B1475
DTC B1475
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System
Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an
overview of the diagnostic approach.
* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure
Instructions) provides an overview of each diagnostic category.
DTC Descriptor
DTC B1475 00
- Retained Accessory Power Circuit
Diagnostic Fault Information
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 Description and Operation (See: Power and Ground Distribution/Description and Operation/Retained
Accessory Power 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
Power Moding Schematics (See: Diagrams/Electrical Diagrams/Starting and Charging/Power and Ground Distribution/System Diagram/Power
Moding Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
Retained Accessory Power Description and Operation (See: Power and Ground Distribution/Description and Operation/Retained Accessory Power
Description and Operation)
