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.
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HOMESERVICE MANUALSCHEVROLET2008HHR LT, 2.4 P, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 500 (KEYLESS ENTRY SYSTEM AND REMOTE FUNCTIONS)DIAGNOSTIC INFORMATION AND PROCEDURESKEYLESS ENTRY SYSTEM INOPERATIVECIRCUIT/SYSTEM VERIFICATION
2008 Chevrolet HHR LT, 2.4 P, Automatic
Circuit/System Verification
2008 Chevrolet HHR LT, 2.4 P, AutomaticSECTION Circuit/System Verification
WARNING: This page is about a different car, the 2011 GMC Canyon and 2011 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
- Verify that the transmitter is the correct transmitter for the vehicle.
- If not the correct transmitter, replace the transmitter.
- Place the transmitter on the test pad of the J 43241
and press each button of the transmitter one at a time. The tester should sound a tone and illuminate a green light when each button is pressed.
- If one or more buttons does not sound the tone and illuminate the green light, replace the transmitter battery and retest with the J 43241 . If the condition continues after battery replacement, replace the transmitter.
- Visually inspect the RF antenna. Verify the antenna is routed properly, not damaged, and that the connector is securely connected to the BCM.
- If any damage is noted, replace the antenna.
- Verify the scan tool No. of Fobs Programmed parameter is greater than Fob 0.
- If not greater than the specified value, program the transmitter. Refer to Remote Control Door Lock Transmitter Programming .
- Operate the transmitter while observing the scan tool Door Lock Output and Door Unlock Output parameters. The parameter should correspond with the function selected on the transmitter.
- If the parameter does not match the function selected on the transmitter, program the transmitter and retest. Refer to Remote Control Door Lock Transmitter Programming . If the condition continues after transmitter programming, replace the transmitter.
- With a scan tool, command the door locks to LOCK and UNLOCK.
- If the door locks do not LOCK, test for a short to ground, short to voltage, or an open/high resistance in the Driver Door Lock/ Window Switch LOCK signal circuit.
- If the door locks do not UNLOCK, test for a short to ground, short to voltage, or an open/high resistance in the Driver Door Lock/ Window Switch UNLOCK signal circuit.
- If all circuits test normal, replace the BCM.
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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.