Diagnostic Instructions
| • | 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. |
DTC Descriptor
DTC B1475 00: Retained Accessory Power CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Accessory Voltage | B1475 00 | 1 | 2 | -- |
| ||||
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 (RAP) Description and Operation for more detail on RAP operation.
Conditions for Running the DTC
| • | The system voltage is between 9-16 volts. |
| • | The DTC can only set when the output is actively being requested by the module. |
Conditions for Setting the DTC
The DTC will set only when the module requests the output and there is a short to ground detected in the RAP supply voltage circuit.
Action Taken When the DTC Sets
The BCM output driver will be shut down and not supply voltage to the circuit.
Conditions for Clearing the DTC
| • | The current DTC will clear when the module request for the output is removed or the malfunction is no longer present. |
| • | A history DTC clears when the module ignition cycle counter reaches the reset threshold of 50, without a repeat of the malfunction. |
Diagnostic Aids
| • | The RAP/Spare relay is permanently soldered to the left I/P junction block and is non-serviceable. |
| • | The RAP mode for the radio and door modules is a separate function and will still operate properly. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Retained Accessory Power (RAP) Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Ignition ON, verify DTC B1475 is set as current.
- Disconnect each of the following components one at a time. The components may be disconnected in any order. After each component is disconnected, cycle the ignition and verify DTC B1475 remains set as current.
- With all components disconnected, cycle the ignition and verify DTC B1475 is not set as current.
| ⇒ | If DTC B1475 is not set as current, operate the vehicle within the Conditions for Setting the DTC. |
Important: When cycling the ignition, keep ignition OFF for 5 seconds before checking for current DTC.
| • | Sunroof module (with RPO CF5) |
| • | Mobile radio relay A (with RPO 9L4) |
| ⇒ | If DTC B1475 does not remain set as current, test or replace the last component that was disconnected. |
| ⇒ | If DTC B1475 remains set as current, test the accessory voltage circuit for a short to ground. If the circuit tests normal, replace the BCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for module replacement, setup, and programming |
