Retained Accessory Power Malfunction
Retained Accessory Power Malfunction
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The retained accessory power (RAP) system allows specific vehicle functions to operate after the ignition is turned OFF for a predetermined time. The RAP relay is internal to the BCM. Relay RAP is controlled by the BCM using inputs from the door ajar switches to determine control of the relay when the ignition is turned OFF. Radio RAP is controlled by a serial data message from the BCM using inputs from the driver door open switch. Refer to Retained Accessory Power Description and Operation Retained Accessory Power for more detail on RAP operation.
Diagnostic Aids
Window and radio RAP functions are separate RAP functions controlled by serial data messages and the specific module. These functions are not effected by the BCM internal RAP relay circuit.
Reference Information
Schematic Reference
Power Moding Schematics Power Moding Schematics
Connector End View Reference
Component Connector End Views Connector End Views By Name
Description and Operation
Retained Accessory Power Description and Operation Retained Accessory Power
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Programming and Relearningfor scan tool information
Circuit/System Verification
Note: Battery voltage must remain above 9.6 V for RAP to operate properly.
Radio RAP
1. With all passenger doors closed, observe the courtesy lamps while opening and closing the driver door. The courtesy lamps should illuminate when the door is opened and turn off approximately 30 seconds after closing the door.
• If the courtesy lamp operation is incorrect from the drivers door, refer to Courtesy Lamps Malfunction Courtesy Lamps Malfunction.
2. If courtesy lamp operation is correct, and the radio is the only RAP concern, replace the radio.
Relay RAP
1. Ignition ON, observe the following scan tool parameters in the BCM while opening and closing each vehicle door. The reading should change appropriately between Door Closed/Door Ajar.
* Driver Door Ajar Sw.
* Left Rear Door Ajar Sw.
* Passenger Door Ajar Sw.
* Right Rear Door Ajar Sw.
• If any parameter does not change as specified, refer to Door Ajar Indicator Malfunction Door Ajar Indicator Malfunction.
2. Command the scan tool Accy/RAP Relay OFF. Attempt to operate any RAP relay controlled component within 5 seconds. The component should not operate.
3. Command the scan tool Accy/RAP Relay ON. Attempt to operate any RAP relay controlled component within 5 seconds. The component should operate.
4. Ignition ON, all doors closed. Observe the scan tool parameter Accy/RAP Relay Command. Ignition OFF, key removed, the reading should remain ON for approximately 10 minutes then change to OFF.
• If the parameter does not respond as specified, replace the BCM.
Circuit/System Testing
1. Ignition OFF, disconnect harness connector X2 of the right I/P junction block.
2. Connect a test lamp between the accessory voltage circuit terminal B3 (component side) and ground.
3. Command the scan tool Accy/RAP Relay ON and OFF. the test lamp should cycle on and off as appropriate.
• If the test lamp is always ON, test the accessory voltage circuit for a short to voltage. If the circuit tests normal, replace the BCM.
• If the test lamp is always OFF, test the accessory voltage circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
4. If equipped with a sunroof, connect a test lamp between the accessory voltage circuit terminal B3 (harness side) and ground. The test lamp should not illuminate.
• If the test lamp illuminates, test the accessory voltage circuit for a short to voltage.
5. If all circuits test normal, replace the BCM.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Control Module References Programming and Relearningfor module replacement, setup, and programming