GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you review the system operation and perform the necessary inspections?

--

Go to Step 2

Go to Symptoms - Body Control System

2

Attempt to enter the BCM diagnostic mode. Refer to Diagnostic Trouble Code (DTC) Displaying .

Does the BCM enter the diagnostic mode?

--

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

Go to Step 3

3

Turn the ignition switch to the RUN position.

Does the SECURITY indicator illuminate during the BULB TEST?

--

Go to Step 4

Go to SECURITY Indicator Inoperative in Theft Deterrent

4

Attempt to operate the courtesy lamps.

Do the courtesy lamps operate normally?

--

Go to Step 5

Go to Step 8

5

  1. Disconnect the BCM connector C2.
  2. Remove the RADIO Fuse 17 from the IP Fuse Block.
  3. Connect a test lamp from connector C2 terminal C to battery voltage. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 6

Go to Step 7

6

Repair the short to ground in circuit 75. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 20

--

7

Test for and repair an open in circuit 43. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and repair an open?

--

Go to Step 20

Go to Step 19

8

  1. Disconnect the BCM connector C2.
  2. Connect a test lamp between the BCM connector C2 terminal A and battery voltage. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 9

Go to Step 10

9

  1. Disconnect the BCM connector C3.
  2. Connect a test lamp between the BCM connector C3 terminal C1 and battery voltage. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 11

Go to Step 10

10

Repair an open in circuit 650. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 20

--

11

Connect a test lamp between the BCM connector C2 terminal B and ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 12

Go to Step 15

12

  1. Turn the ignition switch to the RUN position.
  2. Connect a test lamp between the BCM connector C3 terminal D5 and ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 13

Go to Step 16

13

  1. Leave the ignition in the RUN position.
  2. Connect a test lamp between BCM connector C2 terminal D and ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 14

Go to Step 17

14

Connect a test lamp between the BCM connector C2 terminal F and ground. Refer to Circuit Testing in Wiring Systems.

Does the test lamp illuminate?

--

Go to Step 19

Go to Step 18

15

Repair an open in circuit 40. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 20

--

16

Repair an open in circuit 39. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 20

--

17

Repair an open in circuit 4. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 20

--

18

Repair an open in circuit 102. Refer to Wiring Repairs in Wiring Systems.

Did you complete the repair?

--

Go to Step 20

--

19

Replace the BCM. Refer to Body Control Module Replacement .

Did you complete the replacement?

--

Go to Step 20

--

20

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3