Horn Doesn't Sound/Headlights Do Not Flash When PANIC Button On Transmitter Is Pressed

Symptom Troubleshooting: The horn does not sound and/or the headlights do not flash when the PANIC button on the transmitter is pressed

The horn does not sound and/or the headlights do not flash when the PANIC button on the transmitter is pressed

NOTE: Before troubleshooting, check the B-CAN DTCs. If any DTC is indicated, troubleshoot the indicated DTC first.

1. Press the PANIC button.

Do the horns sound?
YES - Go to step 3.

NO - Go to step 2.


2. Press the horn button.

Do the horns sound?
YES - Go to step 3.

NO - Do the horn switch test. Testing and Inspection


3. Turn the headlight switch to ON (II).

Do the headlights come on?
YES - Go to step 4.

NO - Check the lighting circuit.


4. Do the transmitter test. Keyless Entry Transmitter Test

Is the transmitter OK?
YES - Substitute a known-good immobilizer-keyless control unit and recheck. If there is still a problem, substitute a known-good driver's MICU and recheck. If the problem goes away, replace the original immobilizer-keyless control unit or MICU.

NO - Replace the transmitter.