4.6 p38 switch pack + more problems

Hello, Got a Range Rover in with the switch pack dead, radio dead, sunroof dead, connected up Faultmate and cleared a few faults unrelated to this one then went to try to open the windows through the faultmate/laptop and they all opened fine as did the sunroof and front windscreen wipers. Dont have the software for the hevac or radio yet. he uses a battery pack to make the radio work pluged into the cigar socket!!! this also seems to light the Hevac led up but no functions

Looking through my folder of usfull information the faults all point to two sockets on the BeCM C258 and C626 outputs, all but the windscreen wipers. he also reports that his rear screen wiper dose one sweep on start up too, this i think is the signs of a diying BeCM.

TWO CHOICES.

1) repair the BeCM. (sm035)

2) clone his information onto a known working BeCM. (Sm035)

As his BeCM is getting a little tired i thought of the second option as i think the C258 looks a fine socket to drink a lot of coffee from the center consol mini table
anyone think differently please let me know

If you can operate the windows etc from Faultmate it would suggest it's not the BECM. Switch packs are a known failure item why go for the BECM?

I Agree, its not the Becm... they wouldnt work at all... there might be a couple of faults. you may have replaced the switch pack with another faulty one... also the door out station... bad earth... check with rave, im sure alot of what you are describing are on the same earth location.

Datatek said:

If you can operate the windows etc from Faultmate it would suggest it's not the BECM. Switch packs are a known failure item why go for the BECM?

Click to expand...

That was my first thought but if i can illuminate the socket that enters the BeCM this is the cheaper option than buying a switch pack @ £70 secondhand, i admit it would be an easy option to replace the switch pack but he also has a dead radio that is feed from the same Becm socket (c258) when i scanned his system first it missed his aircon...

SM022 BECM :- FITTED VIN 368704
1997/04/2
AUTO GEMS
SM026 LUCAS EAS :- FITTED
SM001 LUCAS GEMS :- FITTED
SM028 BOSCH AUTO BOX GS2.38 :- FITTED
SM012 TRW SPS TYPE 1 AIRBAG :- FITTED
SM021 WABCO C TYPE :- FITTED

All operations from the switch pack use this same socket in the BeCM.

Removing the BeCM is a easy 10 min job that is there already and can be checked for dry joints on the sockets where trying a switch pack would ammount to the cost of the switch pack on top of the cost of labour.

I just like to start at the cheapest alternative first, he also reported water damage and the drivers carpet was still wet, not from the o ring problem

do you think when connected to the Fault mate via the obd2 the path took in the wiring goes straight to the BeCM in Sm022 mode or through the switch pack wiring then to the BeCM. Also as the switch pack is a outstation this should have come up as a fault when tested.

The more ideas the better, thanks.

dougdotcom said:

That was my first thought but if i can illuminate the socket that enters the BeCM this is the cheaper option than buying a switch pack @ £70 secondhand, i admit it would be an easy option to replace the switch pack but he also has a dead radio that is feed from the same Becm socket (c258) when i scanned his system first it missed his aircon...

SM022 BECM :- FITTED VIN 368704
1997/04/2
AUTO GEMS
SM026 LUCAS EAS :- FITTED
SM001 LUCAS GEMS :- FITTED
SM028 BOSCH AUTO BOX GS2.38 :- FITTED
SM012 TRW SPS TYPE 1 AIRBAG :- FITTED
SM021 WABCO C TYPE :- FITTED

All operations from the switch pack use this same socket in the BeCM.

Removing the BeCM is a easy 10 min job that is there already and can be checked for dry joints on the sockets where trying a switch pack would ammount to the cost of the switch pack on top of the cost of labour.

I just like to start at the cheapest alternative first, he also reported water damage and the drivers carpet was still wet, not from the o ring problem

do you think when connected to the Fault mate via the obd2 the path took in the wiring goes straight to the BeCM in Sm022 mode or through the switch pack wiring then to the BeCM. Also as the switch pack is a outstation this should have come up as a fault when tested.

The more ideas the better, thanks.

Click to expand...

Looking at the wiring, I would say that the command to operate the windows is direct from the Faultmate to the BECM, but it should of course also be able to interrogate the switch pack outstation. If the outstation does not respond to interrogation either the switch pack/outstation is dead or the connector at the BECM is corroded or there is a wiring fault or it is as you think the BECM. My bet would still be the out station or the connector to the BECM in view of the damp.
Irishrover will correct me if I'm wrong.

1.If you can remove a BECM in 10 minutes it's nothing short of a miracle, unless seat and trim are already off of course!

2. Any damp on drivers side may well cause issues; have you checked switch pack for power/continuity when not using Faultmate (connected on opposite,dry, side of car)?

3.PM Irish and he'll help if possible........if it is BECM, he's your man!!