Automatic Headlamps

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Be certain that the headlamps can be turned ON and OFF manually before attempting to diagnose and repair the Automatic Headlamps. If not, diagnose and repair those problems before attempting to repair the Automatic Headlamps.

NOTE:

The Automatic Headlamp switch is integral to the headlamp switch itself, which communicates with the Body Control Module (BCM) over via data bus. Before performing any of the following tests, determine whether the other functions of the headlamp are operational. If the other functions are ineffective, diagnose and repair that problem before attempting to repair the Automatic Headlamps.

CONDITION	POSSIBLE CAUSES	CORRECTION
AUTO HEADLAMPS INEFFECTIVE	1. Feature not enabled.	1. Enable Auto Low or Auto Low/High using the customer programmable features function of the Electronic Vehicle Information Center (EVIC).
	2. Ineffective headlamp switch.	2. Test and replace switch if required.
	3. Ineffective circuits between sun load sensor and air conditioner - heater control.	3. Test and repair sun sensor and sun sensor return circuits if required.
	4. Ineffective sun load sensor (except with automatic wipers). If vehicle is export, then the Light Rain Sensor Module (LRSM) is 100% in control of light identification and not the Sun Sensor.	4. Test and replace sun load sensor if required. Connect the scan tool and monitor the sensor voltage while covering and uncovering the sensor. A covered sensor voltage should read approximately 4.6V and an uncovered sensor should read approximately 2.3V.
	5. Ineffective LRSM (with automatic wipers).	5. Use a diagnostic scan tool to test and replace the LRSM if required. Refer to the appropriate diagnostic information.
	6. Ineffective Body Control Module (BCM) inputs or outputs.	6. Use a diagnostic scan tool to check and configure BCM if required.