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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1638 (RETAINED ACCESSORY POWER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESRETAINED ACCESSORY POWER (RAP) INOPERATIVE
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Retained Accessory Power (RAP) Inoperative

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Retained Accessory Power (RAP) Inoperative
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. 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 
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) operate for approximately 10 minutes?		 System OK Go to Step 3 
3
  1. Turn OFF the ignition.
  2. Remove the RAP relay.
  3. Turn ON the ignition, with the engine OFF.
  4. With a test lamp that is connected to a good ground, probe the battery positive voltage circuits of the RAP relay.
Does the test lamp illuminate on both circuits?		 Go to Step 4  Go to Step 7 
4
  1. Reconnect the RAP relay.
  2. With a test lamp that is connected to a good ground, probe the RAP relay output circuit at the RAP relay.
  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 6 
5 Repair the RAP relay output circuit of the RAP relay. Refer to WIRING REPAIRS .
Did you complete the repair?		 Go to Step 9  -
6 Inspect for poor connections at the RAP relay. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS and CONNECTOR REPAIRS .
Did you find and correct the condition?		 Go to Step 9  Go to Step 8 
7
  1. Repair the battery positive voltage circuit of the RAP relay. Refer to WIRING REPAIRS .
  2. Reconnect the RAP relay.
Did you complete the repair?		 Go to Step 9  -
8 Replace the RAP relay.
Did you complete the replacement?		 Go to Step 9  -
9 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 3 
RENDER: 1.0x

NO RELATED

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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.