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Test B: Retained Accessory Power Inoperative: Testing

WARNING: This page is about a different car, the 2001 GMC Safari and 2001 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
  1. If retained accessory power diagnostic system check has been performed, go to next step. If retained accessory power diagnostic system check has not been performed, go to RETAINED ACCESSORY POWER DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEMS.
  2. Inspect RAP fuse (40-amp) located in fuse box in engine compartment. If fuse is found open (blown), go to step  13 . If no problem is found, go to step.
  3. Close all doors. Turn ignition switch from RUN to OFF positions. With scan tool, observe RAP timer. RAP timer should count down. If timer counted down, go to next step. If timer did not counted down, go to step  11 .
    NOTE: If RAP functions operate normally, RAP concern may be intermittent. For aid in diagnosing intermittents see PROBLEM DIAGNOSIS  under INTERMITTENTS.
  4. Disconnect BCM harness connector C1 (Brown). Using DVOM, check for system voltage between BCM harness connector C1 (Brown) terminal A7 and ground. If voltage exist, go to step  10 . If voltage does not exist, go to next step.
  5. Remove RAP relay, RAP relay is located under left side of dash on data link connector bracket facing cowl, also referred to as Relay Block No. 2 see Figure . Check for system voltage at relay, connector terminal No. 2. Red wire (circuit No. 742). If voltage exist, go to step  7 . If voltage does not exist, go to next step.
  6. Check for open in RAP relay control circuit, Red wire (circuit No. 742). If problem is found, repair as necessary. Go to step  14 .
  7. Repair open in Red wire between underhood fuse junction block harness connector C4 terminal A2 and RAP relay socket connector No. 42. After repairs are made, go to step  12 .
  8. Check for poor, loose or corroded connections at BCM harness connectors. If no problem is found, go to step  11 . If problem is found, repair as necessary and go to step  12 .
  9. Replace RAP relay. After repairs are made, go to step  14 .
  10. Disconnect BCM harness connector C1 (Brown). Using a fused jumper wire, jumper between BCM harness connector C1 (Brown) terminal A7 and ground. If RAP functions operate normally, go to next step. If RAP functions do not operate normally, go to step  9 .
  11. Check for poor, loose or corroded connections at all three BCM harness connectors. If no problem is found, go to next step. If a problem is found, repair as necessary and go to step  14 .
  12. Replace BCM see BODY CONTROL MODULE  under REMOVAL & INSTALLATION. After repair are made, program body control module. See PROGRAMMING  . After programming, go to step  14 .
  13. Repair short to ground in battery positive voltage circuit, Red wire (circuit No. 742) between RAP relay terminal No. 2 and RAP fuse (40-amp). After circuit is repaired, replace RAP fuse (40-amp). Go to next step.
  14. Operate RAP system to verify repair. If no problem is found, testing is complete. If problem is found, go to step  2 .
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