GM Service Manual Online
For 1990-2009 cars only

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Remote Keyless Entry

2

With the keyless entry transmitter, attempt to operate the panic function.

Do the horns pulse and the daytime running lamps flash on and off?

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

Go to Step 3

3

Do any of the panic functions operate?

Go to Step 4

Go to Keyless Entry System Inoperative

4

Do the horns pulse on and off?

Go to Headlights/Daytime Running Lights (DRL) Schematics in Lighting Systems

Go to Diagnostic System Check - Horns in Horns