Land Rover Discovery: Glass, Frames and Mechanisms / Diagnosis and Testing - Inspection and Verification

PRINCIPLES OF OPERATION

For a detailed description of the Glass, Frames and Mechanisms, refer to the relevant Description and Operation section in the workshop manual.

REFER to: Glass, Frames and Mechanisms (501-11 Glass, Frames and Mechanisms, 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.
• The door window regulator motor can be removed from the regulator. Issues with the door window regulator motor may require the installation of a new door window regulator motor only and not the replacement of the complete regulator assembly.
• 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

FURTHER DIAGNOSTICS FOR ROOF OPENING PANEL BLIND ISSUES

The following diagnostic tests should be used if the customer reports that the roof opening panel blind is not functioning as expected.

NOTE:

These diagnostic procedures allow the technician to accurately identify the precise nature of the roof opening panel blind fault. To assist the supplier in understanding the concerns (so that the quality of the parts can be improved) please use the diagnostics aid below to correctly identify and report the specific concern description via the dealer warranty system

ROOF OPENING PANEL BLIND FAULTS - REMEDIAL ACTIONS

NOTE:

If the roof opening panel blind is de-normalised the roof glass cannot open (roof opening panel blind position is not known). If the roof glass is de-normalised the roof opening panel blind cannot close (roof glass position is not known)

Roof opening panel blind initialization

NOTE:

Roof opening panel blind initialization will be lost if the battery is disconnected, or if the roof opening panel blind motor power supply is interrupted whilst the roof opening panel blind is in motion.

Initialize the roof opening panel blind as follows:

1. Start the engine and leave running during the initialization process
2. Ensure that the roof opening panel blind is in the fully closed position - press the close switch to achieve this
3. Press and hold the close switch again and wait for the cables to double click (it should take approximately 30 seconds), and release the switch
4. Within 3 seconds, press and hold the close switch. The roof opening panel blind will automatically travel toward the open position and then to the fully closed position. Release the switch when movement is complete

Glass, Frames and Mechanisms / Diagnosis and TestingWindow Diagnostics - Pinpoint Tests

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