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98 V70 Door lock: Doesn't work after replacing heat sensor with copper wire

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
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98 V70 Door lock: Doesn't work after replacing heat sensor with copper wire

Post by 1337 » Sun Apr 17, 2016 7:53 pm

My door locks sometimes don't go up and down if in hot weather or if used repeatedly. I explained the issue in this thread:
http://www.matthewsvolvosite.com/forums ... =1&t=75316

I followed RobertDIY's tutorial on this:


Today...
1. I took out the lock in the left-rear door
2. I replaced the power lock motor's heat sensor with a flattened piece of copper wire
3. I re-assembled the lock just enough to test it on the car
4. I plugged the power lock assembly into the plugs on the left-rear door. (Imagine the lock just dangling by its wires from the door. Seems secure enough...)
5. I clicked the "lock" button on my key fob. Hilariously, I didn't secure the lock together well enough, and the motor and gears went flying out of the lock and onto the floor.
6. I put it back together again, plugged it into the left-rear door, and pressed "lock" and "unlock" on the key fob The other doors try to lock and unlock. The left rear door... NOTHING. WHAT?!

I can't find anything obvious that's wrong. If the motor had circuitboards in it, I'd wonder if I had shorted them out. But it's a stupid simple electric motor consisting of a coil of copper wire and a bearing. I can't figure out why it's not working.

Disclaimer: Sorry if this post makes no sense. I've been messing around with this for 6 hours, I seem to have made it worse than when I started, and I'm getting grumpy...
Current: 2018 VW Golf 1.8T Manual
Previous: 1998 V70 T5 Manual, Subaru BRZ, Mini, Miata, etc.

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v-45magna
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v-45magna

Re: 98 V70 Door lock: Doesn't work after replacing heat sensor with copper wire

Post by v-45magna » Sun Apr 17, 2016 9:49 pm

Is it possible that the contacts inside were bent or broken? Earlier, I had ordered some motors off of ebay and received them before I realized the one's I ordered had the shaft coming from the wrong side of the motor. But I was able use one for parts to replace the contacts/brushes in one of my motors where I had knackered it up inside. I had to go back into the motor, but the parts fit it like a glove and fixed me right up. I'm sure it's the best motor of the four I have in the car now.

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RobertDIY to the rescue

Post by 1337 » Sun Apr 17, 2016 9:49 pm

RobertDIY has an extra door lock motor that he is going to send to me!

Robert is my hero...

Now that I have (almost) completed one door and I understand how it works, I think the other 3 will go much faster.
Current: 2018 VW Golf 1.8T Manual
Previous: 1998 V70 T5 Manual, Subaru BRZ, Mini, Miata, etc.

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rspi
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Re: 98 V70 Door lock: Doesn't work after replacing heat sensor with copper wire

Post by rspi » Sun Apr 17, 2016 10:20 pm

Last time I had that happen the latch had come apart in the door and the motor was loose from the contact pins.
'95 855 T-5R M, Panther - 22/28 mpg
'98 S70 GLT, Lil' Red 25/32 mpg
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Re: 98 V70 Door lock: Doesn't work after replacing heat sensor with copper wire

Post by 1337 » Sun Apr 17, 2016 10:39 pm

v-45magna wrote:Is it possible that the contacts inside were bent or broken? Earlier, I had ordered some motors off of ebay and received them before I realized the one's I ordered had the shaft coming from the wrong side of the motor. But I was able use one for parts to replace the contacts/brushes in one of my motors where I had knackered it up inside. I had to go back into the motor, but the parts fit it like a glove and fixed me right up. I'm sure it's the best motor of the four I have in the car now.
I inspected the motor as carefully as I could, and nothing seemed bent or out of place. But, it's certainly possible.
Current: 2018 VW Golf 1.8T Manual
Previous: 1998 V70 T5 Manual, Subaru BRZ, Mini, Miata, etc.

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