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Home > Puma (Tdci) > Immobiliser woes? Engine won't start - What should I check?
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andydef90



Member Since: 09 Feb 2015
Location: yorkshire
Posts: 617
United Kingdom 2014 Defender 90 Puma 2.2 HT Corris Grey
when you disconnected the battery did you just disconnect it or go through the recommended procedure . if you just disconnected it I'm led to believe this can cause issues . key coding could be one of them
Post #825931 17th Apr 2020 7:07am
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Chopperone



Member Since: 13 Nov 2016
Location: Derbyshire
Posts: 396
United Kingdom 
So what is the recommended procedure for disconnecting the battery?
Surely anyone who has a battery switch is disconnecting the battery every time they turn the switch off...........
AND if you don’t follow the recommend procedure what should you do when reconnecting the battery ?

Guy
/ May your life be like toilet paper ; long & useful.
Post #825932 17th Apr 2020 7:41am
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LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11327
United Kingdom 
The only recommended procedure is to disconnect it within 30 seconds of turning the ignition off (easy if you loosen the earth connection first). This prevents the BBUS alarm activating. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia
Post #825942 17th Apr 2020 8:25am
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17867
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
Apart from setting off the BBUS if one is fitted, disconnecting the battery spontaneously should not cause any problems. If it did, any time the battery went flat would mess up the immobiliser.

Clearly in some cases it has caused problems, but this may be due to other underlying faults.

Whilst there are obvious attractions to having a battery isolation switch, for example being able to disconnect the battery instantly after an accident to reduce the fire risk, on any modern vehicle the routine use of such a switch is likely to be problematic since it will inevitably disable the alarm, cause radio (and potentially other system) settings to be lost, inhibit wireless software updates, and so on.
Post #825944 17th Apr 2020 8:48am
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CharlieDonuts



Member Since: 16 Jun 2019
Location: Illiers Combray
Posts: 133
France 2008 Defender 90 Puma 2.4 SW Galway Green
How do I know if I have a BBUS ?

( oh yeah don't answer that) Rolling Eyes

Last edited by CharlieDonuts on 18th Apr 2020 9:43pm. Edited 1 time in total
Post #826279 18th Apr 2020 8:45pm
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LandRoverAnorak



Member Since: 17 Jul 2011
Location: Surrey
Posts: 11327
United Kingdom 
I believe that all Puma models have them but the easiest way is to disconnect the battery without following the procedure above and listen for it. It's unmistakable. Darren

110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak

"You came in that thing? You're braver than I thought!" - Princess Leia
Post #826282 18th Apr 2020 9:05pm
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