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Central Locking

neilhazel3

neilhazel3

New member
Hi, My central locking is not working on my 2001 996 C4, I can lock it manually with key but I get a single horn beep. Have changed the battery in the key but not sure if I have to re-set it.

Can anyone advise what to check.
 
Hi Neil

A single beep from the alarm horn usually points to something not shut correctly, either the glove box on a Mk2, oddments tray in the centre console, door open, fuel cap, luggage compartment or engine compartment being left open or one of there switches has a fault. A Porsche tester will be able to find the culprit but The following links may help you find the issue.

Good luck

Andy

https://www.porscheclubgb.com/forum/tm.aspx?m=570901

https://www.porscheclubgb.com/forum/tm.aspx?m=685707&high=central+locking

 
When you lock the driver's side with the key, does the passenger side actually lock? If it doesn't, then it is probably the fuse for the central locking, which is located between the two connectors on the alarm unit, located under the passenger seat.

 
Richard_Hamilton said:
When you lock the driver's side with the key, does the passenger side actually lock? If it doesn't, then it is probably the fuse for the central locking, which is located between the two connectors on the alarm unit, located under the passenger seat.

Hi Richard, Thanks for this info, do i need to remove the seat to access the alarm unit? Have had a look and there is also a two pin conecter brown wires not plugged in to anything, should it be?
Click to expand...
 
If you move the seat all the way forward, and adjust it as high as possible, you should be able to reach the fuse from the rear footwell. The two-wire connector is probably the one for the seat belt deactivation kit (for the child's seat). It is usually taped to the underside of the seat, but they often fall down.

 
Hi Richard,

Finally managed to get to the fuse, had to remove the seat but got there. The 15 amp fuse is fine it had not blown, anything further I can check?

Regards

Neil

 
Any sign of dampness around the alarm module? When you lock the car with the key in the door, do you do it with a single turn of the key? Does it lock the passenger side when you lock the driver's side?

 
Hi Richard, No dampness around the unit, when I put the key in the drivers door I turn it to the left once and it make a single beep. The passenger side does not lock.

Regards

Neil

 
That's exactly the symptoms of a blown fuse on the alarm module, so I'm surprised you found it to be intact. That fuse powers the central locking part of the alarm module. The rest of the system must be working, otherwise you wouldn't be able to start the car. (The immobiliser wouldn't be working). You could double-check the fuse, but apart from a bad connection on one of the plugs, I can only think it must be an internal fault with the alarm module.

 
Richard_Hamilton said:
That's exactly the symptoms of a blown fuse on the alarm module, so I'm surprised you found it to be intact. That fuse powers the central locking part of the alarm module. The rest of the system must be working, otherwise you wouldn't be able to start the car. (The immobiliser wouldn't be working). You could double-check the fuse, but apart from a bad connection on one of the plugs, I can only think it must be an internal fault with the alarm module.
Click to expand...
Hi, I have replaced the fuse and checked that the connectors are pushed in but still no luck. Will have to get the alarm module checked out.

Thanks for your much needed help.

Regards

 
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