GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Backprobe with a test lamp between the body control module (BCM) connector C2 terminal B and ground.

Does the test lamp light?

--

Go to Step 2

Go to Step 5

2

  1. Disconnect the left door lock switch connector.
  2. With a test lamp connected to the left door lock switch connector terminal A, backprobe BCM connector C2 terminal B.

Does the test lamp light?

--

Go to Step 4

Go to Step 3

3

Repair the open in CKT 750, between G200 and S220.

Is the repair complete?

--

System OK

--

4

  1. Reconnect the left door lock switch connector.
  2. Using a test lamp, backprobe between BCM connector C1 terminal B and ground.
  3. While observing the test lamp, move the left door lock switch to the LOCK position.

Does the test lamp light?

--

Go to Step 6

Go to Step 7

5

Repair the open in circuit  40.

Is the repair complete?

--

System OK

--

6

Repair the open in CKT 295, between the BCM and S504.

Is the repair complete?

--

System OK

--

7

  1. Test BCM connector C2 terminal B for a poor connection.
  2. Test BCM connector C1 terminal B for a poor connection.
  3. If the connections are OK, replace the BCM. Refer to Body Control Module Replacement .

Is the repair complete?

--

System OK

--