A/C Wiring Diagram (1 of 2) for Buick Lucerne CX 2007:

• (approximately 36 cm (14 in) from breakout for hvac module)
• (in hvac harness, between evaporator temperature sensor & c202)
• (in hvac harness, between hvac control module & mode motors)
• (in i/p harness, approximately 41 cm (16 in) from branch for hazard lamp switch) s210
• (under right front passenger's seat) g304
• 5 volt ref
• A/c compressor clutch (on a/c compressor)
• Air temp dr ctrl b
• Air temp dr pos sig
• Air temperature actuator (right side of hvac module)
• Ambient air temp sens sig
• Ambient air temperature sensor (on center front of engine compt, on hood latch brace)
• Backlight lamp ctrl
• Batt pos vol
• Batt pos volt
• Blower motor (behind right side of dash)
• Blower motor control module (near blower motor)
• Cold
• Computer data lines system
• Def
• Defogger system
• Driver air temp signal
• Drv air temp dr ctrl a
• Evap low temp sens sig
• Evap temperature sensor (left of blower motor)
• G112 (lower left rear of engine)
• G300 (under driver's seat)
• Gnd
• Hot
• Hot at all times
• Hvac blwr fuse
• Hvac control module
• I/p harn mdl fuse 10a
• Ign 1 volt
• Interior lights system
• Led dimming sig
• Logic
• Low mode dr pos sig
• Low ref
• Low speed gmlan serial data
• Lower mode dr ctrl b
• Mode actuator (on right side of hvac module)
• Mode dr ctrl a
• Mode valve signal
• Pnk
• Power distribution system
• Rear defog rly ctrl
• Rear fuse block (below left side of rear seat)
• Recir door a ctrl
• Recir door b ctrl
• Recirculation actuator (behind right side of dash, right of blower motor)
• S200 (approximately 6 cm (2 in) from branch for hvac module)
• S203
• S226
• S227
• S387
• Speed ctrl
• Tan
• Vent

Manual A/C Wiring Diagram (2 of 2) for Buick Lucerne CX 2007

List of elements for Manual A/C Wiring Diagram (2 of 2) for Buick Lucerne CX 2007:

• 5v ref 1
• A/c fuse 10a
• A/c refrigerant pressure sensor (near a/c compressor, on hose assembly)
• A/c relay
• Clutch rly ctrl
• Computer data lines system
• Cool/ fan 1 relay
• Cool/ fan 2 relay
• Cool/ fan relay
• Ect sens sig
• Engine coolant temperature (ect) sensor (left rear of engine)
• Fan 1 fuse 30a
• Fan 2 fuse 30a
• G104 (right front corner of engine compt)
• Gmlan serial data +
• Gmlan serial data -
• Hi speed rly ctrl
• Hot at all times
• Hot in run or start
• Hot w/ run/crnk relay energized
• Hvac/ ipc fuse 10a
• Left cooling fan (on left rear side of radiator)
• Low ref
• Low speed rly ctrl
• Pnk
• Powertrain control module (pcm) (left front of engine compt, inside air cleaner housing)
• Press sens sig
• Right cooling fan (on right rear side of radiator)
• S229 (in ip harness, between c201 & c202)
• Tan
• Underhood fuse block (on right front of engine compt, forward of strut tower)