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
- Verify the customer concern
- Visually inspect for obvious signs of mechanical or electrical damage
Visual Inspection
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- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step
- 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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Deployable Towbar Control Module
REMOVAL AND INSTALLATION
GENERAL EQUIPMENT
REMOVAL
NOTES:
This procedure contains some variation in the illustrations depending
on the vehicle specification, but the
essential information is alw
SEE MORE:
Control Diagram
CONTROL DIAGRAM - 1 OF 2 - NORTH AMERICAN SPECIFICATION VEHICLES
A = HARDWIRED: AX = FLEXRAY: BA = HIGH SPEED (HS) CONTROLLER AREA NETWORK
(CAN) HUMAN MACHINE
INTERFACE (HMI) SYSTEM BUS.
RCM
IPC
BCM/ GWM
Second row seatbelt retractor pretensioner - Right
Second row seatbelt retractor pretens
Steering wheel phone controls
Make sure the relevant safety warnings
have been read and understood before
operating the phone features.
Press to answer an incoming call. Press
and hold to end a call.
Thumbwheel: Rotate up to increase,
or down to decrease, the volume level
during a call.
Press to make a call using voice
