Power Door Lock Problem

[Maymybonneliveforevr]

Car:
97 Bonneville Ei

Problem:
When ever I press the power door lock switch the door locks only engage approximately 30% and don't lock or unlock. It's the same whether I press the drivers or passenger door lock switch and the further away from the drivers door the weaker the locks function and sounds. It almost reacts as though I'm getting around 10 volts to the door lock solenoid. They work manually so all four locks are not stuck and the alternator is charging between 13.0-13.3 volts at idle. If I press either door lock switch rapidly twice, they tend to engage at around 80%, but only 60% of the time.

The key fob stopped working so I can't try that function. Any suggestions as to the problem?

Thanks

[RPACODY]

maybe a bad relay - some are under the drivers seat

[Maymybonneliveforevr]

Thanks for the reply rpacody,

I'll see if I can find the relay and swap it out, I would figure it was more of a bad connection or ground since it seems to be lacking power.

[sonoma_zr2]

If you suspect a wet floor, your ground buss connections under both door sills could be the problem. They are located near the front of each door opening. Search for "ground buss", there are lots of pics posted.

[Maymybonneliveforevr]

Thanks for the reply Sonoma_r2

I gather you're refering to the photo below which I found while doing the search? By the way, no wet floor but it's still worth looking into.

[Maymybonneliveforevr]

I checked the ground buss and there doesn't seem to be any corrosion so I put it back together and the problem still exists. I've done a search and read the relay is under the drivers seat below the carpet but can't seem to locate it. I've then read it's under the passenger glove box. Anyone know which one is correct for the 97 model year?

[RPACODY]

Haven't had the problem on my 98 (yet) but think I read someplace that it is in a housing (box) that contains 2 relays under the seat but not sure

[sonoma_zr2]

box under the glove box

[Maymybonneliveforevr]

Thanks sonoma, I'll check tomorrow as Michael has the car and is at work at the moment.

[Maymybonneliveforevr]

I changed the door lock relay and found no difference. One thing I did notice is when the relay was removed, I pressed the passenger door lock switch and the drivers door lock worked great. None of the other door locks worked as the relay was out.

Any other suggestions I can try?

[SSEiMan01]

Switches possibly?

[RPACODY]

might try finger pressure on each of the lock slides in the doors one at a time while using your fob and maybe find a weak actuator

[Maymybonneliveforevr]

Switches possibly?

The problem is the same whether I use the drivers or passenger door lock switch so you think it maybe both switches?

might try finger pressure on each of the lock slides in the doors one at a time while using your fob and maybe find a weak actuator

You think one actuaator would case problems with all 4 door locks?

[RPACODY]

was just thinking it might be a way to isolate if one door was causing a problem robbing voltage (maybe a dumb idea but easy to try) – did you clean BOTH busses?

[SSEiMan01]

Could be both switches, actually. Ya never know. But I would eliminate everything else first then use the switch theory as a backup.

[Maymybonneliveforevr]

did you clean BOTH busses?

I didn't realize there were two, I only checked the drivers side, is there one on the passenger side?

Could be both switches, actually.

Well then I'll have to replace one of the switches and check.


Thanks for the suggestions guys.

[RPACODY]

there is a Buss (pic above) on driver and passenger side - bad buss could give you poor ground and low voltage clean both as common to many electrical problems

[Maymybonneliveforevr]

So far I have:

replaced both driver and passenger door lock switches
replaced the door lock relay on the passenger side under the glove box.
replaced the 20 amp fuse located near the relay.
cleaned driver and passenger side ground buss.

Problem still exists, if I press the door lock switch quickly twice in either the unlock or lock position, it seems to work 80% of the time.

[Maymybonneliveforevr]

I've fiddled around with this a bit more and can't seem to figure it out. My previous posts lists what I've tried already and I don't know what else to try.

Any suggestions please.

Thanks

[Maymybonneliveforevr]

Just a bump if anyone has any suggestions.

Thanks