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when I get hit with one of these old-aged Volvo problems, the first thing I think about is what's gone kaput due to age?
The central locking relays are on the relay bar under the center dash air vents, there's apair of them. They look the same as the nearby power windows relay. They have no circuit board in them, so no re-soldering. However, they can overheat - and that may mess up one of the contacts. No experience of this on any of my 240s.....yet.
The wires going into the driver's door get flexed a lot in 14 years. IMHO that's a possible place to look. But first, a listing of symptoms again, please.
1. Using key....a. Which doors unlock OK?....b. Which doors lock OK?
2. Using door knob....a. Which doors unlock OK?....b. Which doors lock OK?
3. If other than all doors, then which ones?
Here's what I understand you have:
1.a is LF door only. 1.b is not stated
2.a is not stated, 2.b is all doors.
In the driver's door the key has a switch, and the up/down rod on the knob has a switch. Either switch can fail, due to dried up lubricant, moisture-assisted oxidation, sma;ll creatures living in the door, who knows?
If the action of those switches can be simulated, you can prove whether or not the relays are bad, or one or both door switches. If it's the switches, don't waste time working with the relays, and vice-versa, if it's the relays, don't waste time pulling the door trim panel.
Find the connector that's between the door and the rest of the circuit. It may be inside the rubber housing that's between the door and the "A" pillar between the door hinges, or maybe inside the kick panel surrounding the fuse panel. If you can't access that connector, yo may have to pull the trim panel anyway. Not a big deal. Have some heavy plastic sheeting to make a new water shield, the old ones usually crap out.
Three wire connector, black, green, red. Black = ground. Green = locking when hot. Red = unlocking when hot. Use a long jumper wire to apply 12volts to the red wire, you should get unlocking. Apply 12 volts to the green wire, you whould get locking.
Good Luck,
Bob
:>)
PS The wiring info is from a Volvo Wiring Diagrams book for the 1987-1988 240s. I would expect that your model is the same, but no guarantees. OK?
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