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Test Description

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.

The numbers below refer to the step numbers on the diagnostic table.

  1. 2:  Listen for an audible click when the RAP relay operates. Command both the ON and OFF states. Repeat the commands as necessary.
  2. 3:  Verifies that the BCM is providing voltage to the RAP relay.
  3. 4:  Tests for an open in the ground circuit to the RAP relay.
  4. 5:  Tests if voltage is constantly being applied to the RAP relay.
DTC B1477

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 Retained Accessory Power Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Retained Accessory Power 
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the RAP relay ON and OFF.
Does the RAP relay turn ON and OFF with each command?		 Go to Diagnostic Aids Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the RAP relay.
  3. Turn ON the ignition, with the engine OFF.
  4. Probe the control circuit of the RAP relay with a test lamp connected to a good ground.
  5. With a scan tool, command the RAP relay ON and OFF.
Does the test lamp turn ON and OFF with each command?		 Go to Step 4  Go to Step 5 
4 
  1. Connect a test lamp between the control circuit of the RAP relay and the ground circuit of the RAP relay.
  2. With a scan tool, command the RAP relay ON and OFF.
Does the test lamp turn ON and OFF with each command?		 Go to Step 7  Go to Step 9 
5  Does the test lamp remain illuminated with each command? Go to Step 7  Go to Step 6 
6 Test the control circuit of the RAP relay for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 12  Go to Step 8 
7 Inspect for poor connections at the RAP relay. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 12  Go to Step 10 
8 Inspect for poor connections at the console electrical center connector to the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 12  Go to Step 11 
9 Repair the ground circuit of the RAP relay. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?		 Go to Step 12  -
10 Replace the RAP relay.
Did you complete the replacement?		 Go to Step 12  -
11
  1. Replace the BCM. Refer to Body Control Module Replacement in Body Control System.
  2. Perform the set up procedure for the BCM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.
Did you complete the replacement?		 Go to Step 12  -
12
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
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