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 Instructions provides 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 located in the body fuse block. The relay switched output feeds the power window circuit breaker within the body fuse block. 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 subsystems using RAP.
Diagnostic Aids
* The radio and window RAP function are separate RAP functions controlled by serial data and the specific module. These functions are not effected by the BCM RAP relay circuits.
* A short to ground or open/high resistance in the RAP relay switched voltage circuits will cause only part of the RAP functions to be inoperative. Diagnose these symptoms within the respective system sections.
* A short to voltage on the RAP relay control or switched voltage circuits would cause the RAP function to remain on past the designated time.
* A stuck relay switch could cause a RAP always on, or a RAP inoperative condition.
Reference Information
Schematic Reference
* Power Moding Schematics Power Moding Schematics
* Moveable Window Schematics Electrical Diagrams
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
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 Control Module References for Scan Tool Information
Circuit/System Verification
Important:
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 each scan tool Door Open Sw. parameter while opening and closing each vehicle door. The reading should change appropriately indicating the door is open or closed.
• If any parameter does not change as specified, refer to Courtesy Lamps Malfunction Courtesy Lamps 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 be 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 the RAP Relay.
2. Test for less than 2 ohms of resistance between ground circuit terminal and ground.
• If greater than specified, test the ground circuit for an open/high resistance.
3. Connect a test lamp between control circuit terminal and ground.
4. With the driver and passenger doors open, cycle the ignition key ON and OFF. The test lamp should turn ON and OFF when cycling the ignition switch.
• If the test lamp remains ON at all times, test the relay coil control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
• If the test lamp remains OFF at all times, test the relay coil control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM.
5. Connect a test lamp between the relay output voltage circuit terminal and ground. The test lamp should not illuminate.
• If the test lamp illuminates, test the relay output circuits for a short to voltage:
6. If all circuits test normal, test or replace the RAP relay.
Component Testing
Relay Test
1. Ignition OFF, disconnect the RAP relay.
2. Test for 70-110 ohms of resistance between terminals 85 and 86.
• If the resistance is not within the specified range, replace the relay.
3. Test for infinite resistance between the following terminals:
* 30 and 86
* 30 and 87
* 30 and 85
* 85 and 87
• If not the specified value, replace the relay.
4. Install a 20 amp fused jumper wire between relay terminal 85 and 12 volts. Install a jumper wire between relay terminal 86 and ground. Test for less than 5.0 ohms of resistance between terminals 30 and 87.
• If greater than specified, replace the relay.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)
* Control Module References Control Module References for module replacement, setup, and programming