vr bcm fault?
My body control module wont flash the indicators when you lock the car with the keyhead.It flashes twice when you unlock it ok so the indicator/bulb circuit is fine.
I wouldnt care but it uses that input to trigger the alarm upgrade I fitted a few years ago to arm so it doesnt work either.
Tried 2 other same level and part number bcms but they all wont flash the indicators...surely they all cant be faulty?...must be something else on the car...any ideas?
This is my vr that I rebuilt ....CLICK HERE to see my vr on Cardomain
......if you want to check it out......Anyway make sure you rubbish a ford daily ....I am a 4DH8RZ Club lifetime member .................new members joining everyday
Try disconnecting the alarm upgrade and see if it flashes then.
Yep did that ....no joy even disconnected the l/h feed wire(its the trigger wire to the alarm) from the bcm so only the r/h would flash.Originally Posted by jc58nc
The last time I tried a different bcm it was disconnected so its nothing that to do with the alarm that is blowing something up in the bcm as you connect it for the first time.
The flash circuit to the indicators is a simple power feed switched across a relay contact ...only the relay is controlled by the electronics in the bcm.Theres no influence on the bcm by whats on the end of the indicator circuit since its electically isolated.
Could be your key remote with a faulty lock button?
Do you have a spare to try?
No sorry you mentioned you tried other BCMs, you would have had to have their key remotes to use them.
The two different remotes had keys with them ..both were one button type and they all did the same thing.....the door locks go down and everything locks so it is getting the signal from the keyhead ok
I can only suggest try your BCM in another car or borrow a BCM from a car that you know it was working OK.
Also check the wattage of the indicator globes, higher wattage may upset the BCM when it gives out the "one" flash but OK on 2 flashes.
Yep thats a idea...but I dont know anyone who has one close but Ill keep looking...the bulbs shouldnt make a difference as the circuit is a power to a relay contact and the other side out to the pos side of the lamp...and theres only one side connected anyway...but thanks for your interest ..when I find out what is causing this Ill post it up
Donating Member
on my vr the left side wouldn't flash on locking but everything would arm. went back to autobarn (thats where my aftermarket alarm came from) and told them that i think that the alarm has stuffed it up, but the guy said that they don't run power from the bcm to the alarm just use a signal feed. i thought he didn't know what he was talking about because to get a signal of some sort you need power. any way went to peter page holden and got them to check it. they looked at it and they were gunna give up but they took it to an auto electrician and found a one way diode ( only allows power to flow one way) fitted to the indicator flash wire had stuffed up and replaced it. so see if any diodes that run to the alarm or indicator flash wires need replacing. if not see an auto electrician. good luck.
Grandpa
nicks idea stands to reason, the output that is pulsed is the same circuit so it really has to be related to the aftermarket thing
Rob
One other point I just picked up on while reading about BCMs and key readers is if any of your doors aren't shut properly (earth signal from a door switch) the indicators will not flash to alarm the driver that the car doors are not secure. Could be an earth fault?
Yep that gets the brain cells ticking over...took out the white and white blue wires out of the plug feeding the bcm YB 139 which are the earths for drivers and other doors and disconnected the instrument connectors feeding the light switch and the white/green out of YB139 that is the dome light drive...still no flash on lock so I can rule those inputs out .
My alarm trigger wire that was connected to the light blue l/h indicators feed from the bcm is disconnected atm and when it was connected it had a diode in it anyway.
What I did try is while inside the car I pressed the lock function with the keyhead and the locks went down and the theft deterent led flashed on the console and as always the indicators didnt flash.
I put the key in the ignition and turned it to start without unlocking it with the keyhead and the theft deterent diode was still flashing .....it started and ran no worries but the diode stopped flashing....does this mean that the theft deterent part of the ECU isnt working and that is why I have no flash on arming to alarm me that something is wrong?
Maybe someone with a vr could try this on their car for me to see if this is normal.
Gee this is a saga but I am goin to beat this! At least I am learning something.
Grandpa
the immo disarmed due to the key reader around the ignition barrel. its normal
looking at the wiring diagrams the output that is pulsed is the same when locking & unlocking, if the problem is still evident with another BCM it must be related to the aftermarket alarm thing.
Rob
Last edited by Doctor Bob; 10-07-2006 at 07:45 PM.
Donating Member
mine still starts but my alarm goes mental. as doctor bob said, the immobiliser got the right signal and let it start. cos if your remote fails and you unlock the door with the key your immobiliser stays armed until it finds the right signal from the key when started. one way to check it is take the key out of the head an try start it. if it starts then it is possible that its not working properly. if it doesn't start (not turning over/nothing happens) then it is working properly.
At the moment I have no alarm (mongoose brand)connected to the indicators the door locking feeds to it are still connected however ,no wire from the door switches and no feed to the dome light and still no joy...I was trying to take out everything that is a input that could be causing a problem that might cause the bcm not to flash the indicators as a alert to say something is not happening like it should .
Finally I fixed it....I think.
I took out fuse 23 from under the bonnet marked engine on the cover and checked it out ...it looked ok.
So I put it back in....everything works now...indicators flash once to lock and twice to unlock....now I can put everything back together but turned out to be a bloody expensive fuse
Does anyone have a reason why this action caused the bcm to flash the indicators again? Maybe a high resistance at the fuse wedge but I thought it would cause other problems too.
Have you got a series one or two VR?
The series one runs a seperate theft detterant module on the passenger side...
Its built in mid 94 dont know what that makes it....but it is fixed now hopefully forever.
Bad news ...its gone again but I might be on to it.
The drivers door wont lock the other doors by pressing down the button...must have dodgy contacts or wiring connections in the lock motor.
When you lock it with the keyhead all the locks go down ....indicators dont flash but you can hear the faintest noise coming from the drivers door of the solenoid trying to work for about 3 times even though the lock is down.
Finally fixed it ..it was the brown/red wire in the loom just as it went through the door was open circuit or broken inside the loom in the door...I think it was for the lock request for the driver door. Rejoined and its all good now after about 2 months of it playing up.
Extended saga but I learnt something.
Congrat's markovr, time and patience wins out in the end and you have resolved the fault!
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