B1475
DTC B1475
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.
DTC Descriptor
DTC B1475 00
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Retained Accessory Power Circuit
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) controls the RAP relay through the RAP relay coil voltage circuit by applying voltage to the coil side of the relay. The RAP relay is energized when any of the following conditions are true:
* Ignition switch is in the ACCESSORY or RUN position.
* The vehicle was remote started.
* The vehicle is in RAP mode.
Conditions for Running the DTC
* The system voltage is between 9-16 V.
* The output is actively being requested by the module.
Conditions for Setting the DTC
The BCM detects a short to ground in the RAP relay coil voltage circuit.
Action Taken When the DTC Sets
The BCM will shut down voltage to the circuit.
Conditions for Clearing the DTC
* The condition responsible for setting the DTC no longer exists.
* A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.
Diagnostic Aids
The radio RAP mode is a separate function and will still operate properly. The radio RAP function is controlled by serial data and the specific module. These functions are not effected by the BCM RAP relay circuits.
Reference Information
Schematic Reference
* Power Distribution Schematics Power Distribution Schematics
* Power Moding Schematics Power Moding Schematics
Connector End View Reference
Component Connector End Views Fuel Pump and Level Sensor Assembly
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 Testing
1. Ignition OFF, disconnect the appropriate RAP relay.
2. Test for less than 5 omhs between the ground circuit terminal 86 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Connect a test lamp between the relay control circuit terminal 85 and ground.
4. Cycle the ignition ON and OFF. The test lamp should turn ON and OFF when changing ignition switch positions.
• If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 body control module.
• If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the K9 body control module.
5. If all circuits test normal, test or replace the RAP relay.
Component Testing
1. Ignition OFF, disconnect the appropriate RAP relay.
2. Test for 70 - 150 omhs between the B+ terminal 85 and the ground terminal 86 of the relay.
• If 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 3 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 omhs between terminals 30 and 87.
• If greater than the specified range, replace the relay.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
Control Module References Control Module References for BCM replacement, setup, and programming.