GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check for the Keyless Entry system?

--

Go to Step 2

Go to Diagnostic System Check - Remote Keyless Entry

2

Does the horn sound and both the headlamps and the backup lamps flash when the panic button on the keyless entry transmitter is pressed?

--

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

Do the horns sound or headlamps and backup lamps turn on and off when the panic button is pressed?

--

Go to Step 4

Go to Keyless Entry System Inoperative

4

Do the horns sound when the panic button is pressed?

--

Go to Diagnostic System Check - Lighting Systems in Lighting Systems

Go to Diagnostic System Check - Horns in Horns