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door trigger wires


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chassis 
Copper - Posts: 244
Copper spacespace
Joined: September 21, 2014
Location: South Africa
Posted: November 04, 2014 at 4:38 AM / IP Logged  
Why do some vehicles have separate door switch wires for each door,like some bmws?
Do it once,do it right - This means no short cuts. You never get paid twice for having to do the job twice because it wasn't done right the first time.
davep. 
Gold - Posts: 644
Gold spacespace
Joined: May 27, 2011
Location: California, United States
Posted: November 04, 2014 at 9:00 AM / IP Logged  
The short answer would be: So that Driver Information Center indications can be generated. IE, "Left Rear Door Ajar". In the old days, there was a single "door ajar" indicator, and the pin switches were common to each other.
Certain BCM functions such as dome light strategy, RAP deactivation, key-in-ignition buzzer, etc all require knowing which door is open, hence the individual switches and circuits.
chassis 
Copper - Posts: 244
Copper spacespace
Joined: September 21, 2014
Location: South Africa
Posted: November 04, 2014 at 9:23 AM / IP Logged  
So that's why we need to diode the switches.I understand 100%
Thanks
Do it once,do it right - This means no short cuts. You never get paid twice for having to do the job twice because it wasn't done right the first time.

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