Land Rover Defender: Glass, Frames and Mechanisms - Diagnosis and Testing

DIAGNOSIS AND TESTING

PRINCIPLE OF OPERATION

For a detailed description of the glass, frames and mechanisms and operation, refer to the relevant Description and Operation section of the workshop manual. REFER to: Glass, Frames and Mechanisms (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 checked and/or the donor vehicle.

NOTES:

• If the control module or a component is at fault and the vehicle remains under manufacturer warranty, refer to the warranty policy and procedures manual, 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 that has the resolution ability to view 3 decimal places. For example, on the 2 volts range can measure 1 mV or 2 kΩ range can measure 1 Ω. 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.
• The window lift mechanism motor cannot be removed from the window lift mechanism assembly, if an issue with the window lift mechanism motor is diagnosed, replacement of the complete window lift mechanism assembly including motor will be required.

1. Verify the customer concern
2. Check the 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 required.
3. Visually inspect the moving glass system components for obvious signs of mechanical/electrical damage and system integrity.

Visual Inspection - Principal Moving Glass System Components

4. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
5. If the cause is not visually evident, verify the symptom and refer to the symptom chart, alternatively check for diagnostic trouble codes ( Diagnostic Trouble Code(s) (DTC)s) and refer to the DTC Index.

POST REPAIR ACTIVITY

Door Window Motor Initialisation Procedure

It is critical that the Door Window Motor Initialisation Procedure REFER to: Door Window Motor Initialization (501-11 Glass, Frames and Mechanisms, General Procedures). is completed to calibrate and activate the one-touch and antitrap functions correctly if, as part of the inspection, verification or repair process, any of the following procedures have been completed:

1. Disconnection of the door module power supply (including vehicle battery disconnection, fuse removal /replacement, disconnection of and harness elements between the supply fuse and the door module).
2. Disconnection of harness elements between the door module and the window lift mechanism motor(s).
3. Removal, refitting or replacement of any of the following components:
   1. Window Lift Mechanism
   2. Window
   3. Glass Seals
   4. Glass Seal Channels
   5. Upper Frame Finisher

SYMPTOM CHART

PINPOINT TEST A : MOVING GLASS SYSTEM INOPERATIVE (MOTOR NOISE CANNOT BE HEARD)

PINPOINT TEST B : MOVING GLASS SYSTEM INOPERATIVE (MOTOR NOISE IS HEARD)

PINPOINT TEST C : MOVING GLASS SYSTEM 'ONE-SHOT' FUNCTION INOPERATIVE

PINPOINT TEST D : MOVING GLASS SYSTEM(S) (WINDOW MOVEMENTS) ARE CONSISTENTLY SLOW OPERATING

PINPOINT TEST E : MOVING GLASS SYSTEM (WINDOW MOVEMENT) CONSISTENTLY ONLY PARTIALLY MOVES

PINPOINT TEST F : MOVING GLASS SYSTEM INCONSISTENTLY ONLY PARTIALLY MOVES

PINPOINT TEST G : MOVING GLASS SYSTEM OVERLY FLEXIBLE (WINDOW STABILITY) WHEN GLASS UP (WINDOWS ARE CLOSED)

PINPOINT TEST H : MOVING GLASS SYSTEM OVERLY FLEXIBLE (WINDOW STABILITY) WHEN GLASS DOWN (WINDOWS ARE OPEN)

PINPOINT TEST I : WIND NOISE BETWEEN VERTICAL PORTIONS OF GLASS SEALS AND MOVING GLASS (WINDOW)

PINPOINT TEST J : WIND NOISE BETWEEN UPPER PORTION OF GLASS SEAL AND MOVING GLASS (WINDOW)

PINPOINT TEST K : MOVING GLASS SYSTEM NOISY DURING OPERATION

PINPOINT TEST L : MOVING GLASS SYSTEM NOISY DURING DOOR CLOSE

PINPOINT TEST M : MOVING GLASS SYSTEM HAS NUISANCE BOUNCE BACK

PINPOINT TEST N : MOVING GLASS SYSTEM MOVES IN STEPS DURING OPERATION

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