Land Rover Discovery: Interior Lighting / Diagnosis and Testing

PRINCIPLES OF OPERATION

For a detailed description of the Interior Lighting, refer to the relevant Description and Operation section in the workshop manual. REFER to: Interior Lighting (417-02 Interior 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 accurate to three decimal places, and with an up-todate calibration certificate. 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:

Front/rear interior lamp inoperative

POSSIBLE CAUSE:

• Automatic mode switched off
• Front/rear interior lamp circuit short circuit to ground, short circuit to power, open circuit, high resistance

ACTION:

GO to Pinpoint Test A.

SYMPTOM:

Ambience lighting inoperative

POSSIBLE CAUSE:

• Ambience lighting circuit short circuit to ground, short circuit to power, open circuit, high resistance

ACTION:

• Refer to the electrical circuit diagrams and check the ambience lighting circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness or install a new ambience lighting LED as necessary

SYMPTOM:

Map reading lamp(s) inoperative

POSSIBLE CAUSE:

• Map reading lamps circuit short circuit to ground, short circuit to power, open circuit, high resistance

ACTION:

• Refer to the electrical circuit diagrams and check the map reading lamps circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness or install a new map reading lamp bulb as necessary

SYMPTOM:

Vanity mirror lamp(s) inoperative

POSSIBLE CAUSE:

• Vanity mirror lamps circuit short circuit to ground, short circuit to power, open circuit, high resistance

ACTION:

• Refer to the electrical circuit diagrams and check the vanity mirror lamps circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness or install a new vanity mirror lamp bulb as necessary

SYMPTOM:

Glovebox lamp inoperative

POSSIBLE CAUSE:

• Glovebox lamp circuit short circuit to ground, short circuit to power, open circuit, high resistance

ACTION:

• Refer to the electrical circuit diagrams and check the glovebox lamp circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness or install a new glovebox lamp as necessary

SYMPTOM:

Footwell lamp(s) inoperative

POSSIBLE CAUSE:

• Footwell lamps circuit short circuit to ground, short circuit to power, open circuit, high resistance

ACTION:

• Refer to the electrical circuit diagrams and check the footwell lamps circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness or install a new footwell lamp bulb as necessary

SYMPTOM:

Approach lamp(s) inoperative

POSSIBLE CAUSE:

• Approach lamps circuit short circuit to ground, short circuit to power, open circuit, high resistance

ACTION:

• Refer to the electrical circuit diagrams and check the approach lamps circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness or install a new approach lamp as necessary

SYMPTOM:

Puddle lamp(s) inoperative

POSSIBLE CAUSE:

• Puddle lamps circuit short circuit to ground, short circuit to power, open circuit, high resistance

ACTION:

• Refer to the electrical circuit diagrams and check the puddle lamps circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness or install a new puddle lamp bulb as necessary

SYMPTOM:

Luggage compartment lamp inoperative

POSSIBLE CAUSE:

• Luggage compartment lamp circuit short circuit to ground, short circuit to power, open circuit, high resistance

ACTION:

• Refer to the electrical circuit diagrams and check the luggage compartment lamp circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness or install a new luggage compartment lamp bulb as necessary

PINPOINT TESTS

NOTE:

The interior lamps should extinguish 20 seconds after the vehicle was unlocked if a door was not opened.

NOTE:

The vehicle will lock 30 seconds after it was unlocked if a door was not opened. If this has occurred, unlock the vehicle using the smart key unlock switch and wait until the interior lamps extinguish before continuing.

NOTE:

Steps 2 to 4 should be completed within 20 seconds.

NOTE:

Interior lamps auto mode off is also known as Hunting mode.

NOTE:

Interior lamp operation is inhibited if the battery state of charge is below threshold

NOTE:

In step 1, do not disconnect the electrical connector(s). The lamp is removed for access only.

NOTE:

In step 1, do not disconnect the electrical connector(s). The lamp is removed for access only.

NOTE:

In step 1, do not disconnect the electrical connector(s). The lamp is removed for access only.

NOTE:

In step 1, do not disconnect the electrical connector(s). The lamp is removed for access only.

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: Diagnostic Trouble Code Index - DTC: Central Junction Box (CJB) (100-00 General Information, Description and Operation).

Interior LightingFog Lamps

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