Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2006 Hummer H3 L5-3.5LFACTORY OEM SERVICE PROCEDURE
Control Module: Locations
Component Locator
Transfer Case Control Component Views
1 - Accessory Switch
2 - Transfer Case Shift Control Module
3 - Transfer Case Shift Control Module C3
4 - Transfer Case Shift Control Module C2
5 - Transfer Case Shift Control Module C1
1 - Transmission Case
2 - Backup Lamp Switch
3 - Heated Oxygen Sensor (HO2S) 2
4 - Transfer Case Encoder Motor Connector
5 - Vehicle Speed Sensor (VSS) Connector
1 - Transmission Case
2 - C175 Engine Harness to Transmission Internal Harness
3 - Heated Oxygen Sensor (HO2S) 2
4 - Transfer Case Encoder Motor Connector
5 - Vehicle Speed Sensor (VSS) Connector
6 - Park / Neutral Position (PNP) Switch
Transfer Case Control Component Views
Transfer Case Components:
1 - Accessory Switch
2 - Transfer Case Shift Control Module
3 - Transfer Case Shift Control Module C3
4 - Transfer Case Shift Control Module C2
5 - Transfer Case Shift Control Module C1
Engine Harness - Rear (MA5):
1 - Transmission Case
2 - Backup Lamp Switch
3 - Heated Oxygen Sensor (HO2S) 2
4 - Transfer Case Encoder Motor Connector
5 - Vehicle Speed Sensor (VSS) Connector
Engine Harness - Rear (M30):
1 - Transmission Case
2 - C175 Engine Harness to Transmission Internal Harness
3 - Heated Oxygen Sensor (HO2S) 2
4 - Transfer Case Encoder Motor Connector
5 - Vehicle Speed Sensor (VSS) Connector
6 - Park / Neutral Position (PNP) 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:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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