Diagnostics and testing of headlights (Discovery 3)

Review

There are three headlight options: halogen, bi-xenon or adaptive front-lighting system (AFS).

For a detailed description of the system construction and operation, refer to Section 417-00, Exterior Lighting, in the Service Station Manual.

Because there is a risk of injury, be sure to follow the following safety precautions.

Safety information

CAUTION: The voltage in xenon headlight systems can reach 28,000 V. Always turn off the headlights before working on them. Failure to follow this instruction may result in injury.

When working with a xenon headlight system, the following precautions must be observed:

1. It is PROHIBITED to carry out any work on the xenon headlight system with the lighting devices on.

2. Work with xenon lamps is only allowed with the use of personal protective equipment, such as gloves and glasses. Do not touch the glass bulb of the lamp.

3. Disposal of xenon lamps must be carried out in accordance with the rules for disposal of hazardous waste.

4. The lamp can only be turned on when it is in the installed position, in the reflector.

Complete instructions for the prescribed repair procedures for the xenon headlamp system are provided in Section 100-00, General Information, Standard Operating Procedures, of the workshop manual.

Inspection and verification

1. Ensure that the customer's complaint is justified.

Please note that intermittent fault messages may be caused by the cycling nature of the field effect transistors (FETs).



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2. Visually inspect for obvious mechanical and electrical problems.

Mechanical factors

Electrical factors

Condition and installation of headlights(s) Lamp(s) and installation Lamp holder(s) and installation Light switch and its installation Condition and installation of the left multifunction switch on the steering column

Fuses Battery electrical junction box (BJB) - fuse 11E BJB - fuse 15E BJB - fuse 16E BJB - fuse 25E Central electrical junction box (CJB) - fuse 61P CJB - fuse 56P CJB - fuse 27P CJB - fuse 62P CJB - fuse 18P CJB - fuse 2P CJB - fuse 4P CJB - fuse 67P Automatic headlight relay Parking light relay Wiring harness Loosening or corrosion of connector(s) Battery Junction Box (BJB) Central Junction Box (CJB) Adaptive Front-lighting System (AFS) module Headlight Electric Drive Modules Instrument cluster (IPC) Steering Angle Sensor Module (SASM) Transmission Control Module (TCM) Engine Control Module (ECM) Anti-lock Brake System (ABS) Control Module Air suspension control module LIN electrical circuits (Local interconnect network) CAN electrical circuits (Control Area Network)

3. If an obvious cause for the problem you identified or the customer described is found, resolve it before moving on to further action. (if possible).

4. Use the approved diagnostic system or scan tool to retrieve all diagnostic trouble codes (DTCs) before referring to the symptom chart or DTC index.

Since DTCs are stored in more than one module, a full vehicle data read is recommended.



Clear all DTCs after troubleshooting.

Table of signs of malfunction

Sign of malfunction	Possible reasons	Action
Low beam headlight(s) not working / High beam headlight(s) not working	Lamp failure The fuse(s) have blown Electrical circuit failure The light switch is faulty Left multifunction switch on steering column faulty	Check the condition of the lamp and fuse (see visual inspection table). Check the headlamp circuits. Check the operation of the light switch. Check the operation of the left multifunction switch on the steering column. Refer to the electrical manual. Check for DTCs indicating a malfunction of the headlamp or related electrical circuit.
Low beam headlight(s) dim / High beam headlight(s) not working	Incorrect lamp power The lever for selecting the left-hand or right-hand traffic system is set to the wrong position. Electrical circuit failure The light switch is faulty Left multifunction switch on steering column faulty	Check the condition and power of the lamp. Check the correct installation of the left-hand or right-hand drive selector lever. Check the electrical circuits of the headlights. Check the operation of the light switch. Check the operation of the left multifunction switch on the steering column. Refer to the electrical equipment manual.
Low beam headlight(s) constantly on / High beam headlight(s) constantly on	Electrical circuit failure The light switch is faulty Left multifunction switch on steering column faulty The headlight timer function is faulty	Check the headlamp circuits. Check the operation of the light switch. Check the operation of the left multifunction switch on the steering column. Check the operation of the headlamp timer function. Refer to the electrical manual. Check for DTCs indicating a malfunction in the headlamp circuit.
The high/low beam switching function does not work	Electrical circuit failure Left multifunction switch on steering column faulty Xenon headlight interrupter mechanism malfunction	Check the headlamp circuits. Check the operation of the left multifunction switch on the steering column. Check the operation of the xenon headlamp flasher mechanism. Refer to the electrical manual. Check for DTCs indicating a malfunction in the headlamp circuit.
The indicator lamp(s) does not work	The fuse(s) have blown The light switch is faulty Left multifunction switch on steering column faulty Electrical circuit failure Instrument cluster malfunction	Check the fuse(s) (see visual inspection). Check the operation of the light switch. Check the operation of the left multifunction switch on the steering column. Check the electrical circuits of the indicator lamp. Refer to the electrical equipment manual. Check for DTCs indicating a malfunction of the instrument cluster or CAN system.

