Diagnosis And Testing - Lamps/Lighting - Exterior: Headlamps

WARNING: This page is about a different car, the 2011 RAM Pickup and 2011 RAM Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

As part of the exterior lighting fail-safe feature, upon ignition ON all exterior park lamps and the headlamp low beams will illuminate regardless of the headlamp switch position if the EMIC (CCN) cannot detect an input from the headlamp switch, or if there is a loss of data bus communication. Diagnose and repair those problems before attempting to repair the headlamp system. The TIPM will store a Diagnostic Trouble Code (DTC) for an open or shorted headlamp circuit. In addition, for automatic headlamps the air conditioning - heater control must be able to receive the hard wired input from the sun sensor on the top of the instrument panel and must be able to communicate with the TIPM over the CAN data bus. Refer to the appropriate diagnostic information.

CONDITION	POSSIBLE CAUSES	CORRECTION
HEADLAMP DOES NOT ILLUMINATE	1. Ineffective or missing bulb.	1. Test and replace headlamp bulb if required.
	2. Ineffective ground circuit.	2. Test and repair open headlamp ground circuit if required.
	3. Ineffective feed circuit.	3. Test and repair open headlamp low beam or high beam feed circuit if required.
	4. Ineffective switch.	4. Test and replace headlamp switch if required.
	5. Ineffective EMIC (CCN) inputs or outputs.	5. Use a diagnostic scan tool to test the EMIC (CCN) inputs and outputs. Refer to the appropriate diagnostic information.
	6. Ineffective TIPM inputs or outputs.	6. Use a diagnostic scan tool to test the TIPM inputs and outputs. Refer to the appropriate diagnostic information.
HEADLAMP DOES NOT EXTINGUISH	1. Ineffective feed circuit.	1. Test and repair shorted headlamp low beam or high beam feed circuit if required.
	2 Ineffective switch.	2. Test and replace headlamp switch if required.
	3. Ineffective EMIC (CCN) inputs or outputs.	3. Use a diagnostic scan tool to test the EMIC (CCN) inputs and outputs. Refer to the appropriate diagnostic information.
	4. Ineffective TIPM inputs or outputs.	4. Use a diagnostic scan tool to test the TIPM inputs and outputs. Refer to the appropriate diagnostic information.
HEADLAMPS ILLUMINATE WITH IGNITION ON AND HEADLAMP SWITCH OFF (FAIL-SAFE OPERATION)	1. Ineffective circuits between headlamp switch and EMIC (CCN).	1. Test and repair open headlamp switch mux and return circuits if required.
	2. Ineffective switch.	2. Test and replace headlamp switch if required.
	3. Loss of data bus communication.	3. Use a diagnostic scan tool to test the data bus. Refer to the appropriate diagnostic information.
	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.
HEADLAMPS WILL NOT SWITCH FROM HIGH TO LOW BEAMS, OR FROM LOW TO HIGH BEAMS	1. Ineffective LIN bus circuits between multi-function switch (SCM) and EMIC (CCN).	1. Test and repair open LIN bus circuits if required.
	2. Ineffective multi-function switch (SCM).	2. Use a diagnostic scan tool to test the EMIC (CCN) inputs and outputs. Refer to the appropriate diagnostic information.
AUTO HEADLAMPS INEFFECTIVE	1. Incorrect TIPM configuration.	1. Use a diagnostic scan tool to check and correct the TIPM configuration settings if required. Refer to the appropriate diagnostic information.
	2. Ineffective circuits between sun load sensor and air conditioner - heater control.	2. Test and repair sun sensor and sun sensor return circuits if required.
	3. Ineffective sun load sensor.	3. Test and replace sun load sensor if required.
	4. Ineffective TIPM inputs or outputs.	5. Use a diagnostic scan tool to test the TIPM inputs and outputs. Refer to the appropriate diagnostic information.