Land Rover Discovery: Reversing Lamps

PRINCIPLES OF OPERATION

For a detailed description of the Reverse Lamps, 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:

Reverse lamps(s) inoperative

POSSIBLE CAUSE:

• Body system fault
• Reverse gear switch signal circuit short circuit to power, open circuit, high resistance (manual transmission)
• Transmission system fault (automatic transmission)
• Reverse lamp circuit short circuit to ground, short circuit to power, open circuit, high resistance

ACTION:

• Using the Jaguar Land Rover approved diagnostic equipment, check the central junction box for related DTCs and refer to the relevant DTC index
• Manual transmission: Using the Jaguar Land Rover approved diagnostic equipment, check the central junction box for related DTCs and refer to the relevant DTC index. Refer to the electrical circuit diagrams and check the reverse gear switch signal circuit for short circuit to power, open circuit, high resistance. Repair the wiring harness or install a new reverse gear switch as necessary
• Automatic transmission: Using the Jaguar Land Rover approved diagnostic equipment, check the transmission control module for related DTCs and refer to the relevant DTC index
• Refer to the electrical circuit diagrams and check the rear fog lamp circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair the wiring harness or install a new reverse lamp bulb as necessary

SYMPTOM:

Reverse lamps(s) dim

POSSIBLE CAUSE:

• Body system fault
• Reverse lamp bulb incorrect specification
• Reverse lamp circuit high resistance

ACTION:

• Using the Jaguar Land Rover approved diagnostic equipment, check the central junction box for related DTCs and refer to the relevant DTC index
• Install a new reverse lamp bulb
• Refer to the electrical circuit diagrams and check the reverse lamp circuit for high resistance. Repair the wiring harness or install a new reverse lamp bulb as necessary

SYMPTOM:

Reverse lamps(s) stuck on

POSSIBLE CAUSE:

• Body system fault
• Reverse gear switch signal circuit short circuit to ground (manual transmission)
• Transmission system fault (automatic transmission)
• Reverse lamp circuit short circuit to power

ACTION:

• Using the Jaguar Land Rover approved diagnostic equipment, check the central junction box for related DTCs and refer to the relevant DTC index
• Manual transmission: Using the Jaguar Land Rover approved diagnostic equipment, check the central junction box for related DTCs and refer to the relevant DTC index. Refer to the electrical circuit diagrams and check the reverse gear switch signal circuit for short circuit to ground. Repair the wiring harness or install a new reverse gear switch as necessary
• Automatic transmission: Using the Jaguar Land Rover approved diagnostic equipment, check the transmission control module for related DTCs and refer to the relevant DTC index
• Refer to the electrical circuit diagrams and check the reverse lamp circuit for short circuit to power. Repair the wiring harness as necessary

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).

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