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 MANUALSCHEVROLET2002AVALANCHE 2500, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 23 (REMOTE KEYLESS ENTRY SYSTEM)SYSTEM TESTSTEST A: KEYLESS ENTRY SYSTEM INOPERATIVE
2002 Chevrolet Avalanche 2500, RWD
Test A: Keyless Entry System Inoperative
2002 Chevrolet Avalanche 2500, RWDSECTION Test A: Keyless Entry System Inoperative
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet Chevy Express, and 2001 GMC Savana Special. However, it is still accessible from the selected car via links, so may be relevant.
- Check operation of keyless entry system. See OPERATION . Go to next step.
- Press each button on transmitter. If keyless entry system does not operate correctly, go to next step. If keyless entry system operates correctly, check for intermittent problem. Check all applicable component connections. See COMPONENT LOCATIONS and WIRING DIAGRAMS .
- Lock and unlock door locks using controls inside vehicle. If system operates correctly, go to next step. If system does not operate correctly, see appropriate POWER DOOR LOCKS article.
- Test transmitter operation. See TRANSMITTER TEST under COMPONENT TESTS. If tone sounds and Green light illuminates on keyless entry tester when each button is pressed, go to step 9 . If transmitter does not operate as specified, go to next step.
- If none of the buttons on transmitter cause tester tone to sound and Green light to illuminate on keyless entry tester, go to next step. If at least one button on transmitter causes tester tone to sound and Green light to illuminate on keyless entry tester, go to step 8 .
- Replace transmitter battery. Go to next step.
- Test transmitter operation. See TRANSMITTER TEST under COMPONENT TESTS. If tone sounds and Green light illuminates on keyless entry tester when each button is pressed, go to step 9 . If transmitter does not operate as specified, go to next step.
- Replace transmitter, then go to step 11 .
- Perform resynchronization procedure. See TRANSMITTER RESYNCHRONIZATION under PROGRAMMING. If door locks cycle, go to next step. If door locks do not cycle, go to step 11 .
- Press each button on transmitter. If keyless entry system does operate correctly, go to next step. If keyless entry system operates correctly, go to step 15 .
- Program all transmitters. See TRANSMITTER PROGRAMMING under PROGRAMMING. If door locks cycle, go to step 15 . If door locks do not cycle, go to next step.
- Turn ignition off. Disconnect RCDLR connector. RCDLR is attached to cowl above engine cover. Check battery voltage circuits at terminals "E" and "F" on RCDLR connector for open or short to ground. See Figure . See WIRING DIAGRAMS . Repair as necessary. After repair, go to step 15 . If both circuits are okay, go to next step.
- Check continuity of ground circuit at terminal "N" on RCDLR connector. If continuity exists, go to next step. If continuity does not exist, repair open circuit. After repair, go to step 15 .
- Replace RCDLR. Program all transmitters. See TRANSMITTER PROGRAMMING under PROGRAMMING. Go to next step.
- Press each button on transmitter. If keyless entry system does not operate correctly, go to step 2 . If keyless entry system operates correctly, repair is complete.
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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.