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Alarm Circuit Questions - Relay Pinout and/or Wiring Diagram? Cost? 850 1995

posted by  jhalbert on  Sat Jan 22 15:23 CST 2005
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last visit: Mon Apr 8 00:29 CST 2013
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Hi -
The car developed a problem with false triggering of the alarm and "stuck" turn signal lamps. Traced this to a faulty alarm relay, which is a double-wide relay that plugs in under the dash, underneath the engine compartments fuse/relay box.
I figured that I would just pull the relay until I can get a new one, but then the car wouldn't start! It turns out that the relay is part of the wiring from the ignition switch (terminal 50) to the starter solenoid - so you can't start the car unless the relay is plugged in. If I leave the relay plugged in, I have to pull fuse #13 to suppress the original problem, but that disables turn signals and high beams.

I want to leave the relay out termporarily and substitute a short jumper with male spade terminals to re-connect the starter solenoid, but I need to know which relay socket slots to plug the terminals into.

The details of this wiring are mostly not found in the Haynes wiring diagrams.

1. Does anyone have a good diagram of the alarm circuit wiring, including relay terminal ID numbers? If you could send a scan of it, that would be great. At minimum, I need to know which two relay terminals are in series with the starter wiring (the Haynes manual says "1B" and "5B", but those IDs do not correspond with the molded numers on the relay pins.

2. Where is the cheapest I could purchase a new or perhaps good-used alarm relay? - I'm afraid of how much this item may cost. The Volvo part number is 9128903.

Thanks in advance for any help.

Joel in Tucson
'61 - '95 544, P1800, 122, 1800ES, 164, 240, 850





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