GM Service Manual Online
For 1990-2009 cars only

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 Circuit

Diagnostic Fault Information

Circuit

Short to Ground

Open/High Resistance

Short to Voltage

Signal Performance

RAP Relay Coil Control

B1475 00

1

1

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1. Retained Accessory Power (RAP) Malfunction

Circuit/System Description

The body control module (BCM) controls the RUN/ACCY relay through the rap relay coil supply voltage circuit by applying voltage to the coil side of the relay. The RUN/ACCY relay is a PCB relay and is energized when any of the following conditions are true:

    • Ignition switch is in ACC or ON.
    • The vehicle was remote started.
    • The vehicle is in RAP mode.

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 in the rap relay coil supply voltage circuit.

Action Taken When the DTC Sets

The module 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 RUN/ACCY relay is a PCB relay and can only be replaced with the underhood fuse block.

Reference Information

Schematic Reference

Power Moding Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Retained Accessory Power (RAP) Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector X5 at the BCM.
  2. Test for greater than 70 ohms between the RAP/ACCY relay coil control circuit terminal 11 and ground.
  3. If less than the specified range, test the control circuit for a short to ground. If the circuit tests normal, replace the underhood fuse block.
  4. If all circuits test normal, replace the underhood fuse block.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Underhood Electrical Center or Junction Block Replacement
    •  Control Module References for module replacement, setup, and programming