GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2008 🢒 Sierra - 4WD 🢒 Power and Signal Distribution 🢒 Wiring Systems and Power Management 🢒 Wheels/Vehicle Underbody Component Views
Figure 1:

Front Frame and Underbody Components - 1 of 2
Object Number: 1858052 Size: LF
(1)Wheel Speed Sensor (WSS) - Right Front (JL4/JF3/JF7/JH6/JH7)
(2)Chassis
(3)Wheel Speed Sensor (WSS) - Left Front (JL4/JF3/JF7/JH6/JH7)
Figure 2:

Front Frame and Underbody Components - 2 of 2
Object Number: 1695149 Size: LF
(1)Frame
(2)X110 (NQF/NQG/NQH/NP2)
(3)Front Axle Housing
(4)Front Drive Axle Actuator (NQF/NQG/NQH/NP2)
Figure 3:

Left Side Frame and Underbody Components - 1 of 2
Object Number: 1934351 Size: LF
(1)Fuel Pump and Sender Assembly - Rear (Gas with LY6)
(2)Fuel Pump and Sender Assembly - Front (Gas)
(3)Fuel Pump Relay - Secondary (Gas with LY6)
Figure 4:

Left Side Frame and Underbody Components - 2 of 2
Object Number: 1858047 Size: LF
(1)Fuel Tank Pressure (FTP) Sensor (Gas)
(2)Fuel Tank
(3)Evaporative Emissions (EVAP) Canister
(4)Evaporative Emissions (EVAP) Canister Vent Solenoid Valve (Gas)
(5)Electronic Brake Control Module (EBCM) (JL4/JF3/JF7/JH6/JH7)
(6)Fuel Pressure Sensor (Gas except 4.3L/LMG/LY6/LC9)
(7)Chassis
(8)Fuel Pump and Sender Assembly - Front (Gas)
Figure 5:

Left Side Frame and Underbody Components (Diesel)
Object Number: 1934346 Size: LF
(1)Fuel Level Sensor - Secondary (31 Series without NQZ)
(2)Fuel Pump (31 Series without NQZ)
(3)Fuel Level Sensor - Primary
Figure 6:

Right Side Frame and Underbody Components (Diesel)
Object Number: 1870632 Size: LF
(1)Rear Frame Assembly
(2)Exhaust Temperature Sensor 2
(3)Exhaust Temperature Sensor 1
(4)Exhaust Differential Sensor
Figure 7:

Left Rear Frame and Underbody Components - 1 of 3
Object Number: 1890102 Size: LF
(1)X414 (UY2/8S3)
(2)J420 (UY2)
(3)Camper/Trailer Harness
(4)J415 (UY2)
(5)Chassis Harness
(6)J416 (UY2)
(7)J417 (UY2)
(8)J414 (UY2)
(9)J421 (UY2)
(10)J410 (UY2)
(11)Blunt Cut - Camper Trailer (UY2)
(12)G401
(13)Trailer Connector (except MEX/EXP)
Figure 8:

Left Rear Frame and Underbody Components - 2 of 3
Object Number: 1878090 Size: LF
(1)Rear Frame
(2)Fuel Pump Flow Control Module (Gas except LU3/LMG/LY6/LC9)
(3)Trailer Connector (except MEX/EXP)
Figure 9:

Left Rear Frame and Underbody Components - 3 of 3
Object Number: 1858054 Size: LF
(1)Rear Bumper
(2)Junction Block - Rear Lamps
(3)Data Link Resistor
(4)Trailer Connector (except MEX/EXP)
Figure 10:

Left Rear Frame and Underbody Components (20/30 Series)
Object Number: 1870631 Size: LF
(1)Trailer Connector (except MEX/EXP)
(2)Trailer Brake Control Module (JL1)
(3)Trailer Brake Control Relay (JL1)
Figure 11:

Right Rear Frame and Underbody Components (31 Series)
Object Number: 1923014 Size: LF
(1)Trailer Brake Control Relay
(2)Trailer Brake Control Module
Figure 12:

Rear Frame and Underbody Components (10 Series)
Object Number: 2048461 Size: LF
(1)Rear Bumper
(2)Fuel Pump Flow Control Module (except LU3/LMG/LC9)
(3)Trailer Brake Control Relay (JL1)
(4)Trailer Brake Control Module (JL1)
Figure 13:

Rear Frame and Underbody Components (JL4)
Object Number: 1858053 Size: LF
(1)Wheel Speed Sensor (WSS) - Left Rear
(2)Wheel Speed Sensor (WSS) - Right Rear