The Body Electronic Control Module as many people know all to well is the large control unit that sits under the drivers seat and controls the majority of electrical circuits on a P38 Range Rover. It was fitted to P38's from 1995-2001

The Becm can cause no end of problems. When tackling issues with a P38 it is difficult to Diagnose if the Becm itself is causing a fault or whether it is the wiring or a component failure that is causing the Becm to malfunction. The Becm has no Fault Diagnosis as such and to make things difficult the most important information in it is locked. This prevents us from fitting a second hand unit to replace a faulty one or using a donor one for testing.

Be very carefully, trying a second hand unit in your Range Rover can cause the dashboard to show a higher mileage. The Becm verifies its own mileage against the dash. The highest mileage is then written to both. If this has already happened send your dash along with the Becm and it can be rectified.

You can have a complete test on your Becm for only £48 Excl vat & Carriage
(This includes it being unlocked)
Below is a selection of faults often experienced with the Becm

 

 

	Electric Window Failure Alarm Problems Engine Will not Crank Immobiliser Problems Key Code Lockout Fuse Failure Warning Battery Drain Alternator Fault No Instrument Cluster Display Electrical Fault Warning Central Locking Failure Incorrect Mileage showing Lighting Faults Transfer - Neutral Lock Rear Wiper Inop Wing Mirrors inop No Hevac Seat Electrics failure No Cruise Control Air Suspension Faults Remote Key inop No Selector Lever Display

Sending your Becm to be Tested

If you have problems with your vehicle and you don't know whether it is the Fuse box, Becm or wiring then easiest thing to do is send your Becm, Engine Ecu and 1 working key to be tested.

Your Becm will be unlocked and and any coding issues can be corrected.

If the Becm is found to be ok then wiring diagrams and instructions will be sent back with your unit indicating which circuit/s are at fault. The diagrams will enable you to quickly locate and rectify the fault returning you problematic Range Rover back to perfect health.
This is also applicable if your Becm has been repaired. You can prevent a situation were it can be blown on reconnection because the existing fault hasn't been rectified.

The reason for sending the Engine Ecu and a Key is for the Security and programming. The Becm, Engine Ecu and Key are all security matched. When all three are connected up, as they would be on the vehicle, every function can be tested. The security codes can be checked and matched if need be. when you receive your units back you can just plug them straight in without the need for programming.