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BMW Vanos Solenoid Wiring


George GEP

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OK so i have such issue with mostly all bmws

when i wire Vanos solenoid to ECU  does not matter is it single vanos, double vanos M54 or S54 there is same issue

to not make things complicated lets talk about M52 vanos solenoid that has just switched +12v through relay and ground control

when i use OEM wiring and leave +12v feed from injector relay, i can not turn ignition off  when solenoid is connected to ecu, it back feeds everything

if i start engine, turn ignition off, engine is still running and meanwhile if i disconnect vanos solenoid it will shut everything off (as it should when ignition is off)

i'm talking about E36, E34, E46, E39 cars

it is not car / chassis specific it is wiring related.

i wired relay for vanos solenoid separately which does feed solenoid separately and relay activated by injector power relay.

but still does same thing :D it leaves ignition ON (but not always)

i put diode on power wire between vanos and relay.. worked for day and then it did same thing and now it does always - leave ignition on

 

how do u guys solve this issue?

 

used exactly those methods of wiring as well - no luck

vanos1.png

vanos2.png

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6 hours ago, Brad Burnett said:

Sounds as if the coil circuit has a constant +12v feed and not a switched feed.

no sir, i wired through relay that comes on and off with injectors relay (so that positive power source for relay power feed is not constant but switched)... but does not come off when vanos solenoid is connected. 

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