Volt

Retained Accessory Power Malfunction

The retained accessory power (RAP) system allows specific vehicle functions to operate after the vehicle enters the Vehicle Off power mode 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 vehicle enters the Vehicle Off power mode. 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. Vehicle in Service Mode, observe the Driver's Door Ajar Switch scan tool parameter while opening and closing each vehicle door. The reading should change between Inactive/Active.

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

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

Relay Retained Accessory Power

1. Vehicle in Service Mode, observe the Driver's Door Ajar Switch scan tool parameter while opening and closing each vehicle door. The reading should change between Inactive/Active.

⇒	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 seconds. 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 seconds. The component should operate.
4. Vehicle in Service Mode, all doors closed. Observe the scan tool parameter Accessory/Retained Accessory Power Relay Command. Vehicle Off, transmitter out of range, the reading should be Active for approximately 10 minutes then change to Inactive.

⇒	If the parameter does not respond as specified, replace the K9 body control module.

Accessory Power Receptacle or Cigarette Lighter Malfunction

1. Vehicle OFF, disconnect the KR76 retained accessory power relay.
2. Test for less than 10 Ω between the ground circuit terminal 1 and earth.

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

3. Verify that a test lamp does not illuminate between the control circuit terminal 2 and ground.

⇒	If the test lamp illuminates, test the control circuit for a short to voltage.

4. Vehicle in Service Mode, verify that a test lamp illuminates between the ignition circuit terminal 2 and earth.

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

5. Verify that a test lamp illuminates between the B+ circuit terminal 5 and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the control circuit terminal 3 for a short to ground.

6. Disconnect the harness connector at the inoperative X80 accessory power receptacle or E32 cigarette lighter.
7. Test for less than 10 Ω between the ground circuit terminal C and ground.

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

8. Connect the harness connector at the X80 accessory power receptacle or E32 cigarette lighter.
9. Connect a 20 A fused jumper wire between the KR76 Retained Accessory Power relay B+ circuit terminal 5 and the control circuit terminal 3. Verify that the accessory has power.

⇒	If the accessory does not have power, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the appropriate X80 accessory power receptacle or E32 cigarette lighter.

10. If all circuits test normal, test or replace the KR76 retained accessory power relay.

Relay Test

1. Vehicle OFF, disconnect the KR76 retained accessory power relay.
2. Test for 60-180 Ω between terminals 85 and 86.

⇒	If not within the specified range, replace the 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 relay.

4. Install a 20 A fused jumper wire between relay terminal 85 and 12 V. Install a jumper wire between relay terminal 86 and ground. Test for less than 2 Ω between terminals 30 and 87.

⇒	If greater than specified range, replace the relay.

Perform the Diagnostic Repair Verification after completing the repair.