1. Turn the headlamp switch to the HEAD position.
2. Observe the headlamps.

Are the headlamps ON?

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Go to Step 2

Go to Exterior Lights System Check

1. Turn the headlamps to the OFF position.
2. Momentarily press the horn switch.

Does the horn sound?

--

Go to Step 3

Go to Horns System Check

Has a BCM diagnostic system check been performed?

--

Go to Step 4

Go to Diagnostic System Check - Body Control System

1. Remove the key from the ignition key lock cylinder.
2. Close all of the vehicle doors.
3. Press the LOCK button on the keyless entry transmitter 1 time, while observing the door locks.
4. Press the UNLOCK button on the keyless entry transmitter 2 times, while observing the door locks.

Does the keyless entry system operate the door locks?

--

Go to Step 5

Go to Remote Keyless Entry System Check

1. Set the remote unlock verification to mode 4. Refer to Remote Unlock Control Customization
2. Set the remote lock verification to mode 4. Refer to Locking Control Customization
3. Press the LOCK button on the keyless entry transmitter, while observing the headlamps and listening to the horn.
4. Press the UNLOCK button on the keyless entry transmitter, while observing the headlamps and listening to the horn.

Does the horn sound and the headlamps flash upon pressing the LOCK button and the UNLOCK button on the keyless entry transmitter?

--

System OK

Go to Step 6

1. Replace the BCM. Refer to Body Control Module Replacement in Body Control System.
2. Perform the Setup New BCM procedure. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Is the repair complete?

--

Go to Step 7

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1. Turn the ignition switch to the LOCK position.
2. Reconnect all connectors/components that have been disconnected.

Have all the repairs been made?

--

Go to Remote Keyless Entry System Check

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