Retained Accessory Power Malfunction
Retained Accessory Power Malfunction
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.
Diagnostic Fault Information
Circuit/System Description
The body control module (BCM) controls the retained accessory power relay through the control circuit by applying voltage to the retained accessory power relay coil control circuit. The retained accessory power relay is energized when the ignition switch is in the ACCESSORY or the ON position.
Reference Information
Schematic Reference
Power Distribution Schematics Power Distribution 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 Verification
1. Ignition ON.
2. Verify the KR80 accessory relay turns ON and OFF when commanding the accessory/retained accessory power relay ON and OFF with a scan tool.
• If the KR80 accessory relay does not turn ON and OFF
Refer to Circuit/System Testing
• If the KR80 accessory relay turns ON and OFF
3. All OK.
Circuit/System Testing
1. Ignition OFF and all vehicle systems OFF, disconnect the KR80 accessory relay. It may take up to 2 minutes for all vehicle systems to power down.
2. Test for less than 10 ohms between the ground circuit terminal 13 and ground.
• If 10 ohms or greater
1. Ignition OFF.
2. Test for less than 2 ohms in the ground circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, repair the open/high resistance in the ground connection.
• If less than 10 ohms
3. Ignition ON.
4. Verify a test lamp illuminates between the B+ circuit terminal 14 and ground.
• If the test lamp does not illuminate and the circuit fuse is good
1. Ignition OFF.
2. Test for less than 2 ohms in the B+ circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is OK and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF.
2. Test for infinite resistance between the B+ circuit and ground.
• If less than infinite resistance, repair the short to ground on the circuit.
• If infinite resistance, replace the KR80 accessory relay.
• If the test lamp illuminates
5. Connect a test lamp between the control circuit terminal 11 and the ground circuit terminal 13.
6. 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, disconnect the harness connector at the K9 body control module.
2. Test for infinite resistance between the control 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 ohms in the control circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, replace the K9 body control module.
• If the test lamp is always ON
1. Ignition OFF, disconnect the harness connector at the K9 body control module, ignition ON.
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
7. Ignition OFF, connect the KR80 accessory relay and disconnect the appropriate X80 accessory power receptacle.
8. Verify that a test lamp does not illuminate between each of the ignition circuits listed below and ground.
* Ignition circuit terminal A - X80A accessory power receptacle - center console 1
* Ignition circuit terminal A - X80B accessory power receptacle - center console 2
• If the test lamp illuminates
Repair the short to voltage on the ignition circuit.
• If the test lamp does not illuminate
9. Ignition ON.
10. Verify that a test lamp illuminates between each of the ignition circuits listed below and ground.
* Ignition circuit terminal A - X80A accessory power receptacle - center console 1
* Ignition circuit terminal A - X80B accessory power receptacle - center console 2
• If the test lamp does not illuminate and the circuit fuse is good
1. Ignition OFF.
2. Test for less than 2 ohms in the ignition circuit end to end.
• If 2 ohms or greater, repair the open/high resistance in the circuit.
• If less than 2 ohms, verify the fuse is OK and there is voltage at the fuse.
• If the test lamp does not illuminate and the circuit fuse is open
1. Ignition OFF.
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, test or replace the KR80 accessory relay.
• If the test lamp illuminates
11. Test or replace the X80 accessory power receptacle.
Component Testing
Relay Test
1. Ignition OFF, disconnect the KR80 accessory relay.
2. Test for 70-150 ohms between terminals 11 and 13.
• If less than 70 or greater than 150 ohms
Replace the relay.
• If between 70-150 ohms
3. Test for infinite resistance between the terminals listed below:
* 14 and 11
* 14 and 15
* 14 and 13
* 13 and 15
• If less than infinite resistance
Replace the relay.
• If infinite resistance
4. Test for less than 5.0 ohms between terminals 14 and 15.
• If 5.0 ohms or greater
Replace the relay.
• If less than 5.0 ohms
5. Install a 3 A fused jumper wire between relay terminal 13 and 12 V. Install a jumper wire between relay terminal 11 and ground.
6. Test for less than 5.0 ohms between terminals 14 and 15.
• If 5.0 ohms or greater
Replace the relay.
• If less than 5.0 ohms
7. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Relay Replacement (Within an Electrical Center) Relay Replacement (Within an Electrical Center)Relay Replacement (Attached to Wire Harness) Relay Replacement (Attached to Wire Harness)
* Control Module References Control Module References for the appropriate module replacement, programming and setup.