Automatic High Beam Control

NOTE:

For Automatic High Beam Control (AHBC) to operate, the Auto High Beam option must be enabled using the customer programmable features function of the Electronic Vehicle Information Center (EVIC). Also, the Body Control Module (BCM) must be properly configured for the automatic headlights option using a diagnostic scan tool. Refer to the appropriate diagnostic information.

CONDITION	POSSIBLE CAUSES	CORRECTION
FORWARD FACING CAMERA MODULE (FFCM) INEFFECTIVE AND RED LED ON INSIDE REAR VIEW MIRROR NOT ON	1. Feature not enabled.	1. Enable Auto Dim High Beams using the customer programmable features function of the Electronic Vehicle Information Center (EVIC).
	2. Automatic headlights are not turned ON.	2. Turn automatic headlights ON using the control knob of the headlight switch.
	3. Headlight high beams are not selected.	3. Turn high beam headlights ON using the beam selector function of the multifunction switch control stalk.
	4. Vehicle speed is below 34 km/h (18 mph).	4. Increase vehicle speed. FFCM is not designed to operate at speeds below 34 km/h (18 mph).
	5. Ineffective ElectroChromic (EC) mirror inputs or outputs.	5. Use a diagnostic scan tool and the appropriate diagnostic information for additional EC mirror diagnosis.
	6. Incorrect BCM configuration.	6. Use a diagnostic scan tool to check and correct the BCM configuration settings if required. Refer to the appropriate diagnostic information.
	7. FFCM imager lens dirty or obstructed.	7. Clean imager lens and windshield or remove obstructions from the windshield glass if required.
	8. Ineffective ground circuit.	8. Test and repair open ground circuit to inside rear view mirror as required.
	9. Ineffective feed circuit.	9. Test and repair open fused run relay output circuit to inside rear view mirror if required.
	10. Loss of Controller Area Network (CAN) data bus or Local Interface Network (LIN) data bus communication.	10. Use a diagnostic scan tool and the appropriate diagnostic information for additional CAN data bus or LIN data bus diagnosis.
	11. Internal faults in imager camera or EC mirror circuitry.	11. Use a diagnostic scan tool and the appropriate diagnostic information for additional imager camera and EC mirror (AHBM) diagnosis.
FFCM INEFFECTIVE AND RED LED ON INSIDE REAR VIEW MIRROR FLASHING CONTINUALLY	1. FFCM calibration required (slow flash - once-per-second).	1. Perform the FFCM Calibration procedure. Refer to the appropriate service information RECALIBRATION OF SENSORS AND MODULES
FFCM INEFFECTIVE AND RED LED ON INSIDE REAR VIEW MIRROR ON CONTINUOUSLY	1. FFCM failed calibration procedure due to improper set up.	1. Perform the FFCM Calibration procedure properly.Refer to the appropriate service information RECALIBRATION OF SENSORS AND MODULES
	2. FFCM failed calibration procedure due to a mechanical misalignment.	2. Use a diagnostic scan tool to retrieve the Diagnostic Trouble Code (DTC). Refer to the appropriate diagnostic information.