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door lock sleuthing
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Posted by Ken Fisher [Email] (more from Ken Fisher) on Thu, 18 Mar 2010 23:00:12 Share Post by Email
In Reply to: Re: voltage at rear door lock?, SRS900S, Thu, 18 Mar 2010 14:20:26
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Hi. Continuity measurements will tell you very little. There are two groups of parallel wire pairs: (1)driver's door, left rear door, and gas filler door; and (2)passenger front door, passenger rear door.

The controller has two relays, one for each group. On the pcb they appeared to be toggling a single contact. The relays basically flip a ground connection to the actuator wires. The actuator circuits are independent of everything else. There are two capacitors on the controller pcb that may have failed, they source current to ancient CMOS chips from the late eighties. The controller appears to have been built in a cave near Karlsruhe, a primitive single-sided pcb. Bad grounds to the chassis at the controller have been reported by others.

The splice to feed the right side actuators is in the front right fender harness(later cars, post 94). I would put an oscilloscope or digital multimeter with a min/max voltage capture feature on the rear door wire pair. If you can't catch a pulse on successive button presses, it is likely that one wire is broken to that door. The relays bounce, they can generate multiple pulses for one remote button press. The pulses are ~150,200 milliseconds wide. Good luck.


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