Land Rover Defender: Towbar Control Module

DIAGNOSIS AND TESTING

PRINCIPLES OF OPERATION

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 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 (DMM) accurate to three decimal places, and with an up-to-date calibration certificate. When testing resistance, always take the resistance of the DMM leads into account

For a detailed description of the towbar control module system and operation, refer to the relevant section of the workshop manual

INSPECTION AND VERIFICATION

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 table below

DEPLOYABLE TOWBAR - DIAGNOSIS AND TESTING

Deployable Towbar - Security system status indicators and tones

The towbar control module is able to communicate various status and fault indicators through a speaker and the LED on the towbar deploy switch. Details of these status indicator codes are included in the table below. Further diagnostic information can be obtained by reading any DTCs set by the towbar control module

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