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 AutomaticFACTORY OEM SERVICE PROCEDURE
Circuit/System Testing
- Verify that the transmitter being used is a correct P/N transmitter for the vehicle.
- If not the correct transmitter, replace the transmitter.
- Using the J 43241
, place the keyless entry transmitter on the test pad and press each transmitter button one at a time. The green light on the tester should illuminate and a tone should sound with each button press.
- If no tone or illumination occurs with any of the buttons, replace the transmitter battery and retest the transmitter.
- If no tone or illumination occurs with one or more, but not all, buttons, replace the transmitter.
- Ignition ON, verify the scan tool No. of Fob's Programmed parameter is Fob 1, Fob 2, Fob 3 or Fob 4.
- If not the specified value, reprogram the keyless entry transmitters. Refer to Transmitter Programming . If the keyless entry transmitters will not program, replace the BCM.
- If all circuits test normal, replace the BCM.
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.
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