GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Place the key into the ignition switch.
  2. Turn the ignition switch to the OFF position.
  3. Close the passenger door and the rear compartment lid.
  4. Open the driver door.

Are the courtesy lamps ON?

--

Go to Step 2

Go to Courtesy Lamps Inoperative with Doors Open .

2

  1. Disconnect the BCM connector C3.
  2. Use a DMM to test the continuity between the BCM connector C3 terminal C14 and ground.

Is there continuity?

0 ohms

Go to Step 3

Go to Step 4

3

  1. Test for a poor connection at the BCM connector C3.
  2. If the connection is OK, replace the BCM. Refer to Body Control Module Replacement .

Is the repair complete?

--

System OK

--

4

  1. Disconnect connector C216.
  2. Use a DMM to test the continuity between connector C216 terminal E and ground.

Is there continuity?

--

Go to Step 6

Go to Step 5

5

Repair the open in circuit 650, between the ignition key warning switch and S216.

Is the repair complete?

--

System OK

--

6

  1. Test for a poor connection at connector C216 terminal E.
  2. Test for an open in circuit 80, between the ignition key warning switch and the BCM.
  3. If OK, replace the ignition key warning switch. Refer to Ignition Lock Cylinder Replacement - On Vehicle .

Is the repair complete?

--

System OK

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