Problems with 964 central locking
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Joined: Nov 2013
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Problems with 964 central locking
Hi my name is Simon I'm new on this forum and hoping some one can help me out here. I've got a 91 964 and I'm having problems with the doors not locking from the key or the lock button inside. I've replaced the main Ecu under the drivers seat and checked the micro switches on the locks. Is there any thing else I should look for. Sorry about all the questions in my first post but this thing is starting to get the better of me and any info would be great fully appreciated thanks in advance
Rennlist Member
Joined: Apr 2004
Posts: 2,570
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From: Oslo, Norway
The Motronic engine control unit is placed under the driver's seat, this is not involved in the door lock operation.
Do you have the 993-type of lcok/alarm control unit? This is a metal unit placed under the passenger seat, equipped with a yellow and a black connector. This has a fuse inserted between the connectors, you could check if this is OK.
Early 964 models have a more simple lock control unit placed in under the dashboard in the passenger foot well. Maybe the connentor has been kicked out of the socket?
Cheers,
Tore
Do you have the 993-type of lcok/alarm control unit? This is a metal unit placed under the passenger seat, equipped with a yellow and a black connector. This has a fuse inserted between the connectors, you could check if this is OK.
Early 964 models have a more simple lock control unit placed in under the dashboard in the passenger foot well. Maybe the connentor has been kicked out of the socket?
Cheers,
Tore
Instructor
Joined: Mar 2009
Posts: 224
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From: Hertfordshire, UK
The actuators are not operating at all? Sounds fundamental.
A more common issue is the actuator works but the lock does not. This is often down to a broken pushrod in the locking mechanism (plastic ball and socket joint where the socket is broken) - easily checked by taking the door card off.
Since there are several ways to lock and unlock doors it might be worth updating us on whether any of the following cause an actuator (either door) to work:
1. Remote keyfob type alarm / central locking
2. Key in the drivers door - I THINK this should operate both doors (someone will correct me if I'm wrong)
3. The central locking button on the centre console
If none of these operate an actuator in the door then you have a fundamental issue UNLESS the car is new to you and has done this since you got it in which case you could have 2 x actuator failure but with no history you would not recognise this double fault.
Best of luck.
A more common issue is the actuator works but the lock does not. This is often down to a broken pushrod in the locking mechanism (plastic ball and socket joint where the socket is broken) - easily checked by taking the door card off.
Since there are several ways to lock and unlock doors it might be worth updating us on whether any of the following cause an actuator (either door) to work:
1. Remote keyfob type alarm / central locking
2. Key in the drivers door - I THINK this should operate both doors (someone will correct me if I'm wrong)
3. The central locking button on the centre console
If none of these operate an actuator in the door then you have a fundamental issue UNLESS the car is new to you and has done this since you got it in which case you could have 2 x actuator failure but with no history you would not recognise this double fault.
Best of luck.
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Nordschleife Master
Joined: Feb 2007
Posts: 5,095
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From: Cheshire, UK
Mine partially failed so that only one door would lock. Replaced it with a used one (off a 944) to fix it. They're about £350 for a new one.
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Thread Starter
AutoX
Joined: Nov 2013
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Thanks I can see that grey box under the dash is it likely to be that one gone. The actuators are moving freely in and out and all linkages are fine no stiffness or broken/bent rods. It's been like this since I got it. When I turn the key in both doors the Ecu clicks but nothing else can any one tell me which connections I should get signal to on the actuators when triggered by the key maybe then I could test the actuators manually with a 12v supply
Three Wheelin'
Joined: May 2009
Posts: 1,280
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From: Bucks, Herts, Beds Tri-Border, UK
Any luck Simon? Been watching with interest as I have the same issue but not got round to that to-do list yet. However, hasn't bothered me too much if I can still set the alarm and imobiliser. Would be to find out if you sorted it...
Nordschleife Master
Joined: Feb 2007
Posts: 5,095
Likes: 4
From: Cheshire, UK
Simon and Marcus, the information in my own old thread about central locking problems might be useful to you:
https://rennlist.com/forums/964-foru...g-problem.html
https://rennlist.com/forums/964-foru...g-problem.html