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Retained Accessory Power Malfunction

The retained accessory power system allows specific vehicle functions to operate after the ignition is turned OFF for a predetermined time. Relay retained accessory power is controlled by the body control module (BCM) using inputs from the door ajar switches to determine control of the relay when the ignition is turned OFF. Radio retained accessory power 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 for more detail on subsystems using retained accessory power.

The radio retained accessory power mode is a separate function and will still operate properly. The radio retained accessory power function is controlled by serial data and the specific module. These functions are not affected by the BCM retained accessory power relay circuits.

Schematic Reference

Connector End View Reference

Component Connector End Views

Description and Operation

Retained Accessory Power Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

Note: Battery voltage must remain above 9.6 V for retained accessory power to operate properly.

Radio Retained Accessory Power

1. With all passenger doors closed, observe the courtesy lamps while opening and closing the driver door. The courtesy lamps should illuminate when the door is opened and turn off approximately 30 seconds after closing the door.

⇒	If the courtesy lamp operation is incorrect from the drivers door, refer to Courtesy Lamps Malfunction .

2. If courtesy lamp operation is correct, and the radio is the only retained accessory power concern, replace the radio.

Relay Retained Accessory Power

1. Ignition ON, observe the appropriate scan tool parameters listed below while opening and closing each vehicle door. The reading should change between Door Closed/Door Ajar.

•	Driver Door Ajar Switch

•	Left Rear Door Ajar Switch

•	Passenger Door Ajar Switch

•	Right Rear Door Ajar Switch

⇒	If any parameter does not change as specified, refer to Door Ajar Indicator Malfunction .

2. Command the scan tool Accessory/Retained Accessory Power Relay Command OFF. Attempt to operate any retained accessory power relay controlled component within 5 s. The component should not operate.
3. Command the scan tool Accessory/Retained Accessory Power Relay Command ON. Attempt to operate any retained accessory power relay controlled component within 5 s. The component should operate.
4. Ignition ON, all doors closed. Observe the scan tool parameter Accessory/Retained Accessory Power Relay Command. Ignition OFF, key removed, the reading should be ON for approximately 10 minutes then change to OFF.

⇒	If the parameter does not respond as specified, replace the K9 Body Control Module.

1. Ignition OFF, disconnect the KR70 Auxiliary Power Relay.
2. Test for less than 5 Ω between the ground control circuit terminal 1 and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

3. Verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.

⇒	If the test does not illuminate, test the B+ circuit for short to ground or an open/high resistance.

4. Connect a test lamp between the control circuit terminal 2 and the ground circuit terminal 1.
5. Command the Retained Accessory Power/ACCY relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the command states.

⇒	If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the K9 Body Control Module.

⇒	If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K9 Body Control Module.

6. Connect the Retained Accessory Power/ACCY relay. Disconnect the harness connector at the centre console accessory power outlet.
7. Connect a test lamp between the ignition circuit terminal A and ground.
8. Command the Retained Accessory Power/ACCY relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the command states.

⇒	If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, test or replace the KR70 Auxiliary Power Relay.

⇒	If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the KR70 Auxiliary Power Relay.

Relay Test

1. Ignition OFF, disconnect the KR70 Auxiliary Power Relay.
2. Test for 70-150 Ω between terminals control circuit terminal 1 and ground terminal 2.

⇒	If not within the specified range, replace the KR70 Auxiliary Power Relay.

3. Test for infinite resistance between the following terminals:

•

30 and 86

•

30 and 87

•

30 and 85

•

85 and 87

⇒	If not the specified value, replace the KR70 Auxiliary Power Relay.

4. Install a 2 A fused jumper wire between relay terminal 2 and 12 V. Install a jumper wire between relay terminal 1 and ground. Test for less than 5 Ω between terminals 30 and 87.

⇒	If greater than the specified range, replace the KR70 Auxiliary Power Relay.

Perform the Diagnostic Repair Verification after completing the repair.