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.
2007 Hummer H3 L5-3.7LFACTORY OEM SERVICE PROCEDURE
Scan Tool Data Definitions
Scan Tool Data Definitions
Body Control Module (BCM)
Battery 1
Displays 0.0-25.5 V. This parameter is the system voltage measured by the BCM at the BCM battery input.
Brake to Shift Relay
Displays ON/OFF. This parameter indicates ON when the mechanical lock is engaged preventing an inadvertent shift out of the PARK position. The Display indicates OFF when BCM opens the controlled voltage circuit of the shift lock control solenoid.
Engine Control Module (ECM)
Battery 1
Displays 0.0-25.5 V. This parameter is the system voltage measured by the BCM at the BCM battery input.
TCC Brake Switch
Displays ON/OFF. This parameter indicates ON when the brake pedal is depressed and OFF when the brake pedal is released.
Factory Service Tools
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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.