GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the entire exterior lights system check performed?

--

Go to Step 2

Go to Exterior Lights System Check

2

Do the hazard lamps operate properly?

--

Go to Step 3

Go to Hazard Lamps Inoperative

3

Using a test light, backprobe between the stop lamp switch harness connector C1 between terminal A and ground.

Does the test light illuminate?

--

Go to Step 4

Go to Step 5

4

  1. Using a test light, backprobe the stop lamp switch harness connector C1 terminal B and ground.
  2. Depress and hold the brake pedal.

Does the test light illuminate?

--

Go to Step 6

Go to Step 7

5

Repair a poor connection or and open in circuit 140.

Is the repair complete?

--

Go to Step 8

--

6

Repair a poor connection or an open in circuit 20.

Is the repair complete?

--

Go to Step 8

--

7

Adjust/Replace the stop lamp switch. Refer to Stop Lamp Switch Adjustment Stop Lamp Switch Replacement

Is the repair complete?

--

Go to Step 8

--

8

  1. Turn the ignition switch to the OFF position.
  2. Reconnect all connectors/components removed.

Have all repairs been made?

--

Go to Exterior Lights System Check

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