Electrical - Warning Lamps/Various System Malfunctions
No: 86/07/04/NASRef:
Issue: 1
Date: 28 October 2004
False BCU Input Signal
AFFECTED VEHICLE RANGE:
Range Rover (LM) up to 4A162652
SITUATION:
FALSE BCU INPUT SIGNAL
A false input signal to the Body Control Unit (BCU) can result in a series of symptoms (hazard lamps flashing, doors unlock, radio goes mute and the interior lights illuminate). An electrical spike within the internal electrical circuits may be the cause of the problem.
RESOLUTION:
REPLACE AND CONFIGURE THE BCU
Should a customer complain of these symptoms, replace the BCU and configure the new unit using T4.
PARTS INFORMATION:
YWC000922......BCU Qty 1
DDW WARRANTY CLAIMS:
DDW requires the use of causal part numbers. Labor only claims must show the causal part number with a quantity of zero.
Normal warranty policy and procedures apply.
Material allowance is included in labor operation.
REPAIR PROCEDURE
1. Connect T4 to the vehicle and load disc Range Rover 14 or a later version.
2. Begin a new T4 diagnostic session and perform the following observing all on-screen instructions:
^ Select "System Diagnostics"
^ Select "Security"
^ Select "Vehicle Maintenance"
^ Select "ECU Renewal"
Select "Body Controller"
NOTE:
GTR lookup sequence is as follows:
GTR Home > NAS > Service Information / LM New Range Rover/2004 > Workshop Manuals > RR WSM Service Procedures > Bookmark "CONTROL UNITS AND RELAYS/REPAIRS/Body Control Unit (BCU)" > Section 86.55.75
^ Refer to GTR section 86.55.75 and when prompted by 14 follow the procedures to replace the Body Control Unit.
^ Configure the new BCU with T4.
3. After the BCU has been configured, program the remote handsets.
4. End the diagnostic session and return to the "Welcome" screen.
5. Disconnect T4 from the vehicle.