GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Turn the ignition switch to the LOCK position.
  2. Disconnect the seat belt/ ignition key/ lamps alarm.
  3. Ensure the key is in the ignition switch.
  4. Open the driver's door.
  5. Probe between B+ and seat belt/ ignition key/ lamps alarm connector terminal C1.

Is the test light on?

--

Go to Step 6

Go to Step 2

2

Using a test lamp, backprobe between B+ and C201 terminal A9.

Is the test light on?

--

Go to Step 3

Go to Step 4

3

Using a DMM, measure the resistance between the seat belt/ ignition key/ lamps alarm harness connector terminal C1 and C201 terminal A8.

Is the resistance less than the specified value?

2 ohms

Go to Step 7

Go to Step 8

4

Using a DMM, measure the resistance between the following components:

    • The ignition key warning switch harness connector terminal A9
    • The left front doorlock harness connector terminal C

Is the resistance less than the specified value?

2 ohms

Go to Step 5

Go to Step 9

5

Using a DMM, measure the resistance between the following components:

    • The left front doorlock harness connector terminal D
    • Ground

Is the resistance less than the specified value?

2 ohms

Go to Step 10

Go to Step 11

6

  1. Inspect the seat belt/ ignition key/ lamps alarm connector terminal C1 for a poor connection.
  2. Replace the seat belt/ ignition key/ lamps alarm connectors as needed. Refer to Multifunction Alarm Module Replacement .

Is the repair complete?

--

Go to Step 12

--

7

  1. Inspect the following connectors for a poor connection:
  2. • The C201 terminal A8
    • The C201 terminal A9
  3. If the connections are OK, replace the ignition key warning switch.

Is the repair complete?

--

Go to Step 12

--

8

Repair a poor connection or an open in CKT 80.

Is the repair complete?

--

Go to Step 12

--

9

Repair a poor connection or an open in CKT 159.

Is the repair complete?

--

Go to Step 12

--

10

  1. Inspect the left front doorlock switch electrical connector for poor terminal contact.
  2. If the connector is OK, replace the left front doorlock switch. Refer to Front Door Switch Replacement in Doors.

Is the repair complete?

--

Go to Step 12

--

11

Repair a poor connection or an open in CKT 750.

Is the repair complete?

Go to Step 12

--

12

  1. Ensure that the ignition switch is in the LOCK position.
  2. Reconnect the connectors and reinstall the components that were removed.

Is the repair complete?

--

Go to Audible Warnings System Check

--