91 940SE power seat woes
#1
91 940SE power seat woes
picked up a cheap 91 940 SE wagon for my college son... I think this is our 6th volvo... car is otherwise in really good condition for a 240000 miler, runs great, drives great, brake rotors have no wear, tires are all good... got the car for $1700 because its cosmetically rough, clear coat is peeled off the top surfaces, etc.
The drivers seat doesn't work, its the power seat withOUT the memory and the really big switches. the passenger seat works fine. there is power at the various wires on the switch module, and the buttons seem to turn things on/off, but I don't get any attempt at motion in any direction, no hum or click or nada. I'm thinking of trying to unbolt the seat rails so I can get under there and check the motors.
also, the front leather seats are trashed. any suggestions for the best seat covers for these for not too much money? I gather this 940 SE is really a 965 (thats even what the volvo serial number plate under the hood says)... I dunno if that impacts the seat shape. I google various places online that claim to make full custom seats in OEM style velour w/ foam backing for any model car, including 940/960. Anyone got a vendor they had a good experience with?
The drivers seat doesn't work, its the power seat withOUT the memory and the really big switches. the passenger seat works fine. there is power at the various wires on the switch module, and the buttons seem to turn things on/off, but I don't get any attempt at motion in any direction, no hum or click or nada. I'm thinking of trying to unbolt the seat rails so I can get under there and check the motors.
also, the front leather seats are trashed. any suggestions for the best seat covers for these for not too much money? I gather this 940 SE is really a 965 (thats even what the volvo serial number plate under the hood says)... I dunno if that impacts the seat shape. I google various places online that claim to make full custom seats in OEM style velour w/ foam backing for any model car, including 940/960. Anyone got a vendor they had a good experience with?
#2
there is a relay under that seat. you have 940 seats, power. u can replace them with non powered ones, no problem... any 940 1991 to 1995, or 960. or you can buy the leather covers used, they come up on ebay, etc. or junkyard seats can be swapped left to right, bottom cushion is easy, seat back cover from the pass. seat will fit the driver's.
#3
#4
I did better. first, I found a wiring diagram for the non-memory seats. ok, orange is 'control' power for the stop button, red is 'real' power for the motors, black is ground, and the various other wires go to the motors. inside hte switch module there's a relay that the stop button activates, this relay provides power to the other switches to actually power the motors. per extensive prodding with a volt meter it was evident that this relay wasn't working....
so I figured out where the other side of this relay had to be on one of the switches and ran a wire from the red to said terminal... voila, now motors all work, but no stop button. since not a single other brand of car I've ever seen has a stop button on their power seats, I figure thats tolerable.
so I figured out where the other side of this relay had to be on one of the switches and ran a wire from the red to said terminal... voila, now motors all work, but no stop button. since not a single other brand of car I've ever seen has a stop button on their power seats, I figure thats tolerable.
#5
I did better. first, I found a wiring diagram for the non-memory seats. ok, orange is 'control' power for the stop button, red is 'real' power for the motors, black is ground, and the various other wires go to the motors. inside hte switch module there's a relay that the stop button activates, this relay provides power to the other switches to actually power the motors. per extensive prodding with a volt meter it was evident that this relay wasn't working....
so I figured out where the other side of this relay had to be on one of the switches and ran a wire from the red to said terminal... voila, now motors all work, but no stop button. since not a single other brand of car I've ever seen has a stop button on their power seats, I figure thats tolerable.
so I figured out where the other side of this relay had to be on one of the switches and ran a wire from the red to said terminal... voila, now motors all work, but no stop button. since not a single other brand of car I've ever seen has a stop button on their power seats, I figure thats tolerable.
#6
#8
no, the important one was the red wire I jumped to the output side of the relay (which I figured out by studying the traces on the bottom of the PCBA and comparing it with the wiring diagrams). the wire jumper you use has to be thick enough gauge to handle all the motor power (eg, as thick as the original red wire).
#11
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ProactiveMan (05-17-2020)
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