s40 lock problems

CheekoS40 · Oct 11th, 2018, 16:47

Hi im hoping that someone here may be able to help. I had a driver door locked shut. had to break the lock control unit to unlock door. replaced unit witha second hand one. Now no locks, windows or any electrics at the rear of the car are working. Checked all fuses but can not seem to find a problem. plugged in diagnostic unit to see if there were any error messages but nothing. Someone please help and save me from a hefty dealership bill.

Many thanks

Welton · Oct 12th, 2018, 08:00

I'm sure I remember on here that the lock units are coded to the car, the drivers lock could be more complex as it has the facility to be unlocked on its own with the remote rather than open all the other doors at the same time, I'm guessing this means there is at least some intelligence going on between all the locks.

This could well mean that dealer only software might be needed to get it all working (assuming the second-hand unit is the correct one and even if it is that they can actually use it in your instance).

I think member iainmd has experience of this, could search his posts.

iainmd · Oct 15th, 2018, 19:29

Yes, sadly that is the case. They must be coded to the car by Volvo and they will only code brand new dealer supplied modules. I had a driver door one go and also a rear door. Each time a bill for around £300-£400 ensued. Sorry.

Oct 11th, 2018, 16:47	#1
CheekoS40 New Member Last Online: Oct 11th, 2018 17:48 Join Date: Oct 2018 Location: Aberdeen	s40 lock problems Hi im hoping that someone here may be able to help. I had a driver door locked shut. had to break the lock control unit to unlock door. replaced unit witha second hand one. Now no locks, windows or any electrics at the rear of the car are working. Checked all fuses but can not seem to find a problem. plugged in diagnostic unit to see if there were any error messages but nothing. Someone please help and save me from a hefty dealership bill. Many thanks

Oct 12th, 2018, 08:00	#2
Welton Premier Member Last Online: Sep 14th, 2021 17:03 Join Date: Feb 2009 Location: Market Harborough	I'm sure I remember on here that the lock units are coded to the car, the drivers lock could be more complex as it has the facility to be unlocked on its own with the remote rather than open all the other doors at the same time, I'm guessing this means there is at least some intelligence going on between all the locks. This could well mean that dealer only software might be needed to get it all working (assuming the second-hand unit is the correct one and even if it is that they can actually use it in your instance). I think member iainmd has experience of this, could search his posts. __________________ 2005 S40 T5 SE - Manual. Bilstein B4's. (For Sale) 2010 Citroen C4 1.6 HDi (bizarre Gearbox model). 2010 Renault Twingo (refreshingly simple) 2018 Infiniti Q30 1.6T Business Executive (what's this button do?)

Oct 15th, 2018, 19:29	#3
iainmd Member Last Online: Yesterday 12:13 Join Date: Nov 2004 Location: Fife View Photos By: iainmd	Yes, sadly that is the case. They must be coded to the car by Volvo and they will only code brand new dealer supplied modules. I had a driver door one go and also a rear door. Each time a bill for around £300-£400 ensued. Sorry. __________________ Present: 2009 Volvo V50 1.6D DRIVe SE Past: 2004 Volvo S40 T5 SE

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