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 210 (KEYLESS ENTRY SYSTEM & REMOTE FUNCTIONS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B3122CIRCUIT/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 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the console active antenna.
- Ignition OFF, test for less than 20 ohms of resistance between the low reference circuit terminal 5 and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the RCDLR.
- Ignition ON, test for B+ between the supply voltage circuit terminal 2 and ground while commanding the scan tool Active Antenna output control ON.
- If not the specified value, test the supply voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the RCDLR.
- Ignition OFF, disconnect the X2 harness connector at the RCDLR.
- Ignition ON, verify a test lamp does not illuminate between the following circuits and ground:
- Signal circuit terminal B
- Signal circuit terminal C
- If the test lamp illuminates, test the appropriate signal circuit for a short to voltage.
- Ignition OFF, test for infinite resistance between the following circuits and ground:
- Signal circuit terminal B
- Signal circuit terminal C
- If less than the specified value, test the appropriate signal circuit for a short to ground.
- Test for less than 2 ohms of resistance between the following signal circuits:
- Terminal B at the RCDLR and terminal 3 at the console active antenna
- Terminal C at the RCDLR and terminal 4 at the console active antenna
- If greater than the specified range, test the appropriate signal circuit for an open/high resistance.
- If all circuits test normal, test or replace the console active 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.