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Re: Central Locking Module question, 95 SAAB 9000CS Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Tue, 21 Jun 2005 10:03:49
In Reply to: Central Locking Module question, 95 SAAB 9000CS, Richard Chang, Tue, 21 Jun 2005 07:50:21 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The CLS works by sending a 1 second pulse across the actuators. If the actuators work about half the time, that is telling me that the voltage/current provided by the CLS is on the hairy edge of being enough to pull in the actuator solenoids.
The CLS gets power and ground ,and uses relays inside to send the power out to the actuators - + on one side, ground on the other to lock, reversed to unlock.
The first thing I would do is stick a voltmeter on the CL box ground, and measrering against a known good ground (chassis, battery), see what the box ground does during a lock or unlock. Most digital voltmeters update faster that 1/second, so you should see some indication flash. Or you could use an analog voltmeter. It would be reasonable for the box ground to 'rise up' a few tens of millivolts. If it rises up more than about a half-volt or so, that's a half-volt the lock actuators aren't seeing. Fix the ground.
Then do the same for the power to the box. It should be nice and 'stiff' - not change much, if at all, when the locks engage/disengage.
The reason for the voltage at the box to drop, or the ground to rise, is either that there is a poor connection in the power supply / grounding wiring, OR one or more of the lock actuators is pulling too much current. Or a combination of both. If the voltage supply and ground seem OK, the next thing to try would be to disconnect 1 door actuator, leaving the other 4 (don't forget the gas cap lock!) alone. See if the locking is much more reliable with just one of them disconnected. That actuator may be sticky, or just pulling too much current. The good news is that the actuator motor itself is pretty much the same over all the 9000's, so you can pull it out of any junker.
posted by 192.249....
, Tue, 21 Jun 2005 10:03:49 <-- Viewing This Message
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