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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 Sunshade - Left

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 Programming and Relearning for scan tool information

Circuit/System Verification

1. Ignition ON.

2. Verify the KR70 auxiliary power relay turns ON and OFF when commanding the accessory/retained accessory power relay ON and OFF with a scan tool.

• If the KR70 auxiliary power relay does not turn ON and OFF
Refer to Circuit/System Testing

• If the KR70 auxiliary power relay turns ON and OFF

3. All OK.

Circuit/System Testing

1. Ignition OFF and all vehicle systems OFF, disconnect the KR70 auxiliary power 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 85 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 87 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 KR70 auxiliary power relay.

• If the test lamp illuminates

5. Connect a test lamp between the control circuit terminal 86 and the ground circuit terminal 85.

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 KR70 auxiliary power 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 - E32 cigarette lighter receptacle

* Ignition circuit terminal A - X80F accessory power receptacle - front

• 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 - E32 cigarette lighter receptacle

* Ignition circuit terminal A - X80F accessory power receptacle - front

• 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 KR70 auxiliary power relay.

• If the test lamp illuminates

11. Test or replace the X80 accessory power receptacle.

Component Testing

Relay Test

1. Ignition OFF, disconnect the KR70 auxiliary power relay.

2. Test for 70-150 ohms between terminals 85 and 86.

• 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:

* 30 and 86

* 30 and 87

* 30 and 85

* 85 and 87

• If less than infinite resistance
Replace the relay.

• If infinite resistance

4. Test for less than 5.0 ohms between terminals 30 and 87.

• 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 85 and 12 V. Install a jumper wire between relay terminal 86 and ground.

6. Test for less than 5.0 ohms between terminals 30 and 87.

• 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 Programming and Relearning for the appropriate module replacement, programming and setup.

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