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 MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 622 (KEYLESS ENTRY SYSTEM AND REMOTE FUNCTIONS)DIAGNOSTIC INFORMATION AND PROCEDURESKEYLESS ENTRY SYSTEM INOPERATIVE (PASSIVE)CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Circuit/System Testing
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
Passive Transmitter Malfunction
- Place the keyless entry transmitter on the J 43241
and approach the vehicle. Operate the release handle/touch pad. Verify the J 43241
sounds a tone. See Special Tools .
- If the tone does not sound, press each transmitter button one at a time. If the tone still does not sound, replace the transmitter battery and retest with the J 43241 . If the condition continues after battery replacement, replace the keyless entry transmitter. See Special Tools .
- If all circuits test normal, inspect the external antenna connection at the RCDLR. First, gently pull on the coax connector at the module. If the coax comes out, then it wasn't seated properly. Remove and carefully inspect the coax connection for bent blades or a bent center pin. Fix coax connection if necessary and re-seat connector until a "click" is heard. Gently pull on the coax connection to make sure it is seated properly.
- If all circuits test normal, test or replace the RCDLR.
Antenna Circuit Malfunction
- Ignition OFF, disconnect the harness connector at the inoperative keyless entry antenna.
- Ignition ON, verify a test lamp does not illuminate between the signal circuit terminal 1 (door handle) or the signal circuit terminal A (rear compartment) and ground.
- If the test lamp illuminates, test the signal circuit for a short to voltage. If the circuit tests normal, replace the RCDLR.
- Install a DMM between the signal circuit terminal 1 (door handle) or the signal circuit terminal A (rear compartment) and the low reference circuit terminal 2 (door handle) or the low reference circuit terminal B (rear compartment). Set the DMM to capture AC voltage using the MIN MAX function.
- Operate the release handle/touch pad Verify the DMM captured and AC voltage signal.
- If an AC voltage was not captured, test the signal circuit and the low reference circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the RCDLR.
- If all circuits test normal, test or replace the keyless entry antenna.
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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.