Key fob not working

Redmaestro · 8th October 2020, 08:56

Hi All,

I'm having a problem with my key fob. I've had the car 6yrs with no problems with the fob. I'm not sure if I have replaced the fob battery in the past but suddenly last night the remote locking stopped working. Car can lock/unlock from inside and outside by the key with no problem.

* I've changed the battery this morning to rule out low/dead battery. Fob led still lights up when lock/unlock button is pressed.
* Checked fuse (F14), not blown
* All other electrics are fine (radio, all windows, mirrors, lights)
* No other symptoms noticed

Can anyone suggest what to do next?

Thanks!

Arctic · 8th October 2020, 09:13

Quote:

Originally Posted by Redmaestro

Hi All,

I'm having a problem with my key fob. I've had the car 6yrs with no problems with the fob. I'm not sure if I have replaced the fob battery in the past but suddenly last night the remote locking stopped working. Car can lock/unlock from inside and outside by the key with no problem.

* I've changed the battery this morning to rule out low/dead battery. Fob led still lights up when lock/unlock button is pressed.
* Checked fuse (F14), not blown
* All other electrics are fine (radio, all windows, mirrors, lights)
* No other symptoms noticed

Can anyone suggest what to do next?

Thanks!

HI Simon
Ha
https://the75andztclub.co.uk/forum/s...d.php?t=308428

Redmaestro · 8th October 2020, 10:56

No luck!

I tried disconnecting the battery for 30mins, this 'Norwegian' method whilst the battery was disconnected and checked the bcu fuses mentioned in the Haynes manual before reconnecting. Is there anything else to try?

VVC-Geeza · 8th October 2020, 11:18

Try it in a different location.

Redmaestro · 8th October 2020, 18:32

Quote:

Originally Posted by VVC-Geeza

Try it in a different location.

Still no luck - I tried it when I picked the kids up from school, about 4miles from my house. Nothing!!

Its starting to annoy me now!

VVC-Geeza · 9th October 2020, 10:47

Fortunately I was able to resolve my issue as per the link above.It was suggested that a T4 session should be the next step if it had persisted elsewhere.

clf · 9th October 2020, 11:05

There is a second fuse for the bcu which also.covers the battery back.up siren.

I cannot recall the number of it, but perhaps 42, or 46. In desperation I removed all the fuses one by one to check them.

My symptoms were not locking or unlocking with the remote. Resetting by disconnecting the car battery worked initially and then reverted once the car had started. Once the fuse was replaced, all was good.

If you try this, and it works for you, check if you have a battery back up siren instead of the standard alarm.horn (if you have factory fitted xenons you will have the bbus). If you do have a bbus, and the fuse fixed the issue, check if your alarm operates (if not, replace with a bini or bmw siren ) .

I am convinced that the failure of this due to.corrosion lead to the fuse blowing in my car.

Sent from my SM-A600FN using Tapatalk

8th October 2020, 08:56	#1
Redmaestro Avid contributor Join Date: Mar 2014 Posts: 106 Thanks: 11 Thanked 4 Times in 4 Posts	Key fob not working Hi All, I'm having a problem with my key fob. I've had the car 6yrs with no problems with the fob. I'm not sure if I have replaced the fob battery in the past but suddenly last night the remote locking stopped working. Car can lock/unlock from inside and outside by the key with no problem. * I've changed the battery this morning to rule out low/dead battery. Fob led still lights up when lock/unlock button is pressed. * Checked fuse (F14), not blown * All other electrics are fine (radio, all windows, mirrors, lights) * No other symptoms noticed Can anyone suggest what to do next? Thanks!

8th October 2020, 11:18	#4
VVC-Geeza This is my second home 2005 Connoisseur SE 1.8 Turbo,2004 45 1.8 Connoisseur and my beloved 1998 VVC Coupe. Join Date: Nov 2009 Location: Derby. Posts: 8,756 Thanks: 2,022 Thanked 1,016 Times in 739 Posts	Try it in a different location. __________________

9th October 2020, 10:47	#6
VVC-Geeza This is my second home 2005 Connoisseur SE 1.8 Turbo,2004 45 1.8 Connoisseur and my beloved 1998 VVC Coupe. Join Date: Nov 2009 Location: Derby. Posts: 8,756 Thanks: 2,022 Thanked 1,016 Times in 739 Posts	Fortunately I was able to resolve my issue as per the link above.It was suggested that a T4 session should be the next step if it had persisted elsewhere. __________________

9th October 2020, 11:05	#7
clf This is my second home MG ZT CDTi Join Date: Jan 2014 Location: carrick Posts: 7,859 Thanks: 3,494 Thanked 2,657 Times in 1,973 Posts	There is a second fuse for the bcu which also.covers the battery back.up siren. I cannot recall the number of it, but perhaps 42, or 46. In desperation I removed all the fuses one by one to check them. My symptoms were not locking or unlocking with the remote. Resetting by disconnecting the car battery worked initially and then reverted once the car had started. Once the fuse was replaced, all was good. If you try this, and it works for you, check if you have a battery back up siren instead of the standard alarm.horn (if you have factory fitted xenons you will have the bbus). If you do have a bbus, and the fuse fixed the issue, check if your alarm operates (if not, replace with a bini or bmw siren ) . I am convinced that the failure of this due to.corrosion lead to the fuse blowing in my car. Sent from my SM-A600FN using Tapatalk __________________ It is not gloss primer .............. it is duct tape silver!

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8th October 2020, 10:56	#3
Redmaestro Avid contributor Join Date: Mar 2014 Posts: 106 Thanks: 11 Thanked 4 Times in 4 Posts	No luck! I tried disconnecting the battery for 30mins, this 'Norwegian' method whilst the battery was disconnected and checked the bcu fuses mentioned in the Haynes manual before reconnecting. Is there anything else to try?