Land Rover Defender: Locks, Latches and Entry Systems

DIAGNOSIS AND TESTING

PRINCIPLES OF OPERATION

For a detailed description of the Locks, Latches and Entry Systems, refer to the relevant Description and Operation section in the workshop manual. REFER to: Handles, Locks, Latches and Entry Systems (Handles, Locks, Latches and Entry Systems, Description and Operation).

INSPECTION AND VERIFICATION

CAUTIONS:

• 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.
• The vehicle latches are non-serviceable. Lubrication must not be sprayed into or around the door, hood, fuel flap or tailgate latches. Care should be taken when washing the vehicle to not spray water at or into the latches

NOTES:

• If a control module or a component may be 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 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.
• 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 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

NOTE: Before commencing fault diagnostics, make sure that the vehicles' normal locking/entry features (for example, internally locked mode, externally locked mode, single vs double locking modes, single point entry vs global entry modes) are not the cause of the locking/latch issues reported by the customer).

PINPOINT TESTS

PINPOINT TEST A : INITIAL CHECKS

PINPOINT TEST B : EXTERIOR DOOR HANDLE TESTS

PINPOINT TEST C : INITIAL CHECKS

PINPOINT TEST D : INTERIOR DOOR HANDLE TESTS

PINPOINT TEST E : DOOR AJAR TESTS

PINPOINT TEST F : DOOR LOCKING TESTS

PINPOINT TEST G : EMERGENCY KEY BARREL TESTS

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