2004 bmw 6 series lock/unlock wire

This car uses same wire for lock and unlock.

How to make connection to alarm?

This is really too obvious but set your units lock and unlock to NEG (-) pulse and join them together.
Alternatively, probe around in the driver's door around the window switch (if it's in the door) or lock wiring, there should be a pair of NEG going wires for lock and unlock, extending the lock time for comfort close.

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Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

howie ll wrote:

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This is really too obvious but set your units lock and unlock to NEG (-) pulse and join them together.
Alternatively, probe around in the driver's door around the window switch (if it's in the door) or lock wiring, there should be a pair of NEG going wires for lock and unlock, extending the lock time for comfort close.

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Then how does the car know it is lock or unlock?
If I press lock, it might unlock, press unlock it might lock.

Not my problem, it's known as 1 wire sequential locking.
As I said that's how they've listed most BMWs since 99 but I found those extra wires in the DKP on 3 Series and at the door switch on 5 Series (which is essentially a 6 series).
Renaults use a similar system, just don't use the factory remote OR find those two wires.

-------------
Amateurs assume, don't test and have problems; pros test first. I am not a free install service.
Read the installation manual, do a search here or online for your vehicle wiring before posting.

Thanks howie