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: Retained Accessory Power CircuitDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
|---|---|---|---|
Battery Positive Voltage | B1475 | B1475 | -- |
Rap Relay Control | -- | B1475 | B1475 |
Circuit Description
The body control module (BCM) controls various accessories through the retained accessory power (RAP) relay circuit. When the ignition switch is in either the ACC or the ON position, the BCM grounds the RAP relay control circuit, energizing the RAP relay. When the RAP relay is energized, it supplies a B+ to the various accessories.
When the ignition switch turns from ON or ACC to OFF, with all of the vehicle doors closed, the BCM keeps the relay energized for 10 minutes, or until any vehicle door opens.
Conditions for Running the DTC
The system voltage must be between 9-16 volts.
Conditions for Setting the DTC
| • | The BCM detects a short to voltage in the RAP relay control circuit when the BCM is trying to energize the relay. |
| • | The BCM detects that the RAP relay control circuit is open. |
| • | The condition above must be present for more than 1 second. |
Action Taken When the DTC Sets
| • | The BCM stores DTC B1475 in memory. |
| • | The devices powered by the RAP relay will not operate. |
Conditions for Clearing the DTC
| • | A current DTC clears when the malfunction is no longer present. |
| • | A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction. |
Reference Information
Schematic Reference
Connector End View Reference
Master Electrical Component List
Description and Operation
Retained Accessory Power (RAP) Description and Operation
Electrical Information Reference
Scan Tool Reference
Circuit/System Verification
Ignition ON, command the retained accessory power (RAP relay) ON and OFF with a scan tool. Feel/listen for the operation of the RAP relay.
Circuit/System Testing
- Ignition OFF, disconnect the RAP Relay.
- Verify that a test lamp illuminates between the B+ circuit terminals M3 and ground and between terminals N3 and ground.
- Connect a test lamp between the B+ circuit terminal M3 and the RAP relay control circuit terminal N1.
- Command the RAP relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
- If all circuits test normal, test or replace the RAP relay.
| ⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the accessory voltage circuit terminal M1 for a short to ground. If the circuit tests normal, test or replace the RAP relay. |
| ⇒ | If the test lamp is always ON, test the RAP relay control circuit for a short to ground. If the circuit tests normal, replace the BCM. |
| ⇒ | If the test lamp is always OFF, test the RAP relay control circuit for a short to voltage or an open/high resistance. 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 |
