GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1998 🢒 Regal 🢒 Body and Accessories 🢒 Retained Accessory Power 🢒 Retained Accessory Power (RAP) Inoperative

Step

Action

Value(s)

Yes

No

1

Are the radio, the power windows and the power sunroof (if equipped) inoperative with the ignition switch in the RUN position?

--

Go to Step 2

Go to Step 3

2

Was the BCM Diagnostic System Check performed?

--

Go to Step 3

Go to Diagnostic System Check - Body Control System in Body Control System

3

Inspect the IGN 2 MaxiFuse® located in the underhood accessory wiring junction block.

Is the IGN 2 MaxiFuse® open?

--

Go to Step 4

Go to Step 5

4
  1. Replace the IGN 2 MaxiFuse®.
  2. Inspect the IGN 2 MaxiFuse® again.

Is the IGN 2 MaxiFuse® open again?

--

Go to Step 9

Go to Step 5

5

Using a test light, connect between the RAP relay harness connector  terminal A2 and ground.

Is the test light on?

--

Go to Step 6

Go to Step 10

6

Connect a 60A fused jumper between the RAP relay harness connector terminals A2 and C1.

Upon connecting fused jumper, does the fused jumper open?

--

Go to Step 11

Go to Step 7

7
  1. Leave the fused jumper connected from previous step.
  2. Test the operation of the radio and power windows.

Do the radio and the power windows operate?

--

Go to Step 8

Go to Step 12

8
  1. Disconnect the BCM connector C1.
  2. Reconnect the RAP relay.
  3. Using a 10A fused jumper, connect between the BCM harness connector C1 terminal C5 and ground.
  4. Test the operation of the radio and power windows.

Do the radio and the power windows operate?

--

Go to Step 13

Go to Step 14

9

Repair short to ground in circuit 142.

Is the repair complete?

--

Go to Step 15

--

10

Repair a poor connection or an open in circuit 142.

Is the repair complete?

--

Go to Step 15

--

11

Repair short to ground in circuit 75.

Is the repair complete?

--

Go to Step 15

--

12

Repair a poor connection or an open in circuit 75.

Is the repair complete?

--

Go to Step 15

--

13
  1. Replace the BCM. Refer to Body Control Module Replacement in Body Control System.
  2. After BCM replacement, perform the Setup New BCM procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Is the repair complete?

--

Go to Step 15

--

14

Replace the RAP relay.

Is the repair complete?

--

Go to Step 15

--

15
  1. Turn the ignition switch to the LOCK position.
  2. Reinstall connectors/components removed.

Is the repair complete?

--

Go to Retained Accessory Power (RAP) System Check

--

16

Using a Scan Tool , go to the input screen and open and close all of the doors.

Does the input status change from off to on when opening and closing each door?

--

Go to Step 17

Go to Step 18

17
  1. Turn off the IP dimmer switch.
  2. Turn off the left and right roof rail courtesy/reading lamps.
  3. Turn off the inside rearview courtesy/reading lamps.
  4. Turn the ignition switch to the RUN position.
  5. Observe the interior courtesy lights, and close all the vehicle doors.

Are the interior courtesy lights off?

--

Go to Step 13

Go to Step 19

18
  1. Disconnect the BCM connector C1.
  2. Ensure that all of the doors are closed.
  3. Using a test light, probe between the BCM connector C1 terminal C16 and B+.

Does the test light illuminate?

--

Go to Step 20

Go to Step 21

19

Refer to Courtesy or Dome Lamps Always On in Lighting Systems.

Is the repair complete?

--

Go to Step 15

--

20

Repair a short to ground in circuit 727.

Is the repair complete?

--

Go to Step 15

--

21

Using a test light probe the BCM connector C1 terminal D16 and B+.

Does the test light illuminate?

--

Go to Step 22

Go to Step 19

22

Repair a short to ground in circuit 49.

Is the repair complete?

--

Go to Step 15

--