GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

Press the horn switch.

All of the horns function.

Horns Inoperative

Horns Always On

2

Listen to the horns.

The horn tone is good.

Horns - Poor Tone

3

  1. Press the key fob lock/unlock
  2. Press the horn switch.

The horns pulse for each button.

Refer to Remote Keyless Entry System Check

4

Without pressing the horn switch

The horns are off.

Horns Always On

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.