TRANSMISSION – Buick LaCrosse CXL 2008 – SYSTEM WIRING DIAGRAMS

TRANSMISSION

3.6L VIN 7

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

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

• (below left side of dash, left of steering column) body control module
• (in i/p wiring harness, behind right side of dash, 4 cm from breakout to rcdlr, towards ambient light sensor)
• 1-2 shift solenoid (ss) valve
• 1-2 sol vlv ctrl
• 10 volt ref
• 2-3 shift solenoid (ss) valve
• 2-3 sol vlv ctrl
• A red
• Automatic transmission
• Automatic transmission fluid pressure manual valve position switch
• Automatic transmission fluid temperature (tft) sensor
• Automatic transmission input shaft speed (iss) sensor
• Battery
• Brake pedal position sensor (under left side of dash, on right side of brake pedal)
• Code a
• Code b
• Code c
• Data link connector (under left side of dash)
• Engine control module (top of engine)
• G115 (mounted to bank 1 cylinder head above exhaust manifold)
• Gmlan serial data
• Ground
• Hot at all times
• Hot w/ ign 1 relay energized
• Ign 1
• Ign 3 voltage
• Iss high sig
• Iss low sig
• J115
• J116
• J201
• J202
• Low ref
• P/n
• P/n signal
• Parity
• Pc sol vlv ctrl
• Pc sol vlv hi ctrl
• Pnk
• Pressure control (pc) solenoid valve
• Red
• Serial data bus +
• Serial data bus -
• Serial data bus+
• Serial data bus-
• Stop lp sw
• Stop lp sw sig
• Sw sig
• Tan b
• Tcc pwm sol ctrl
• Tcc rel sw sig
• Tcc release switch
• Tcm fuse 8 15a
• Terminator resistor
• Tft sens sig
• Torque converter clutch (tcc) solenoid valve
• Trans range a
• Trans range b
• Trans range c
• Trans range p
• Trans sol fuse 21 10a
• Transmission control module (tcm) (inside air cleaner, left front of engine compartment)
• Transmission internal mode switch
• Underhood fuse block (mounted to right strut x1 tower)
• Vehicle speed sensor (vss) assembly (right side of transmission, near right axle shaft)
• Vss hi sig
• Vss low sig

3.8L VIN 2

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

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

• (not used)
• (on top right of intake manifold)
• (throttle pos)
• 1-2 shift sol
• 1-2 shift solenoid (ss) valve
• 2-3 shift sol
• 2-3 shift solenoid (ss) valve
• 5 volt ref 1
• A/t fluid pressure (tfp) manual valve position
• A/t fluid temp- erature sensor
• A/t input shaft speed (iss) speed
• Acc
• At iss sig high
• At iss sig low
• Automatic transmission
• Automatic transmission internal mode switch (ims)
• Battery
• Code a
• Code b
• Code c
• Ect sensor sig
• Engine coolant temperature (ect) sensor
• G113 (lower left front of engine, on transmission stud, near starter)
• Ground
• Hot at all times
• Hot w/ ign 1 relay energized
• Ignition 1
• Ignition 3
• Ignition switch
• J101
• J115
• Lock
• Low ref
• Manifold absolute pressure (map) sensor (top right side of intake manifold)
• Map sensor sig
• Parity
• Pc sol high
• Pc sol low
• Pcm fuse 15 10a
• Pcm/ etc fuse 16 15a
• Pnk
• Powertrain control module (left side of engine compartment, near air cleaner assembly)
• Pressure control (ps) solenoid valve
• Red
• Red a
• Run
• Start
• Switch
• Tan
• Tan b
• Tcc sol
• Tcc sw sig
• Tft sensor sig
• Throttle actuator control (tac) module (on throttle body assembly)
• Torque converter clutch (tcc) solenoid valve
• Tr sig a
• Tr sig b
• Tr sig c
• Tr sig p
• Trans sol fuse 21 10a
• Uart data
• Underhood fuse block (mounted to right strut tower)
• Vehicle speed sensor assembly (right side of transmission, near right axle shaft)
• Vss sig high
• Vss sig low

5.3L VIN C

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

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

• 1-2 shift solenoid (ss) valve
• 1-2 sol vlv ctrl
• 10 volt ref
• 2-3 shift solenoid (ss) valve
• 2-3 sol vlv ctrl
• Acc
• Acc volt
• Automatic transmission
• Automatic transmission fluid temperature (tft) sensor
• Batt positive volt
• Body control module (bcm) (below left side of dash, left of steering column)
• Brake pedal position sensor (under left side of dash, on right side of brake pedal)
• Code a
• Code b
• Code c
• Computer data lines system
• Emc/tcm fuse 8 15a
• Engine control module (ecm) (left front of engine compt)
• G115
• Ground
• Hot at all times
• Hot w/ ignition main pcb relay energized
• Ign 1 volt
• Ign 3 voltage
• Ignition switch
• Iss high sig
• Iss low sig
• J115
• Lock
• Low ref
• P/n
• P/n signal
• Parity
• Pc sol vlv ctrl
• Pc sol vlv hi ctrl
• Pnk
• Pressure control (pc) solenoid valve
• Red
• Run
• Serial data bus+
• Serial data bus-
• Start
• Stop lp sw
• Stop lp sw sig
• Sw sig
• Tan
• Tcc pwm sol ctrl
• Tcc rel sw sig
• Tcc release switch
• Tft sens sig
• Torque converter clutch (tcc) solenoid valve
• Trans fuse 10a
• Trans range sig a
• Trans range sig b
• Trans range sig c
• Trans range sig p
• Transmission control module (tcm) (left front of engine compt)
• Transmission fluid pressure manual valve position switch
• Transmission input shaft speed (iss) sensor
• Transmission internal mode switch
• Underhood fuse block (mounted to right strut tower)
• Vehicle speed sensor (vss) assembly (right side of transmission, near right axle shaft)
• Vss hi sig
• Vss low sig