• 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.

For symptom byte information refer to Symptom Byte List

The body control module (BCM) controls the retained accessory power relay through the control circuit by applying voltage to the retained accessory power relay commponents. The retained accessory power relay is energized when the ignition switch is in the ACCESSORY or the ON position.

• The system voltage is between 9–16 V.
• The DTC can only set when the output is actively being requested by the module.

The DTC will set only when the module requests the output and there is a short to ground in the ignition voltage circuit.

The module output driver will be shut down and not supply voltage to the circuit.

• The current DTC will clear when 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.

Power Distribution Schematics

Master Electrical Component List

Retained Accessory Power Description and Operation

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

Control Module References for scan tool information

1. Ignition OFF/Vehicle OFF and all vehicle systems OFF, disconnect the P2 Transmission Shift Lever Position Indicator, the X81 or X81B Accessory Power Receptacle - 110 or 220 V AC and the K188 Human Machine Interface Control Module Bypass Module.
2. Connect a test lamp between each of the ignition circuits listed below and ground.
• P2 Transmission Shift Lever Position Indicator – RAP Relay Switch Control circuit terminal 1
• K188 Human Machine Interface Control Module Bypass Module – RAP Relay Switch Control circuit terminal 2 X1
• X81 Accessory Power Receptacle – 110 V AC – RAP Relay Switch Control circuit terminal 2 X1
• X81B Accessory Power Receptacle – 220 V AC – RAP Relay Switch Control circuit terminal 2 X1
3. Ignition ON/Vehicle in Service Mode.
4. Verify the test lamp turns ON and OFF when commanding the Accessory/Retained Accessory Power Relay On and Off with a scan tool.
• If the test lamp is always OFF
1. Ignition OFF/Vehicle OFF, remove test lamp, disconnect the harness connector at the K9 Body Control Module.
2. Test for infinite resistance between the ignition circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance.
3. Test for less than 2 Ω in the control circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, replace the K9 Body Control Module.
• If the test lamp is always ON
1. Ignition OFF/Vehicle OFF, remove the test lamp, disconnect the harness connector at the K9 Body Control Module, ignition ON/Vehicle in Service Mode.
2. Test for less than 1 V between the control circuit and ground.
• If 1 V or greater, repair the short to voltage on the circuit.
• If less than 1 V, replace the K9 Body Control Module.
• If the test lamp turns ON and OFF
5. Test or replace the appropriate component: P2 Transmission Shift Lever, X81 Accessory Power Receptacle – 110 V AC or X81B Accessory Power Receptacle – 220 V AC.

Perform the Diagnostic Repair Verification after completing the repair.

• Electrical Relay Replacement
• Control Module References for body control module replacement, programming and setup.