BCM VR VS in an old car

Wiring diagrams and questions
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Joined: Wed Oct 30, 2013 1:56 pm

BCM VR VS in an old car

Postby Mikestech0 » Thu Sep 19, 2019 1:47 pm

Hi guys
Im currently bench testing the above BCMs
I can get them to unlock and lock with the fob key but the problem im having is once unlocked 30 seconds later they self lock again. I do have and input wiring diagram which is kinda useful but im really after is a complete wiring diagram to work out what inputs are required weather earth or +12v to stop the unit rearming
Any help would be greatly appreciated
TIA

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Joined: Mon Sep 09, 2019 9:59 pm

Re: BCM VR VS in an old car

Postby picvrss » Thu Sep 19, 2019 2:59 pm

I can copy and post the page in the VR factory manual that has the door lock wiring and BCM interface for the central locking.

I'm at work at the moment, so I'll post later.

PICVRSS

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Re: BCM VR VS in an old car

Postby Mikestech0 » Thu Sep 19, 2019 3:11 pm

Thank mate that would be awsome :)

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Re: BCM VR VS in an old car

Postby Charlescrown » Thu Sep 19, 2019 4:29 pm

I wonder if it's the level of the BCM that's set to auto lock. My Vr doesn't do it but 30 seconds doesn't sound like the factory time.

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Re: BCM VR VS in an old car

Postby picvrss » Thu Sep 19, 2019 6:35 pm

There are at least two, 30-second timing periods involved with the VR BCM/Theft Deterrent System: one to passively arm after the ignition is switched off; the other, to switch off the dome lamp when all doors are closed.
Presumably, your test-bench setup has a minimum of connections, possibly only the constant battery feed to the module. If so, then the BCM in this situation will consider the ignition off and all the doors closed. In this state, it will lock the doors in response to a press of the key fob. However, when unlocking via the key fob, it will then passively arm and also turn off its internal dome lamp relay 30-seconds later, at which point if you were to press the key fob again, it will lock the doors again.

What I'm suggesting here is that, if you're assessing the unlocking/locking function by listening to relay clicks from within the BCM, then you're most likely hearing the dome lamp relay.

You may have an entirely different bench setup, though, in which case the above could be invalid.
Anyway, here is the VR door lock/BCM wiring diagram - hope it helps.
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Re: BCM VR VS in an old car

Postby j_ds_au » Fri Sep 20, 2019 4:57 am

picvrss wrote:There are at least two, 30-second timing periods involved with the VR BCM/Theft Deterrent System: one to passively arm after the ignition is switched off; the other, to switch off the dome lamp when all doors are closed.
Presumably, your test-bench setup has a minimum of connections, possibly only the constant battery feed to the module. If so, then the BCM in this situation will consider the ignition off and all the doors closed. In this state, it will lock the doors in response to a press of the key fob. However, when unlocking via the key fob, it will then passively arm and also turn off its internal dome lamp relay 30-seconds later, at which point if you were to press the key fob again, it will lock the doors again.

What I'm suggesting here is that, if you're assessing the unlocking/locking function by listening to relay clicks from within the BCM, then you're most likely hearing the dome lamp relay.

You may have an entirely different bench setup, though, in which case the above could be invalid.
Anyway, here is the VR door lock/BCM wiring diagram - hope it helps.

There's also a timer to turn off your lights in case you've forgotten, but I think that's longer than 30s.

Also bear in mind that the key fob has separate lock and unlock buttons.

Joe.

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