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Wiring harnesses for 740 central locking 700 1992

posted by  Arthur240 on  Thu Nov 5 02:02 CST 2009
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last visit: Mon Oct 15 05:15 CST 2012
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After a quick and expensive visit to my Volvo mechanic, (for high-voltage problems) the central locking system on my 745 went flaky. The driver's side and tailgate solenoids work fine - the other three door solenoids don't. Since three solenoids are unlikely to quit all at the same time, I suspect either the relay (which still operates two doors) or the wiring harness or a bad ground. Mechanic says I need three solenoids, but I doubt that. I think he glitched the wiring harness.
My questions:
1. Where is the wiring harness for the passenger front and rear and driver's side rear doors? Since two locks operate, there must be a second harness. I prefer to start there to trace the fault before pulling door panels.
2. What is the number of the central locking relay, so I can swap out. Number is illegible on the present relay.






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