Land Rover Discovery: Headlamp Leveling

PRINCIPLES OF OPERATION

For a detailed description of the Headlamp Leveling system, refer to the relevant Description and Operation section in the workshop manual. REFER to: Exterior Lighting (417-01 Exterior Lighting, Description and Operation).

INSPECTION AND VERIFICATION

CAUTION:

Diagnosis by substitution from a donor vehicle is NOT acceptable.

Substitution of control modules does not guarantee confirmation of a fault, and may also cause additional faults in the vehicle being tested and/or the donor vehicle.

NOTES:

• If a control module or a component is suspect and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual, or determine if any prior approval programme is in operation, prior to the installation of a new module/component.
• When performing voltage or resistance tests, always use a digital multimeter that has the resolution ability to view 3 decimal places.

  For example, on the 2 volts range can measure 1mV or 2 K Ohm range can measure 1 Ohm. When testing resistance always take the resistance of the digital multimeter leads into account.

• Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

1. Verify the customer concern
2. Visually inspect for obvious signs of damage and system integrity

Visual Inspection

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step
4. If the cause is not visually evident, verify the symptom and refer to the Symptom Chart, alternatively check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index
5. Check DDW for open campaigns. Refer to the corresponding bulletins and SSMs which may be valid for the specific customer complaint and carry out the recommendations as required

SYMPTOM CHART

SYMPTOM:

Headlamp leveling system inoperative

POSSIBLE CAUSE:

• Adaptive front lighting system fault
• Body system fault
• Adaptive damping system fault
• Headlamp internal failure - Leveling motor/linkage

ACTION:

• Using the Jaguar Land Rover approved diagnostic equipment, check the headlamp leveling control module for related DTCs and refer to the relevant DTC index
• Using the Jaguar Land Rover approved diagnostic equipment, check the central junction box for related DTCs and refer to the relevant DTC index
• Using the Jaguar Land Rover approved diagnostic equipment, check the suspension control module for related DTCs and refer to the relevant DTC index
• Install a new headlamp

SYMPTOM:

Headlamp alignment incorrect

POSSIBLE CAUSE:

• Adaptive front lighting system fault
• Body system fault
• Adaptive damping system fault
• Headlamp internal failure - Leveling motor/linkage

ACTION:

• Using the Jaguar Land Rover approved diagnostic equipment, check the headlamp leveling control module for related DTCs and refer to the relevant DTC index
• Using the Jaguar Land Rover approved diagnostic equipment, check the central junction box for related DTCs and refer to the relevant DTC index
• Using the Jaguar Land Rover approved diagnostic equipment, check the suspension control module for related DTCs and refer to the relevant DTC index
• Install a new headlamp

DTC INDEX

For a list of Diagnostic Trouble Codes (DTCs) that could be logged on this vehicle, please refer to Section 100-00. REFER to: (100-00 General Information) Diagnostic Trouble Code Index - DTC: Central Junction Box (CJB) (Description and Operation), Diagnostic Trouble Code Index - DTC: Headlamp Leveling Control Module (HLCM) (Description and Operation).

Headlamp Levelling Control Module (G1785272) Removal and Installation

REMOVAL

CAUTION:

Protect the surrounding components.

NOTES:

• Removal steps in this procedure may contain installation details.
• Some variation in the illustrations may occur, but the essential information is always correct.

Disconnect the battery ground cable.

Refer to: Specifications (414-01 Battery, Mounting and Cables, Specifications).

Refer to: Rear Spoiler (501-08 Exterior Trim and Ornamentation, Removal and Installation).

Torque: 2 Nm

INSTALLATION

1. To install reverse the removal procedure.

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