It looks clear to me from SS+298 and the circuit diagrams in it that the rear battery is dedicated for starting purposes (but it depends on some prior tests by the car). If voltage is <11.5V - then the starter battery is deemed discharged and then the Onboard Power supply battery becomes the battery providing power to start (as well as everything else - glow pugs, radio, whatever is on).
The three images below show the 3 possible scenarios when an engine start is required.
That diagram only shows a constant, direct connection to the under-seat battery. the only time it is disconnected from the starter motor is after a collision where the isolation relay has been triggered.
Yes all diagrams show the rear battery also connected, but it is also the only one with potential for disconnection.
I had a under seat battery that was discharging its self and to start the car i had to turn the key to the left and bring in the rear battery. after replacing the front under seat battery no more problems in the past 12 months
SSP298 states the parallel relay is disconnected until entry and start authorization module powers the relay.
Perhaps the left key turn bypasses the authorization module to activate the parallel relay itself, but would only occur if there was enough power in the on-board battery to do it.
Fairly certain left key turn doesn't work if on-board battery is disconnected. (or fully discharged)
Can anyone enlighten me on how to get to the front parking camera on a 2012 T3? Mine has been hit and the lens is broken, not keen on spending the $600 (yep $600, part only!) quoted by the dealer for a replacement camera so want to get it out and see if I can get similar one at a sane...
Thanks to another forum, please give THEM an applause.
Should not need any activation. I did some firmware mods afterwards, and then I needed to reactivate. Used activation for older maps without problems.
Hello everyone, I've just purchased a 2009 VW Touareg V6 TDI and unfortunately it had an after market Radio head unit
So I am looking for an OEM NAVIGATION HEAD UNITE who supports Dynaudio, Rear Camera, North America Navigation ....
If you have one for sell please let me know.
Thank you everyone.
So stage one of my stereo upgrade is replacing the 4 loudspeakers in all for doors. (3 of the 4 are blown) with some Pioneer XR-1800 speakers. I chose these speakers cause they were the closest to the size and power of the original Dynaudio speakers. The challenge being how to mount new speakers...