GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Century (China) (CNG) 🢒 Body and Accessories 🢒 Retained Accessory Power 🢒 Retained Accessory Power (RAP) Inoperative

Step

Action

Value(s)

Yes

No

1

Are the radio and power windows 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 4

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

3

Did you perform the BCM Diagnostic System Check?

--

Go to Step 17

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

4

Check fuse 8 located in the underhood accessory wiring junction block.

Is fuse 8 open?

--

Go to Step 5

Go to Step 6

5
  1. Replace fuse 8
  2. Check fuse 8 again.

Is fuse 8 open again?

--

Go to Step 10

Go to Step 6

6

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

Is the test light on?

--

Go to Step 7

Go to Step 11

7

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 12

Go to Step 8

8
  1. Leave the fused jumper connected from previous step.
  2. Check the operation of the radio and power windows.

Do the radio and the power windows operate?

--

Go to Step 9

Go to Step 13

9
  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. Check the operation of the radio and power windows.

Do the radio and the power windows operate?

--

Go to Step 14

Go to Step 15

10

Repair short to ground in circuit 142.

Has the repair been made?

--

Go to Step 16

--

11

Repair a poor connection or an open in circuit 142.

Has the repair been made?

--

Go to Step 16

--

12

Repair short to ground in circuit 75.

Has the repair been made?

--

Go to Step 16

--

13

Repair a poor connection or an open in circuit 75.

Has the repair been made?

--

Go to Step 16

--

14
  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.

Has the repair been made?

--

Go to Step 16

--

15

Replace the RAP relay.

Has the repair been made?

--

Go to Step 16

--

16
  1. Turn the ignition switch to the LOCK position.
  2. Reinstall connectors/components removed.

Have all the repairs been made?

--

Refer to Retained Accessory Power (RAP) System Check

--

17

Using a Tech 2 go to the input screen and open and close all the doors.

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

--

Go to Step 18

Go to Step 19

18
  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 14

Go to Step 20

19
  1. Disconnect the BCM connector C1.
  2. Make sure all 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 21

Go to Step 22

20

Refer to Courtesy Lamps Always On in Lighting Systems.

Has the repair been made?

--

Go to Step 16

--

21

Repair a short to ground in circuit 727.

Has the repair been made?

--

Go to Step 16

--

22

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

Does the test light illuminate?

--

Go to Step 23

Go to Step 20

23

Repair a short to ground in circuit 49.

Has the repair been made?

--

Go to Step 16

--