I have a 2015MY D4 and recently had some battery grumbles and replaced the battery but i subsequently saw this suggesting a secondary battery is present.
should i be replacing that one as well?
thanksD4 HSE
L322 gone
5th Mar 2018 5:14 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72785
Yes if you have stop/start. Or if someone's fitted an aux battery.
5th Mar 2018 5:18 pm
Knotty
Member Since: 21 Jan 2014
Location: UK
Posts: 9
Thanks DSL.
My issues relate to the smart key. Recently it hasn't been "seen" (smart key not found) by the car and so i haven't been able to open the car and have had to resort to the physical key and holding the fob on the steering column to sort the alarm.. after which the car finds the key and off i go.
so with the cold weather and prior experience of L322 issues when the battery is past it's best i changed the battery which for a day cured all issues. However on the second day post battery replacement the gremlins returned.
had to unlock with the physical key etc
will replacing the second battery for the start/stop (which i always turn off) help, or do you think this is a LR software issue??
by the way fob battery is fine and replaced that just to be sure....
many thanksD4 HSE
L322 gone
5th Mar 2018 7:26 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72785
Afraid way past my techie knowledge. Someone far more knowledgable should be along.
5th Mar 2018 7:30 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8084
The secondary keeps the system electrics alive while the main battery is used for the heavy work like supplying the starter motor and othe power hungry components, the second battery is only miniature by comparison and is relatively cheap, try leaving it on charge overnight!It can when others can't,
It will when others won't,
It goes where others don't.
Sounds like a fob issue to me... Battery may be new but is it making good contact? Key is still paired with the car so I'd be surprised if charging secondary battery sorts this..
Dean
====================================
2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms
Possibly a transponder issue, (in the car), just had mine replaced under warranty, wasn't recognising key even 2m distant.Paul.
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5th Mar 2018 9:23 pm
Dudleydisco
Member Since: 20 Jun 2014
Location: York
Posts: 853
The secondary battery is only used when the engine is stopped during a stop/start cycle. As M3DPO says, it keeps some systems alive when the engine is stopped. Trying changing the battery in your keyfob, and if tha doesn't work, there was a TSB out for the 'Smart key not found' message on the IPC. D4 MY14 XXV - RLD/IID BT
D4 MY13 HSE Lux - RLD/IID BT
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... All LED interiors lights, DRLs, Spare Wheel protector.
