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For 1990-2009 cars only
Makes 🢒 Buick 🢒 2005 🢒 Rainier 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Retained Accessory Power (RAP) On After Timeout

Retained Accessory Power (RAP) On After Timeout Except XUV

Step

Action

Yes

No

Schematic Reference: Retained Accessory Power (RAP) Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

Answer No to the question below if the vehicle is not provided with a retained accessory power (RAP) relay.

Do only the devices powered by the RAP relay exhibit this symptom?

Go to Step 5

Go to Step 3

3
  1. Observe the following parameters in body control module (BCM), driver door module (DDM), passenger door module (PDM) and liftgate control module (LGM) data list:
    2. • Left Rear Door Ajar Sw.
    • Right Rear Door Ajar Sw.
    • Door Ajar Switch
    • Liftgate Ajar Switch
    • Liftglass Ajar Switch
  2. Open and close each door while observing the respective parameter.

Does the scan tool display change from On/Closed to Off/Ajar?

Go to Step 4

Go to Symptoms - Lighting Systems in Lighting Systems

4
  1. Install a scan tool. Select diagnostic circuit check and then class 2 power mode.
  2. Close all the doors.
  3. Turn ON the ignition, with the engine OFF.
  4. Wait 5 seconds then turn the ignition OFF.
  5. Wait the time-out for RAP.

Did the scan tool display the RAP power mode, then time-out and display Off-Awake power mode?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 11

5
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the RAP relay.

Do the devices controlled by the RAP relay operate?

Go to Step 6

Go to Step 7

6

Repair the short to battery in the RAP relay switched output circuit. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

Go to Step 13

--

7
  1. Open any door.
  2. Connect a test lamp across the relay coil circuits of the RAP relay.

Does the test lamp illuminate?

Go to Step 8

Go to Step 9

8

Test the RAP relay control circuit for a short to B+. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 11

9

Inspect for poor connections at the RAP relay. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 10

10

Replace the RAP relay.

Did you complete the replacement?

Go to Step 13

--

11

Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 13

Go to Step 12

12

Replace the BCM. Refer to Control Module References for replacement, setup and programming.

Did you complete the procedure?

Go to Step 13

--

13

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2

Retained Accessory Power (RAP) On After Timeout XUV

Step

Action

Yes

No

Schematic Reference: Retained Accessory Power (RAP) Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2

Do only the power roof and midgate glass exhibit this symptom?

Go to Step 5

Go to Step 3

3
  1. Observe the following parameters in body control module (BCM), driver door module (DDM), passenger door module (PDM) and endgate control module (EGM) data list:
    2. • Left Rear Door Ajar Sw.
    • Right Rear Door Ajar Sw.
    • Door Ajar Switch
    • Lower Left Ajar Switch
    • Upper Left Ajar Switch
    • Upper Right Ajar Switch
  2. Open and close each door while observing the respective parameter.

Does the scan tool display change from On/Closed to Off/Ajar?

Go to Step 4

Go to Symptoms - Lighting Systems in Lighting Systems

4
  1. Install a scan tool. Select diagnostic circuit check and then class 2 power mode.
  2. Close all the doors.
  3. Turn ON the ignition, with the engine OFF.
  4. Wait 5 seconds then turn the ignition OFF.
  5. Wait the time-out for retained accessory power (RAP).

Did the scan tool display the RAP power mode, then time-out and display Off-Awake power mode?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 6

5
  1. Turn OFF the ignition.
  2. Disconnect the BCM.
  3. Turn ON the ignition.
  4. Test the RAP supply voltage circuit for short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 6

6
  1. Turn OFF the ignition.
  2. Disconnect the BCM, if not disconnected.
  3. Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 8

Go to Step 7

7

Replace the BCM. Refer to Control Module References for replacement, setup and programming.

Did you complete the procedure?

Go to Step 8

--

8
  1. Reconnect all disconnected components.
  2. Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 1