The usual problem:
Central locking fault
A common fault showing up on BMW models of this era, is caused by
a fault in the GM5 module.
This controls the central locking and the power windows.
Common symptoms include:
* Failure to lock or unlock the central locking on one or more doors.
* Fuel filler affected also.
* If intermittent, worse on hot or cold weather.
Inside the GM5 (the "General Module", otherwise known as ZKE5 /
ZKE-IV) is an electronic circuit with relays that control the
central locking and power windows.
After many years of operation, the relay contacts start to burn up and eventually fail.
Usually, it is the central locking for one of the doors that will fail first, but the rear power windows do sometimes fail also, for the same reason.
BMW GM5 module, with central locking relays outlined in yellow.
Some versions have two more relays to the right of these, for the power windows.
Some versions (labelled Star12) use different relays. We don't offer a service for these.
Replacement relay, original part no V23084-C2001-A303.
Two relays are required to replace both central locking relays.
These relays are also used on the GM3, and on other modules
If you have good soldering skills, we offer replacement relays
for you to do the job yourself.
A word of warning though, it is not an easy task as the relays have 10 pins each, with each pin soldered into through-plated holes, which makes removal very difficult unless you have the skill AND the right tools.
Alternatively, why not leave the job to us, by sending your GM5 module to us to repair your central locking fault?
You can book it in here.
Note that we do not offer to repair the rear power windows, as replacing the relays is only effective in 50% of cases.
Ordering by Mail Order
Post us your faulty module - we normally repair, test and return
within 2 days.
To reduce the possibility of delays, please book in your order first by finding your product and booking on line on this site first.
Please pack in a stout cardboard box and send to
CA14 3YF UK
Enclose a copy of your online order, and ensure your phone no. and email are included.
Please state if you want the item returned if unrepairable.
Briefly describe the fault, as experienced.
If you are using Royal Mail, you can ask for a certificate of posting, guaranteeing you the goods' value up to around £30-£35 if the Post Office fails to deliver. - Post doesn't go astray often, but the certificate is a free alternative to registered or recorded delivery as a method of insurance.
You can also claim up to £10 compensation if your despatched goods are more than 4 days late: http://www.royalmail.com/compensation
Note to buyers from outside the European Union
On your customs declaration, please DO NOT give your item a value of anything above £1.
Otherwise, we will be forced to pay 25% import duty, and we will expect you to reimburse us for this!
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Guarantee to our customers
All our products carry a full 1 year guarantee.
If a fault should develop at any time over the 12 month period, simply return for a free replacement or repair.
If, for any reason, you are unhappy with your purchase on receipt, simply return within 30 days for a full refund including P&P.