Trouble locking car

Rogue-OP · 12-20-2016, 12:23 AM

My key fob has not been working well lately. I do not have the comfort access option. They keyfob no problem unlocking my car, but doesn't seem to want to lock. I have to push it around 3-8 times to get it to lock. I've tried it at 1ft from the car and even sitting inside of it. There is no sound when I press lock, so I don't think it would be the actuator. Oddly, if I press unlock (while it's already unlocked) and then lock it usually works right away. It's hard to call it a key fob battery issue as it unlocks fine.

The703 · 12-20-2016, 03:33 PM

Fob battery

patents · 12-21-2016, 11:42 AM

Do you have your second fob to try?

cdgatti · 12-30-2016, 06:42 AM

How old is the car battery? Any other electrical gremlins popping up? Could be time.

Turbo_power4ever · 01-06-2017, 11:42 PM

I got same issue. all doors lock with dash button. I put in 20 amp fuse in slot 57, reset battery but fob will not unlock, lock or open trunk. it will start car. no comfort access. is it time for new fob? I heard it's like 200-300$. has anyone successfully opened the fob and replaced the rechargable battery in it?

patents · 01-09-2017, 10:35 AM

Quote:

Originally Posted by Turbo_power4ever

I got same issue. all doors lock with dash button. I put in 20 amp fuse in slot 57, reset battery but fob will not unlock, lock or open trunk. it will start car. no comfort access. is it time for new fob? I heard it's like 200-300$. has anyone successfully opened the fob and replaced the rechargable battery in it?

You do not have the same issue. OP's fob will unlock the car, but will not lock. Your fob is completely dead.

Rogue-OP · 01-10-2017, 01:28 AM

No second fob. I'm gonna try a fob battery swap first as that would be the cheapest option. I wish I had a frequency scanner to test if it's actually sending out a signal when I press lock, but alas I don't have that equipment.

Rogue-OP · 01-22-2017, 06:31 PM

Update: I successfully swapped the battery on the key fob, and have the same issue (granted the battery is low on power as I haven't driven long enough to recharge it). My EE friend tested the tact switch and it seems that the middle one (lock) isn't working. I put in an order for replacement switches and will update after we get and install them.

ctuna · 01-22-2017, 06:38 PM

You can try this to charge it

any inductive charger should work.

Rogue-OP · 01-31-2017, 01:23 AM

Quote:

Originally Posted by ctuna

You can try this to charge it

any inductive charger should work.

I tried a qi phone wireless charger and that didn't recharge it, but we did wire the battery to the circuit board of our product which has a charging circuit for coin cell batteries. It's now charged.

And I've fixed it!!!
It ended up being the tact switch. I ordered this one off of Digikey: http://www.digikey.com/products/en/switches/tactile-switches/197?k=&pkeyword=&pv7=2&FV=8dc0378%2C182c0021%2Cffe 000c5%2C4080030&mnonly=0&newproducts=0&ColumnSort= 0&page=1&quantity=0&ptm=0&fid=0&pageSize=25
I replaced all three switches for longevity and with the battery replaced my range is now much better!

12-20-2016, 12:23 AM	#1
Rogue-OP Private First Class 58 Rep 192 Posts Drives: to Drum & Bass Join Date: Nov 2015 Location: West Coast iTrader: (0)	Trouble locking car My key fob has not been working well lately. I do not have the comfort access option. They keyfob no problem unlocking my car, but doesn't seem to want to lock. I have to push it around 3-8 times to get it to lock. I've tried it at 1ft from the car and even sitting inside of it. There is no sound when I press lock, so I don't think it would be the actuator. Oddly, if I press unlock (while it's already unlocked) and then lock it usually works right away. It's hard to call it a key fob battery issue as it unlocks fine.
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12-20-2016, 03:33 PM	#2
The703 Private First Class 11 Rep 177 Posts Drives: 2008 328i coupe Join Date: Feb 2014 Location: NoVA iTrader: (0)	Fob battery
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12-21-2016, 11:42 AM	#3
patents Lieutenant 164 Rep 598 Posts Drives: 2008 328i Join Date: Aug 2014 Location: Memphis, TN iTrader: (0)	Do you have your second fob to try?
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12-30-2016, 06:42 AM	#4
cdgatti Colonel 255 Rep 2,547 Posts Drives: e90 328i Join Date: May 2011 Location: KY iTrader: (4)	How old is the car battery? Any other electrical gremlins popping up? Could be time. __________________ OEM Black grill and Blackline tails - LCI halogens with Lux V2 coded as DRL - 3M Crystalline - BMS PBX - OEM Euro Airbox with K&N - Hardwired CTEK - Bilstein B6 w/OEM springs and SP perches - Conti DWS06 - HiFi-Helix DSP - JLAudio HD/XD-Morel - CD changer trim - AE optical out
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01-06-2017, 11:42 PM	#5
Turbo_power4ever Captain 93 Rep 606 Posts Drives: Fbo blacked e92 Join Date: Feb 2015 Location: Nky iTrader: (2)	I got same issue. all doors lock with dash button. I put in 20 amp fuse in slot 57, reset battery but fob will not unlock, lock or open trunk. it will start car. no comfort access. is it time for new fob? I heard it's like 200-300$. has anyone successfully opened the fob and replaced the rechargable battery in it?
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01-10-2017, 01:28 AM	#7
Rogue-OP Private First Class 58 Rep 192 Posts Drives: to Drum & Bass Join Date: Nov 2015 Location: West Coast iTrader: (0)	No second fob. I'm gonna try a fob battery swap first as that would be the cheapest option. I wish I had a frequency scanner to test if it's actually sending out a signal when I press lock, but alas I don't have that equipment.
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01-22-2017, 06:31 PM	#8
Rogue-OP Private First Class 58 Rep 192 Posts Drives: to Drum & Bass Join Date: Nov 2015 Location: West Coast iTrader: (0)	Update: I successfully swapped the battery on the key fob, and have the same issue (granted the battery is low on power as I haven't driven long enough to recharge it). My EE friend tested the tact switch and it seems that the middle one (lock) isn't working. I put in an order for replacement switches and will update after we get and install them.
	Appreciate 0 Quote

01-22-2017, 06:38 PM	#9
ctuna Lieutenant General 1911 Rep 13,103 Posts Drives: 325xi 06 wagon MT Join Date: Jan 2010 Location: Santa Cruz, Ca iTrader: (0)	You can try this to charge it any inductive charger should work.
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