The complete automotive resource for buyers, sellers, and owners like you.
Car, Truck and SUV Forums at Roadfly
+ Bentley Forums
+ BMW Forums
+ Cadillac Forums
+ Chevrolet Forums
+ Ferrari Forums
+ Jaguar Forums
+ Lamborghini Forums
+ Lotus Forums
+ Mercedes-Benz Forums
+ Maserati Forums
+ MINI Forums
+ Porsche Forums
+ General Discussion
+ Marketplace Forums
OOOPS!..Here it is About Central locking. (archive)

[ Follow Ups ] [ BMW 5-series Message Board ] [ Msg. Board FAQ ]

Posted by Chester Siembab on August 15, 1998 at 13:24:14:

In Reply to: I thought that was for the power windows. n/m posted by Toan Ho on August 13, 1998 at 17:13:06:

Sorry, I must've been drunk at that time.

Power lock system works this way:
- there is a motor in eevery door and a microswitch in driver, front passanger and trunk door units.
- there is a central controler (I think in driver side kick panel) which if it gets a signal from a microswitch that lock has been operatwd, it sets for about a second, +12V on one side of a motors and GND on the other (all + and all - sides of all motors are tight together) if you are closing and reverses polarity when opening.
- Driver side and trunk are master - control all doors to close and open front passanger doors can only open all doors. Rear units are only slave type.
- All added - remote operators simply tap into the two wires around the driver or trunk units and flip-flop the motor polarity.
- In your case, IF it is done that way and wires were shorted, you could't flip the polarities so wiring is probbably OK.
- I assume that you've checked the fuse.
- If you are skilled with voltmeter you can pipoint easy where the problem is.
Because of your controler probbably supplies its own power, I think it might just be the controler not sensing or not switching (in this case trunk an/or driver side are not oprating and passanger door doesn't open - try junk yard and repleace the control unit) or if trunk lock still warks - passanger side microswitch is bad (can't really be repaired - junk yard again)
Hope it helps.

: no message

Follow Ups:

[ Follow Ups ] [ BMW 5-series Message Board ] [ Msg. Board FAQ ]
Questions, comments, or problems, please visit the Roadfly help desk. Logo © 1997 - 2018 Jump Internet Inc. All rights reserved.