Questioni have a 2002 landrover discovery series 2. Twice now with no warning the car runs great and then suddenly it will not start. Both times there is a burning smell and it appears smoke comes out of the center console. I have replaced the cables and tested both the battery and starter. They both tested out ok. I have re-installed the battery and starter. It still won't start!! and now the added bonus is when I try to start it the hazard lights com on without pushing the button. AHHHH I do not have much patience left.
AnswerHi Lance,
this sounds more like a Body Control Unit (BCU) or Intelligent Driver Module (IDM) problem. Perhaps there is an electrical short in the wiring between these two electronic components.
The BCU:
General
The Body Control Unit (BCU) is located behind the passenger glovebox and is connected to the main harness by four connectors on its bottom edge and an additional connector located on the side of the BCU casing. Mounting the BCU behind the fascia makes it reasonably inaccessible for intruders to disable the anti-theft system.
The BCU uses solid-state microprocessor control to perform logical operations and timing functions for a variety of the vehicle's electrically operated systems, these include:
Door locking.
Anti-theft alarm and immobilisation system.
Exterior lighting including direction indicators and hazard warning lamps.
Courtesy lighting.
Wipers and washers.
Electric windows and sunroof.
Heated windows.
The BCU also communicates with several other electronically controlled systems such as the EAT ECU and SLABS ECU and also has a datalink between the Intelligent Driver Module (IDM) and the instrument pack. The datalink is a low speed bus capable of transmitting and receiving messages at a data rate of 10,400 bits per second. Additional inputs and outputs to peripheral devices are included which are necessary for determining vehicle status for particular logical operations e.g. crank, ignition key inserted, fuel flap enable etc. The BCU receives its power supply from the engine compartment fuse box, and is protected by a 10 A fuse.
The BCU communicates with the IDM to provide the control signals to perform power switching operations in conjunction with dedicated relays.
IF either component is faulty, you'll need the services of an experienced LR mechanic with access to a Testbook device.
IF you've determined that its not the starter or solenoid and the battery is in good condition THEN you have to start looking at the ignition sequence which includes the BCU and IDM.
You mention seeing smoke rise from the center console - has to be a short. Find the short and I'm sure you'll find the problem. Meanwhile, check and verify all the fuses.
Best of luck,
JohnMc
NB: not all burnt out fuses LOOK damaged. I've been fooled a couple of times.
