1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle

1. Install a scan tool.
2. Turn ON the ignition with the engine OFF.
3. With the scan tool, command the horn relay ON.

Does the horn sound?

--

Go to Testing for Intermittent Conditions and Poor Connections

Go to Step 3

Press the horn switch on the steering wheel.

Does the horn sound?

--

Go to Step 4

Go to Horns Inoperative

1. Disconnect the body control module (BCM) connector containing the horn relay control circuit.
2. With a fused jumper wire and appropriate terminal adapter, ground the horn relay control circuit.

Does the horn sound?

--

Go to Step 6

Go to Step 5

Test the horn relay control circuit for an open or short to battery.

Did you find and correct the condition?

--

Go to Step 8

Go to Testing for Intermittent Conditions and Poor Connections

Inspect for poor connections at the harness connector of the BCM.

Did you find and correct the condition?

--

Go to Step 8

Go to Step 7

Replace the BCM. Refer to Body Control Module Replacement for replacement, setup, and programming.

Did you complete the replacement?

--

Go to Step 8

--

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3