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Re: power lock issue (differs from the usual c900 symptoms) Posted by Bill S [Email]  (#1209) [Profile/Gallery]
(more from Bill S) on Mon, 25 Mar 2013 11:00:24
In Reply to: power lock issue (differs from the usual c900 symptoms), 86spig, Mon, 25 Mar 2013 10:29:55 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Are you certain that the fuse blows when you turn on the ignition, rather than when you try to lock or unlock the doors? The central locking circuit should have power whenever the battery's connected (+30 in the diagrams), and isn't normally tied in to any circuit that's switched by the ignition (the ignition switch itself or the ignition switch relay, etc), so it would be hard to explain why the central locking would draw enough current to blow the fuse when the ignition's turned on.
If the fuse blows when you lock or unlock the doors you could have a short to ground on one of the wires to one of the lock actuators. With the controller disconnected you could probe pins 7 and 8 on the connector (the wiring side, not the controller itself) and see if either is shorted to ground. If either one is you'll see a path to ground through both, but one path will be through the actuators and should show a higher resistance.
You could try probing pins 1 and 2 (again, on the connector) and seeing if either of them is grounded all the time. Those pins normally seek a ground through the switch in the driver's door for "lock" or "unlock" command to the controller. I think the switch is supposed to be a momentary switch, and if so if it sticks in either position (or the associated wire is shorted to ground) it could (emphasize could) cause the controller to draw too much current and blow the fuse.
The central locking circuit is grounded by the handbrake, but an open ground should just cause the system to not work, not blow the fuse.
Hope that helps!
, Mon, 25 Mar 2013 11:00:24 <-- Viewing This Message
, Mon, 25 Mar 2013 12:04:07
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