GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Use a test light in order to backprobe between the inoperative door lock switch terminal B and the ground.

Does the test light illuminate?

--

Go to Step 2

Go to Step 3

2

  1. Inspect for a poor connection at the inoperative door lock switch and C301 left or C302 right.
  2. If the connection is OK, replace the inoperative door lock switch.

Is the repair complete?

--

Go to Step 4

--

3

  1. Inspect C301 left or C302 right for a poor connection.
  2. If the connection is OK, repair the poor connection or an open in CKT 1140 between the inoperative door lock switch and S306.

Is the repair complete?

--

Go to Step 4

--

4

  1. Ensure that the ignition switch is in the LOCK position.
  2. Reconnect any connectors/components removed.

Have all repairs been made?

--

Go to Power Door Locks System Check

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