Diagnosis And Testing - Horn System

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

Disable the airbag system before attempting any steering wheel, steering column, seat belt tensioner, side airbag or instrument panel component diagnosis or service. Disconnect and isolate the negative battery (ground) cable. Wait two minutes for the airbag system capacitor to discharge before performing further diagnosis or service. This is the only sure way to disable the airbag system. Failure to follow these instructions may result in accidental airbag deployment and possible serious or fatal injury.

NOTE:

In most cases, any problem involving continually sounding horns can be quickly alleviated by removing the horn fuse from the Totally Integrated Power Module (TIPM).

HORN SYSTEM DIAGNOSIS
CONDITION	POSSIBLE CAUSES	CORRECTION
BOTH HORNS INOPERATIVE	1. Ineffective fuse.	1. Check the fuses in the Totally Integrated Power Module (TIPM). Replace the fuse and repair the shorted circuit or component, if required.
	2. Ineffective horn switch.	2. Test the horn switch and switch circuits for proper operation. Replace the horn switch or repair the horn switch wiring, if required.
	3. Ineffective horns.	3. Test the horn and horn circuits for proper operation. Replace the horns or repair the horn wiring, if required.
	4. Ineffective EMIC (CCN) inputs or outputs.	4. Use a diagnostic scan tool to test the EMIC (CCN) inputs and outputs. Refer to the appropriate diagnostic information.
	5. Ineffective TIPM inputs or outputs.	5. Use a diagnostic scan tool to test the TIPM inputs and outputs. Refer to the appropriate diagnostic information.
ONE HORN INOPERATIVE	1. Ineffective horn.	1. Test the horn and horn circuits for proper operation. Replace the horns or repair the horn wiring, if required.
HORN SOUNDS CONTINUOUSLY	1. Ineffective horn switch.	1. Test the horn switch and switch circuits for proper operation. Replace the horn switch or repair the horn switch wiring, if required.