• | 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 |
---|---|---|---|---|
Retained Accessory Power (RAP) Supply Voltage Circuit | B1477, 1 | 1 | 2 | -- |
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The body control module (BCM) controls the sunroof motor operation through the retained accessory power (RAP) supply voltage circuit. When the ignition switch is in either the ACC or the ON position, the BCM provides battery voltage to the RAP supply voltage circuit. When the ignition switch turns from ON or ACC to OFF, with all of the vehicle doors closed, the BCM still provides battery voltage to the circuit for 10 minutes, or until any vehicle door opens.
• | Ignition switch is in ACC or ON. |
• | The vehicle was remote started. |
• | The vehicle is in RAP mode. |
• | A short to voltage on the retained accessory power (RAP) supply voltage circuit would cause DTC B1477 to set, and an inoperative sunroof. |
• | An open/high resistance in the retained accessory power (RAP) supply voltage circuit will cause an inoperative sunroof. |
• | A short to voltage on the retained accessory power (RAP) supply voltage circuit would cause the RAP function to remain on past the designated time. |
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 DTC B1477 is current, refer to Diagnostic Trouble Code (DTC) List - Vehicle. |
Important: Verify that the interior lamps defeat switch is not activated.
⇒ | If the courtesy lamp operation is incorrect, refer to Courtesy Lamps Malfunction . |
⇒ | If the test lamp illuminates, test the ignition circuit for a short to voltage. If the circuit tests normal, test or replace the BCM |
⇒ | If the test lamp does not illuminate, test the ignition circuit for a short open/high resistance. If the circuit tests normal, test or replace the BCM |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM replacement, setup, and programming |