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Central locking #755644
January 10th 2020 10:39 am
January 10th 2020 10:39 am
Joined: Nov 2019
Posts: 12
France, Toulouse
F
frediz Online content OP
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frediz  Online Content OP
stranger
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Joined: Nov 2019
Posts: 12
France, Toulouse
Hey,

since I bought my 87 GMC G2500, I'm unable to use central locking.
I changed the remote control battery with a new one but it didn't help.
The remote control circuit looked ok at first when I had a look a few months ago (need to check again).
Do you have any idea of what could be wrong ?
Is there a central locking relay somewhere ?

Thanks!

Best wishes for 2020, health first cheers

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Re: Central locking [Re: frediz] #755691
January 11th 2020 9:37 pm
January 11th 2020 9:37 pm
Joined: Jan 2014
Posts: 740
Staunton, VA
kursed Offline
old hand
kursed  Offline
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Joined: Jan 2014
Posts: 740
Staunton, VA
I'm not even sure what "central locking" is. Do you mean the key fob lock, or the lock switch on the doors?


[Linked Image]
Re: Central locking [Re: frediz] #755733
January 12th 2020 4:28 pm
January 12th 2020 4:28 pm
Joined: Nov 2019
Posts: 12
France, Toulouse
F
frediz Online content OP
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frediz  Online Content OP
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Joined: Nov 2019
Posts: 12
France, Toulouse
Hey Kursed,
by central locking, I meant the key fob lock.
Is there a way to determine if the key fob is dead/faulty or if it's the "receiving" part ?
I thought of trying to pair the key fob with the van again, but I don't even know how to do that.

Re: Central locking [Re: frediz] #755736
January 12th 2020 5:13 pm
January 12th 2020 5:13 pm
Joined: Jun 2010
Posts: 14,619
Van Diego California
frscke1 Offline
frscke1  Offline

Joined: Jun 2010
Posts: 14,619
Van Diego California
What brand is the alarm & fob.....


SUNSHINE VANS-VAN DIEGO
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ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: Central locking [Re: frediz] #755739
January 12th 2020 7:53 pm
January 12th 2020 7:53 pm
Joined: Jan 2001
Posts: 2,314
East Brady, PA
M
Meanmachine Online content
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Meanmachine  Online Content
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Joined: Jan 2001
Posts: 2,314
East Brady, PA
Did 87 have a factory remote opening system? Could this be aftermarket add-on. I had a 1989 Blazer that still had to be opened with the key.

Re: Central locking [Re: Meanmachine] #755753
January 13th 2020 4:16 am
January 13th 2020 4:16 am
Joined: Nov 2019
Posts: 12
France, Toulouse
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frediz Online content OP
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frediz  Online Content OP
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Joined: Nov 2019
Posts: 12
France, Toulouse
Originally Posted by frscke1
What brand is the alarm & fob.....


I'll sent a picture of the fob back home.

Originally Posted by Meanmachine
Did 87 have a factory remote opening system? Could this be aftermarket add-on. I had a 1989 Blazer that still had to be opened with the key.


That's a good point.. I wondered too. 87 seems early to me, but that's my first van.


I think I'd need to dig a bit to find the locking system.
Maybe near the fuse box or in some other place : I read that conversion vans may have a 2nd fuse box...

Re: Central locking [Re: frediz] #755760
January 13th 2020 7:20 am
January 13th 2020 7:20 am
Joined: Jan 2014
Posts: 740
Staunton, VA
kursed Offline
old hand
kursed  Offline
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Joined: Jan 2014
Posts: 740
Staunton, VA
What I've found on most of them that were inoperable, both factory and aftermarket, were they needed to be cleaned really well. Take the fob apart and use some isopropyl alcohol on a Q-tip to clean the contact points on the main board. You can clean under the rubber contacts really well also. They usually get a bit of black goo on the contact point of the board which causes the contact to go wonky.

This guy on YouTube has a great tutorial on doing this.

Cleaning a Key Fob


[Linked Image]
Re: Central locking [Re: frediz] #755796
January 14th 2020 10:47 am
January 14th 2020 10:47 am
Joined: Nov 2019
Posts: 12
France, Toulouse
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frediz Online content OP
stranger
frediz  Online Content OP
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Joined: Nov 2019
Posts: 12
France, Toulouse
Thanks for the suggestion Kursed.
I've begun cleaning the keyfob PCB with isopropyl alcohol this morning but the button contacts are done by components soldered on the board.
So maybe those are dead, because after cleaning I tried the fob and it didn't work.
I'll try desoldering them and/or shortcircuit to test further.
In the meantime, here is the picture of the keyfob itself (I didn't have time to take a picture of main board)
Inside the shell, there a small label, not sure if it's a date...

Attached Files IMG_20200114_101412.jpgIMG_20200114_101704.jpgIMG_20200114_164256.jpg
Re: Central locking [Re: frediz] #755797
January 14th 2020 11:25 am
January 14th 2020 11:25 am
Joined: Jan 2001
Posts: 2,314
East Brady, PA
M
Meanmachine Online content
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Meanmachine  Online Content
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M
Joined: Jan 2001
Posts: 2,314
East Brady, PA
If 12-4-96 is the date, that would lead me to think this is an aftermarket system. Also, I have 3 newer Chevy's 1999 and up, and all my key fobs have the GM logo stamped in the backside of the case. GM stamps most of their products so you know that they are factory OEM.

Re: Central locking [Re: frediz] #755808
January 14th 2020 3:57 pm
January 14th 2020 3:57 pm
Joined: Nov 2019
Posts: 12
France, Toulouse
F
frediz Online content OP
stranger
frediz  Online Content OP
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Joined: Nov 2019
Posts: 12
France, Toulouse
Yeah, no GM stamp on the back, only the GM sticker on the buttons side.
I tested the 2 switches with a continuity tester and they work. So the problem is somewhere else.
I had a look with a magnifier and I'm wondering if some SMD is not missing.
Will take a picture to show and have your thoughts.

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