Hi all. 2007 Fabia Mk1. 4 door. Car has started locking itself after I have unlocked it with the fob. It is not the usual 30 second lock if no doors are opened. I can unlock, then open the drivers door. Interior lights come on and puddle light in door. Then the locks try and lock again. When it does lock, it doesn't light the driver's door LED. So it the same effect as if you press the lock/unlock button on the drivers door.

Happens when engine is running and when not. I had the VCDS on it and it came back with the following fault:

Address 09: Cent Elect.

...

Fault Found:

01598 - Drive Battery voltage

07-10 - Signal too low - Intermittent

Searching the forums has led me to a ground wire on the battery negative. Some people say this is a sensing wire for the convenience unit. Wire looks in good condition. Others say battery voltage may be too low. Get over 14V when running.

Any ideas before I start looking for broken wires in the doors?

Does the door open light come on when opening each door. It might be a failed door switch. My old Seat used to try and lock doors continuosly when driving and it was a problem with the circuit board in drivers door lock.

Alasdair

6 hours ago, Alasdair1 said:

Does the door open light come on when opening each door. It might be a failed door switch. My old Seat used to try and lock doors continuosly when driving and it was a problem with the circuit board in drivers door lock.

Alasdair

Yes. I think it does for all 4 doors

On 02/02/2026 at 20:26, modmytop said:

01598 - Drive Battery voltage

07-10 - Signal too low - Intermittent

Could be a bad earth somewhere. Check the continuity of the thin wire that I think goes from neg battery terminal to ECU. It may be broken internally. Also check the thin wire that goes to alternator as well. I assume your battery is reading at least 12.5 volts with engine off and check any earths that you can find.

Found this for the MK1 earth locations there may be more?

• behind battery, on strut tower

• below battery, on side member

• under centre console, in front of gearstick

• at base of LH 'C' pillar

On 03/02/2026 at 13:06, Alasdair1 said:

Does the door open light come on when opening each door. It might be a failed door switch. My old Seat used to try and lock doors continuosly when driving and it was a problem with the circuit board in drivers door lock.

Alasdair

I tried again last night, but this time I waited for the interior lights to go out after each door was opened/closed. Found the front passenger door doesn't operate the interior or puddle lights when opened. All other doors, including the boot do. So I will check the wires in the front passenger door and if OK, I guess its the door lock microswitch?

Microswitch or cracked joints on the lock module circuit board.

Have you seen my photo and video of this?

5 minutes ago, Breezy_Pete said:

Microswitch or cracked joints on the lock module circuit board.

Have you seen my photo and video of this?

Hi Pete. Yes I've seen the videos. Just waiting for a break in the weather to attack the passenger door. Had the driver's door apart recently to fit one of your fixed window control modules. Windows still operating OK.