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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1112 (Retained Accessory Power System) >> Diagnostic Information and Procedures >> Retained Accessory Power (RAP) Inoperative

Retained Accessory Power (RAP) Inoperative

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Retained Accessory Power (RAP) Inoperative

Step Action Yes No
Schematic Reference: Retained Accessory Power (RAP) Schematics 
Connector End View Reference: Master Electrical Component List in Wiring Systems
1 Did you perform the Diagnostic System Check - Retained Accessory Power? Go to Step 2  Go to Diagnostic System Check - Retained Accessory Power 
2
  1. Close the driver and passenger doors.
  2. Turn ON the ignition, with the engine OFF.
  3. Turn OFF the ignition.
Do the retained accessory power functions (power windows, power sunroof) operate normally?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3
  1. Disconnect the RAP relay.
  2. Connect a test lamp between the RAP relay control circuit and the RAP relay ground circuit.
  3. Close the driver and passenger doors.
  4. Turn ON the ignition, with the engine OFF.
  5. Turn OFF the ignition.
Does the test lamp illuminate?		 Go to Step 5  Go to Step 4 
4 Test the RAP relay control circuit and ground circuit for opens. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 7 
5 Connect a test lamp between the RAP relay supply voltage circuit and the RAP relay ground circuit.
Does the test lamp illuminate?		 Go to Step 8  Go to Step 6 
6 Repair the open in the RAP relay supply voltage circuit.
Did you complete the repair?		 Go to Step 11  -
7 Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 10 
8 Test the RAP relay output circuit for a short to ground or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 9 
9 Replace the RAP relay.
Did you complete the replacement?		 Go to Step 11  -
10
IMPORTANT: Perform the set up procedure for the new BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.
Replace the BCM. Refer to Body Control Module Replacement in Body Control System.Did you complete the replacement?		 Go to Step 11  -
11 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 3 
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