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remote locking not working #1648097
22/01/2021 17:08
22/01/2021 17:08
Joined: Sep 2010
Posts: 270
The Netherlands
J
jaaps2 Online sick OP
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jaaps2  Online Sick OP
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Making a profit
J

Joined: Sep 2010
Posts: 270
The Netherlands
I recently bought a 20VT plus from 1999. The central locking via keys works. It also includes the option for remote (un)locking of the doors, which has not been used in a long time probably.

I changed the batteries of the remote controls. Though still none of the two work. I hear nothing in the car when pressing the button on the remote control. I disconnected the wires on the yellow box, refitted and retried => still nothing.
There is 12V power going to the yellow box.

Any tips for trouble shooting?

Attached Files
IMG_3436.jpg (74 downloads)
IMG_3438.jpg (75 downloads)
IMG_3439.jpg (75 downloads)
IMG_3440.jpg (72 downloads)

20VT, build in 1997, first used in 1998
https://youtu.be/mI0jZIIBc2w
20VT6 plus, build in 1999
Re: remote locking not working [Re: jaaps2] #1648103
22/01/2021 21:31
22/01/2021 21:31
Joined: Dec 2005
Posts: 7,591
Lightwater, Surrey, UK
DaveG Offline
Club Member 311
DaveG  Offline
Club Member 311
Je suis un Coupé

Joined: Dec 2005
Posts: 7,591
Lightwater, Surrey, UK
In the UK we never received any factory fitted alarms like your M20 yellow box, perhaps because they didn't meet (or were never tested against) the requirements of the Thatcham testing category 1 for alarms that the UK insurance industry expect. On the UK we got either the Scorpion 918U (upgrade, from the Thatcham category 2 standard Fiat CODE immobiliser to a category 1 alarm) or Meta M99 (or M99/T2) which were fitted AFAIK at point of import to the UK. For us, a "yellow box" means the CODE immobiliser box...

Do either of the remotes have an LED to indicate anything is happening when you press the button? Is there a switch or anything on the remotes? If your yellow box is supposed to connect to the central locking can you trace the wiring back to the control box (under the driver's seat?) and see if there's a break in the wiring?


1996 Portofino 20vt & 2000 Pearl White Plus
1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
Re: remote locking not working [Re: jaaps2] #1648111
23/01/2021 09:18
23/01/2021 09:18
Joined: Sep 2010
Posts: 270
The Netherlands
J
jaaps2 Online sick OP
Club Member 1560
jaaps2  Online Sick OP
Club Member 1560
Making a profit
J

Joined: Sep 2010
Posts: 270
The Netherlands
No led on the remotes. There is a push button and i pushed it directly without the casing. It’s not an alarm, just a remote control. No visible brake in the wiring on first sight but i will have a closer look and do some measuring of the part i can disconnect.


20VT, build in 1997, first used in 1998
https://youtu.be/mI0jZIIBc2w
20VT6 plus, build in 1999
Re: remote locking not working [Re: jaaps2] #1648114
23/01/2021 11:28
23/01/2021 11:28
Joined: Dec 2005
Posts: 7,591
Lightwater, Surrey, UK
DaveG Offline
Club Member 311
DaveG  Offline
Club Member 311
Je suis un Coupé

Joined: Dec 2005
Posts: 7,591
Lightwater, Surrey, UK
Ah, so you just have that M20 remote locking box, also under the seat, and no alarm?

Maybe the guys at Abacus Alarms could help you?

https://www.abacuscaralarms.co.uk/accessories-spares-2/central-locking/meta-plug-play.html

Also, since it is a factory fitted unit, there may be something in the handbook or workshop manual?


1996 Portofino 20vt & 2000 Pearl White Plus
1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
Re: remote locking not working [Re: jaaps2] #1648123
23/01/2021 16:31
23/01/2021 16:31
Joined: Sep 2010
Posts: 270
The Netherlands
J
jaaps2 Online sick OP
Club Member 1560
jaaps2  Online Sick OP
Club Member 1560
Making a profit
J

Joined: Sep 2010
Posts: 270
The Netherlands
I found nothing in the manual which helps so far. Next step can be to trace all the pins with the wiring diagram. Though the real life situation seems to contract the wiring diagram at first glance.
I opened the yellow unit, visually it all seems fine. Unfortunately no relais or led which indicates if it receives information.

The yellow unit is a meta s4416 ls/a

Attached Files
inside IMG_3477.jpg (44 downloads)
Last edited by jaaps2; 23/01/2021 16:32.

20VT, build in 1997, first used in 1998
https://youtu.be/mI0jZIIBc2w
20VT6 plus, build in 1999
Re: remote locking not working [Re: jaaps2] #1648127
23/01/2021 18:44
23/01/2021 18:44
Joined: Dec 2005
Posts: 7,591
Lightwater, Surrey, UK
DaveG Offline
Club Member 311
DaveG  Offline
Club Member 311
Je suis un Coupé

Joined: Dec 2005
Posts: 7,591
Lightwater, Surrey, UK
Is that a CR2032 or similar battery inside the yellow box? Have you changed that? (Although I'm not sure why it would need one)

Do you know for sure if the keys and yellow box were ever working together in the past?

Have you checked that the yellow box is getting an earth connection too?


1996 Portofino 20vt & 2000 Pearl White Plus
1985½ & 2016 2017 Fiat 124 Spider + XF Sportbrake
Re: remote locking not working [Re: jaaps2] #1648134
23/01/2021 20:54
23/01/2021 20:54
Joined: Sep 2010
Posts: 270
The Netherlands
J
jaaps2 Online sick OP
Club Member 1560
jaaps2  Online Sick OP
Club Member 1560
Making a profit
J

Joined: Sep 2010
Posts: 270
The Netherlands
Sorry for causing confusement. The small part with the batteries is the inside of the fob, and these are new. I checked the voltage to be sure.

The yellow box has continuous 12v from the coupe battery. I don't see any batteries inside the yellow box.

Last edited by jaaps2; 24/01/2021 16:47.

20VT, build in 1997, first used in 1998
https://youtu.be/mI0jZIIBc2w
20VT6 plus, build in 1999
Re: remote locking not working [Re: jaaps2] #1648403
30/01/2021 17:11
30/01/2021 17:11
Joined: Sep 2010
Posts: 270
The Netherlands
J
jaaps2 Online sick OP
Club Member 1560
jaaps2  Online Sick OP
Club Member 1560
Making a profit
J

Joined: Sep 2010
Posts: 270
The Netherlands
I gave up for know, i can do without the remote locking


20VT, build in 1997, first used in 1998
https://youtu.be/mI0jZIIBc2w
20VT6 plus, build in 1999

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