AIR CONDITIONING – Buick LaCrosse CXL 2008 – SYSTEM WIRING DIAGRAMS

AIR CONDITIONING

3.6L VIN 7

3.6L VIN 7, Automatic A/C Wiring Diagram (1 of 2) for Buick LaCrosse CXL 2008

List of elements for 3.6L VIN 7, Automatic A/C Wiring Diagram (1 of 2) for Buick LaCrosse CXL 2008:

• (in back of right headlamp on frame) g100
• (mounted to bank 1 cylinder head above exhaust manifold) g115
• (part of a/c compressor) a/c compressor clutch
• A/c clu diode
• A/c clutch fuse 13 10a
• A/c comp relay
• A/c request ind
• A/c request switch
• A10
• A11
• A12
• A18
• A19
• Air temp a
• Air temp b
• Auto
• B10
• B11
• B12
• 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
• G202 (left side of dash, at base of steering column)
• Ground
• High
• Hot at all times
• Hot in run or start
• Hvac control module (center of dash)
• Ign 1 volt
• Illum
• Ind
• Interior lights system
• J116
• J211
• 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 (near right "a" pillar, on upper hvac case)
• Recirculation switch
• Right air temperature actuator (right side of hvac module)
• Sensor sig
• Speed ctrl
• Tan
• Temperature control sw
• Underhood fuse block (mounted to right strut tower)

3.6L VIN 7, Automatic A/C Wiring Diagram (2 of 2) for Buick LaCrosse CXL 2008

List of elements for 3.6L VIN 7, Automatic A/C Wiring Diagram (2 of 2) for Buick LaCrosse CXL 2008:

• (in off-engine wiring harness, 32 cm from underhood fuse block towards transmission control module)
• 5v reference 1
• A/c comp clutch
• A/c press signal
• A/c refrigerant pressure sensor (on left side of engine compt, on accumulator)
• Batt main 4 fuse 30 30a
• Battery
• Blower motor (behind right side of dash, in hvac module)
• Blower motor control module (on lower right side of dash)
• Class 2 serial
• Computer data lines system
• D11
• Display fuse 18 10a
• Ect sens sig
• Engine control module (ecm) (top of engine)
• Engine controls system
• Engine coolant temperature (ect) sensor (left side of engine block, above exhaust manifold)
• G200 (behind left side of dash knee bolster, at base of steering column)
• G202 (left side of dash, at base of steering column)
• Gnd
• Hot at all times
• Hot in run or start
• Hvac fuse 10a
• I/p fuse block (behind right side of dash)
• Ign 1 volt
• Inside air temperature sensor (left side of dash, on right of steering column)
• J118
• J119 (in on-engine wiring harness, 34.5 cm from engine control module)
• J211
• J213
• Left cooling fan motor (on left side of radiator)
• Low ref
• Pnk
• Red
• Relay ctrl
• Right cooling fan motor (on right b
• Speed ctrl
• Sunload sensor (top center of dash)
• Tan
• Underhood fuse block (mounted to right strut tower)
• Upper left air temperature sensor (center of dash, in left ventilation duct)
• Upper right air temperature sensor (center of dash, in right ventilation duct)

3.6L VIN 7, Compressor Wiring Diagram for Buick LaCrosse CXL 2008

List of elements for 3.6L VIN 7, Compressor Wiring Diagram for Buick LaCrosse CXL 2008:

• (in off-engine wiring harness, 32 cm from underhood fuse block towards transmission control module)
• (mounted to bank 1 cylinder head above exhaust manifold) g115
• (part of a/c compressor) a/c compressor clutch
• 5v reference 1
• 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, on accumulator)
• A/c request ind
• A/c request switch
• Automatic a/c
• Battery
• Class 2 serial
• Computer data lines system
• Display fuse 18 10a
• Engine control module (ecm) (top of engine)
• Engine controls system
• G202 (left side of dash, at base of steering column)
• Ground
• Hot at all times
• Hot in run or start
• Hvac control module (center of dash)
• Hvac fuse 10a
• I/p fuse block (behind right side of dash)
• Ign 1 volt
• J116
• J118
• J211
• Logic
• Low ref
• Manual a/c
• Pnk
• Underhood fuse block (mounted to right strut tower)

3.8L VIN 2

3.8L VIN 2, Automatic A/C Wiring Diagram (1 of 2) for Buick LaCrosse CXL 2008

List of elements for 3.8L VIN 2, Automatic A/C Wiring Diagram (1 of 2) for Buick LaCrosse CXL 2008:

• (in back of right headlamp on frame) g100
• (on transmission stud, to right of starter) g115
• (part of a/c compressor) a/c compressor clutch
• (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
• B10
• B11
• B12
• 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
• G202 (left side of dash, at base of steering column)
• Ground
• High
• Hot at all times
• Hot in run or start
• Hvac control module (center of dash)
• Ign 1 volt
• Illum
• Ind
• Interior lights system
• J211
• 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 (near right "a" pillar, on upper hvac case)
• 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 (mounted to right strut tower)

3.8L VIN 2, Automatic A/C Wiring Diagram (2 of 2) for Buick LaCrosse CXL 2008

List of elements for 3.8L VIN 2, Automatic A/C Wiring Diagram (2 of 2) for Buick LaCrosse CXL 2008:

