The Horn Does Not Sound and/or The Headlights Do Not Flash When The Panic Button On The Transmitter Is Pressed

Keyless/Power Door Locks/Security System 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, refer to the B-CAN System Diagnosis Test Mode A Troubleshooting - B-CAN System Diagnosis Test Mode A, and troubleshoot the indicated DTCs 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 -

Check the horn relay circuit .

3. Turn the headlight switch ON.

Do the headlights come on?

YES -

Go to step 4.

NO -

Check the lighting circuit. Do the MICU input test Exterior Lights (Drivers and Passengers MICU) Input Test.

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 under-dash fuse/relay box, and recheck. If the problem goes away, replace the original immobilizer-keyless control unit Service and Repair or the driver's under-dash fuse/relay box Drivers Under-Dash Fuse/Relay Box (Drivers MICU) Removal and Installation.

NO -

Replace the transmitter.