Land Rover Defender: Interior Lighting - Diagnosis and Testing

DIAGNOSIS AND TESTING

PRINCIPLE OF OPERATION

For a detailed description of the interior lighting system and operation, refer to the relevant description and operation section of the workshop manual. REFER to: Interior Lighting (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 the control module or a component may be at fault and the vehicle remains under manufacturer warranty, refer to the Warranty Policy and Procedures manual (section B1.2), or determine if any prior approval program 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-to-date calibration certificate. When testing resistance, always take the resistance of the digital multimeter leads into account.

1. Verify the customer concern
2. Visually inspect for obvious signs of mechanical or electrical damage

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 relevant DTC index
5. Check JLR claims submission system for open campaigns. Refer to the corresponding bulletins and SSMs which may be valid for the specific customer complaint and complete the recommendations as required

SYMPTOM CHART

PINPOINT TESTS

PINPOINT TEST A : INTERIOR LAMP FUNCTION TESTS

PINPOINT TEST B : AUTO MODE FUNCTION TESTS

PINPOINT TEST C : BATTERY AND CHARGING SYSTEM TESTS

PINPOINT TEST D : INTERIOR LAMP SIGNAL TESTS

PINPOINT TEST E : FRONT INTERIOR LAMP TESTS

PINPOINT TEST F : REAR LEFT INTERIOR LAMP TESTS

PINPOINT TEST G : REAR RIGHT INTERIOR LAMP TESTS

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