• 5v reference 2
• A/c comp clutch
• A/c press signal
• A/c refrigerant pressure sensor (on left side of engine compt, on accumulator)
• Batt main 4 fuse 30 30a
• Battery
• Blower motor (behind right side of dash, in hvac module)
• Blower motor control module (on lower right side of dash)
• Class 2 serial
• Computer data lines system
• D11
• Display fuse 18 10a
• Ect sens sig
• Engine coolant temperature (ect) sensor (on top right of intake manifold)
• G200 (behind left side of dash knee bolster, at base of steering column)
• G202 (left side of dash, at base of steering column)
• Gnd
• Hot at all times
• Hot in run or start
• Hvac fuse 10a
• I/p fuse block (behind right side of dash)
• Ign 1 volt
• Inside air temperature sensor (left side of dash, on right of steering column)
• J211
• J213
• Left cooling fan motor (on left side of radiator)
• Low ref
• Pnk
• Powertrain control module (pcm) (left side of engine compt, near air cleaner assembly)
• Red
• Relay ctrl
• Right cooling fan motor (on right b
• Speed ctrl
• Sunload sensor (top center of dash)
• Tan
• Underhood fuse block (mounted to right strut tower)
• Upper left air temperature sensor (center of dash, in left ventilation duct)
• Upper right air temperature sensor (center of dash, in right ventilation duct)

3.8L VIN 2, Compressor Wiring Diagram for Buick LaCrosse CXL 2008

List of elements for 3.8L VIN 2, Compressor Wiring Diagram for Buick LaCrosse CXL 2008:

• (left side of engine compt, near air cleaner assembly)
• (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, on accumulator)
• A/c request ind
• A/c request switch
• Automatic a/c
• Battery
• Class 2 serial
• Computer data lines system
• Display fuse 18 10a
• G115 (on transmission stud, to right of starter)
• G202 (left side of dash, at base of steering column)
• Ground
• Hot at all times
• Hot in run or start
• Hvac control module (center of dash)
• Hvac fuse 10a
• I/p fuse block (behind right side of dash)
• Ignition 1
• J211
• Logic
• Low ref
• Manual a/c
• Pnk
• Powertrain control module (pcm)
• Underhood fuse block (mounted to right strut tower)

5.3L VIN C

5.3L VIN C, Automatic A/C Wiring Diagram (1 of 2) for Buick LaCrosse CXL 2008

List of elements for 5.3L VIN C, Automatic A/C Wiring Diagram (1 of 2) for Buick LaCrosse CXL 2008:

• (in back of right headlamp on frame) g100
• (on transmission stud, to right of starter) g115
• (part of a/c compressor) a/c compressor clutch
• (w/ california pzev emission system) j114
• 87a
• A/c cmprsr fuse 10a
• A/c cmprsr relay
• A/c request ind
• A10
• A11
• A12
• Air temp a
• Air temp b
• Auto
• B10
• B11
• B12
• 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
• G202 (left side of dash, at base of steering column)
• Ground
• High
• Hot at all times
• Hot in run or start
• Hvac control module (center of dash)
• Ign 1 volt
• Illum
• Ind
• Interior lights system
• J211
• 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)
• 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 (near right "a" pillar, on upper hvac case)
• 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 (mounted to right strut tower)

5.3L VIN C, Automatic A/C Wiring Diagram (2 of 2) for Buick LaCrosse CXL 2008

List of elements for 5.3L VIN C, Automatic A/C Wiring Diagram (2 of 2) for Buick LaCrosse CXL 2008:

• 5v reference 2
• A/c comp clutch
• A/c press signal
• A/c refrigerant pressure sensor (on left side of engine compt, on accumulator)
• Batt 4 fuse 30a
• Battery
• Blower motor (behind right side of dash, in hvac module)
• Blower motor control module (on lower 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 (in back of right headlamp on frame)
• G200 (behind left side of dash knee bolster, at base of steering column)
• G202 (left side of dash, at base of steering column)
• Gnd
• Hot at all times
• Hot in run or start
• Hvac fuse 10a
• I/p fuse block (behind right side of dash)
• Ign 1 volt
• Inside air temperature sensor (left side of dash, on right of steering column)
• J211
• J213
• Left cooling fan motor (on left side of radiator)
• Low ref
• Pnk
• Red
• Relay ctrl
• Right cooling fan motor (on right b
• Speed ctrl
• Sunload sensor (top center of dash)
• Tan
• Underhood fuse block (mounted to right strut tower)
• Upper left air temperature sensor (center of dash, in left ventilation duct)
• Upper right air temperature sensor (center of dash, in right ventilation duct)

5.3L VIN C, Compressor Wiring Diagram for Buick LaCrosse CXL 2008

List of elements for 5.3L VIN C, Compressor Wiring Diagram for Buick LaCrosse CXL 2008:

• (or 239)
• (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, on accumulator)
• A/c request ind
• A/c request switch
• Automatic a/c
• Battery
• Class 2 serial
• Computer data lines system
• Emission 2 fuse 15a
• Engine control module (ecm) (left front of engine compt)
• G115 (on transmission stud, to right of starter)
• G202 (left side of dash, at base of steering column)
• Ground
• Hot at all times
• Hot in run or start
• Hvac control module (center of dash)
• Hvac fuse 10a
• I/p fuse block (behind right side of dash)
• Ignition 1
• J114 (w/ california pzev emission system)
• J211
• Logic
• Low ref
• Manual a/c
• Pnk
• Underhood fuse block (mounted to right strut tower)