2008 Hummer H3 L5-3.7LFACTORY OEM SERVICE PROCEDURE

Front of Vehicle/Engine Compartment Component Views



Front of Vehicle/Engine Compartment Component Views

Front of the Vehicle Components

Factory service manual diagram



1 - Marker Lamp - Left Front
2 - Park/Turn Signal Lamp - Left Front
3 - Headlamp - Left
4 - Fog Lamp - Left Front
5 - Fog Lamp - Right Front
6 - Headlamp - Right
7 - Park/Turn Signal Lamp - Right Front
8 - Marker Lamp - Right Front

Front of the Engine Compartment Components

Factory service manual diagram



1 - J185
2 - J109
3 - J112
4 - J120
5 - Horn
6 - X117
7 - J134
8 - X115
9 - X116

Engine Compartment Components - 1 of 3

Factory service manual diagram



1 - Engine Control Module (ECM) X1
2 - Engine Control Module (ECM)
3 - Heated Oxygen Sensor (HO2S) 2 (LLR)
4 - Fuse Block - Underhood
5 - Engine Harness
6 - Heated Oxygen Sensor (HO2S) 1 (LLR)
7 - Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor
8 - Engine Control Module (ECM) X3
9 - Engine Control Module (ECM) X2

Engine Compartment Components - 2 of 3

Factory service manual diagram



1 - Rear Window Washer Fluid Pump
2 - Windshield Washer Fluid Pump
3 - Body Harness
4 - Windshield Wiper Motor

Engine Compartment Components - 3 of 3

Factory service manual diagram



1 - Body Harness
2 - A/C Refrigerant Pressure Sensor
3 - A/C Compressor Clutch
4 - Ambient Air Temperature Sensor
5 - Inflatable Restraint Front End Sensor - Right
6 - Lower Radiator Support
7 - Inflatable Restraint Front End Sensor - Left

Left Side of the Engine Compartment Components

Factory service manual diagram



1 - Negative Battery Cable
2 - Battery
3 - Positive Battery Cable
4 - Generator
5 - Engine (LLR)
6 - G120
7 - G100
8 - X130 (UE1)
9 - Generator Battery Control Module
10 - Onstar Fuse (UE1)

Rear of the Engine Compartment Components

Brake Components (w/o JL4):

Factory service manual diagram



1 - Inflatable Restraint Vehicle Rollover Sensor (ASF)
2 - Yaw and Lateral Accelerometer Sensor
3 - Brake Fluid Reservoir
4 - Electronic Brake Control Module (EBCM) X2
5 - Electronic Brake Control Module (EBCM)
6 - Electronic Brake Control Module (EBCM) X1
7 - Brake Fluid Level Switch
Factory Service Tools

Use the Manual With the Right Hardware

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.