LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2000 >> Safari Van Passenger, AWD >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Modules & Data Link Communications System >> Diagnostic Tests >> DTC B1477: Retained Accessory Power (Rap) Circuit Low >> Testing

DTC B1477: Retained Accessory Power (Rap) Circuit Low: Testing

  1. If Body Control Module (BCM) diagnostic system check has been performed, go to next step. If Body Control Module (BCM) diagnostic system check has not been performed, go to BODY CONTROL MODULE (BCM) DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
  2. Connect scan tool to Data Link Connector (DLC), located to left of steering column. Turn ignition on. Using scan tool, command RAP relay on and off. If relay does not turn on and off (click), go to next step. If relay turns on and off (clicks), go to DIAGNOSTIC AIDS .
  3. Turn ignition off. Remove RAP relay from body relay block. Turn ignition on. Using a test light connected to ground, probe relay cavity terminal No. 85. If test light illuminates, go to next step. If test light does not illuminate, go to step  10.
  4. Connect a test light between relay cavity terminals No. 86 and No. 85. Using scan tool, command RAP relay off and on. If test light does not turn on and off, go to next step. If test light turns on and off, go to step  8.
  5. If test light stays off, go to next step. If test light stays on, go to step  7.
  6. Check for open on Black wire between relay block 2 connector terminal No. 1 and BCM connector C1 terminal A7. If circuit is okay, go to step  9. If circuit is open, repair as necessary. After repair, go to step  13.
  7. Check for short to ground on Black wire between relay block 2 connector terminal No. 1 and BCM connector C1 terminal A7. If circuit is okay, go to step  9. If circuit is open, repair as necessary. After repair, go to step  13.
  8. Check RAP relay and cavity terminals for damage and poor connections. If no problem is found, go to step  11. If connections are poor, repair as necessary. After repair, go to step  13.
  9. Check BCM and harness connector terminals for damage and poor connections. If no problem is found, go to step  12. If connections are poor, repair as necessary. After repair, go to step  13.
  10. Repair power feed circuit to RAP relay. See POWER DISTRIBUTION article in WIRING DIAGRAMS. After repair, go to step  13.
  11. Replace RAP relay. After repair, go to step  13.
  12. Replace BCM. See BODY CONTROL MODULE (BCM)  under REMOVAL & INSTALLATION. Program BCM. See BODY CONTROL MODULE (BCM)  under PROGRAMMING. After repair, go to step  13.
  13. Reconnect all disconnected components and connectors. Clear DTCs. Perform BODY CONTROL MODULE (BCM) DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
scientia non olet · About LEMON Manuals