• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
RAP Relay Coil Supply Voltage | B1475, 1 | 1 | 2 | -- |
Battery Positive Voltage (Relay Output) | 3 | 4 | 2 | -- |
Accessory Voltage (Relay Output) | 3 | 4 | 2 | -- |
Accessory Voltage (Relay Output) | 3 | 4 | 2 | -- |
Ground (RAP Relay) | -- | 1 | -- | -- |
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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 rear fuse block. The relay switched output feeds the RAP, SHFTR SOL, and the S/ROOF fuses within the rear 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 (RAP) Description and Operation for more detail on subsystems using RAP.
• | 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. |
Retained Accessory Power (RAP) Description and Operation
Control Module References for Scan Tool Information
Important: Battery voltage must remain above 9.6 V for RAP to operate properly.
⇒ | If the courtesy lamp operation is incorrect from the drivers door, refer to Courtesy Lamps Malfunction . |
• | BCM - Left Rear Door Ajar Sw. |
• | BCM - Right Rear Door Ajar Sw. |
• | Driver Door Module (DDM) - Driver Door Ajar Sw. |
• | Passenger Door Module (PDM) - Passenger Door Ajar Sw. |
⇒ | If any parameter does not change as specified, refer to Door Ajar Indicator Malfunction . |
⇒ | If the parameter does not respond as specified, replace the BCM. |
⇒ | If greater than specified, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp remains ON all the time, 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 all the time, test the relay coil control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp illuminates, test the following relay output circuits for a short to voltage: |
• | Battery positive voltage |
• | Accessory voltage |
⇒ | If the resistance is not within the specified range, replace the relay. |
• | 30 and 86 |
• | 30 and 87 |
• | 30 and 85 |
• | 85 and 87 |
⇒ | If not the specified value, replace the relay. |
⇒ | If greater than specified, replace the relay. |
Perform the Diagnostic Repair Verification after completing the repair.
• | Control Module References for module replacement, setup, and programming |