Central locking via remote keyfob not working

[AC5L4T3R]

Hey all.

For the last 10 months or so I've been unable to unlock my car using the keyfob, the buttons do nothing and neither does re-registering the key. I assumed the battery had finally died after 17 years of use but never got around to getting a new key sorted until now. I went to a mobile key guy and he told me the key still had power and his key coding device was receiving a signal from the key.

I read about the GM5 unit being prone to failure, but the central locking button inside the car is working fine. I've ordered a couple of relays just in case but I can't think what else could be causing the problem. The battery in the car is from 2017 and when I did a voltage check the other day it was producing 12.4v when the car was idle.

Cheers

[kagan]

I've got the same issue with my car too. I bought a replacement battery thinking this must be the issue, opened up the key and swapped it but had no joy. If I manage to get to the bottom of it I'll post another reply, but if you work it out before me please update the thread

[Keyper]

I’ve had this issue and it was the GM5 module, however I removed mine from the car and posted it off for repair, roughly £40 if my memory serves me well, a company in Workington in Cumbria.

I found that you could still lock both doors with the key and that the boot opened from the button, however the central locking from the key was a no no

[AC5L4T3R]

The day after this post, the key started working again but has since stopped. I did the repairing button combo with the key next to the rear view mirror where the sensor is supposed to be and it paired first time. The key worked for a day or two and then became intermittent, now doesn't work at all. I did put it on a toothbrush charger and the next day it unlocked the car remotely but since then nothing. Assuming the battery is buggered.