P38 central locking

Hi Chaps

I have a 1997 Range Rover and the central locking has an issue.

It all started a while back when the left front door solenoid started making a whirring noise as it was being locked. It still worked fine though so I kind of ignored it for a while until it stopped working completely one day.

I then bought another lock assembly from a known working vehicle and fitted it in the door and it still didn't work. I then tried it on the connector in the right front door and the lock works just fine.

I then swapped both the door outstations over and once again, nothing on the left door working but the right side is fine.

Today I traced all the wires between the BECM and the door outstation and checked them for damage and did a continuity test, no problem there. Also no problem when testing the loom from the outstation to the lock assembly.

So, As far as I can see, no wiring problems, no lock solenoid problems and the outstation is fine.

Any other thoughts what could have happened? Can the BECM sense a problem with the solenoid and turn it off until reset with the LR test book or could there be a solenoid or something in the BECM that has stopped working?

Cheers

Craig.

You have done all the basics and tested the wires hopefully with the becm disconnected so not to spike the becm with the contitnuity check sounds like a possible becm fault the tests can be done on textbook to confirm

just for info, if you did take the lid off the becm its not quite as frightening as all that on the inside. you can always check for a bad connection or a duff relay although you should try voguese's advice first.


pic off rangerovers.net

Cheers guys

The test was done with the BECM disconnected so that's good.

I have taken the top off the BECM before and saw all the relay's in there but couldn't decide if any off them have any function to the locking. There are more relays in the door outstations so figured they do the job of switching the higher currents rather than the BECM. The wires I tested from the BECM to the outstation were all fairly small, signal cables I believe.

Does anyone know what relays do what in the BECM?

I'll see if I can pop down to the local Land Rover dealer one day and get it on the test book and see if there are any registered faults on the BECM.

Thanks again

Craig.