DTC Index

NOTE: Generic scan tools cannot read the codes listed or can only read 5-digit codes. Match the 5 digits from the scan tool with the first 5 digits of the listed 7-digit code to identify the fault. (the last 2 digits provide additional information readable by a manufacturer approved diagnostic system).

DTC	Description	Possible reasons	Action
B1D0011	Left low beam lamp	Left Low Beam Headlamp Circuit Short to Ground	Refer to the guided diagnostic routine for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1D0015	Left low beam lamp	Left low beam headlight circuit: short circuit to battery + Left Low Beam Headlamp Circuit High Resistance	Refer to the guided diagnostic routine for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1D0111	Right low beam lamp	Right Low Beam Headlamp Circuit Short to Ground	Refer to the guided diagnostic routine for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1D0115	Right low beam lamp	Right low beam headlight circuit: short circuit to battery + Right Low Beam Headlamp Circuit High Resistance	Refer to the guided diagnostic routine for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1D0211	Left high beam lamp electrical circuit	Left High Beam Headlamp Circuit Short to Ground	Refer to the guided diagnostic routine for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1D0215	Left high beam lamp electrical circuit	Left high beam headlight circuit: short circuit to battery + Left High Beam Headlamp Circuit High Resistance	Refer to the guided diagnostic program for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1D0311	Right high beam lamp electrical circuit	Right High Beam Headlamp Circuit Short to Ground	Refer to the guided diagnostic routine for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1D0315	Right high beam lamp electrical circuit	Right high beam headlight circuit: short circuit to battery + Right High Beam Headlamp Circuit High Resistance	Refer to the guided diagnostic routine for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1D3613	Turn signal switch	Left multifunction switch on steering column: high resistance	Refer to the guided diagnostic routine for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
B1D4013	Electrical circuit for connecting the light switch	Light Switch Circuit: High Resistance	Refer to the guided diagnostic routine for this code on the approved diagnostic system. Refer to the electrical guides and check the circuit. Replace/repair as necessary.
U018287	Lost Communication with Lighting Control Module - Front	CAN bus failure AFS module is disconnected AFS module not configured/calibrated AFS module failure	Refer to the "Network Communication" section in the service station manual.
U300016	Control module	The voltage in the electrical circuit is below the threshold value	Check the status and charging of the battery. See section 414-00 "Charging system" in the Service Station manual. Check the electrical circuits of the control module. Refer to the electrical equipment manual.
U300017	Control module	The voltage in the electrical circuit is above the threshold value	Check the status and charging of the battery. See section 414-00 "Charging system" in the Service Station manual. Check the electrical circuits of the control module. Refer to the electrical equipment manual.
U300042	Control module	General memory failure	If a module is suspected, refer to the Warranty Policy and Procedures Guide.
U300055	Control module	Incorrect software loaded CAN Wiring to AFS Module: High Resistance Incorrect CAN configuration for AFS module	Configure the modules using an approved diagnostic system. Check for CAN-related DTCs.
U1A1449	CAN initialization failure	Internal electronic malfunction	Check the electrical power and ground circuits of the unit. Refer to the electrical manual. Configure the module(s) using the approved diagnostic system. If a module is suspect, refer to the warranty policy and procedures manual.