Hi all, got a 2017 L405 with 3.0 TDV6. I cannot find the aux battery.

I looked on the right hand side of the boot and its not there like it used to be in L494.

I changed the main battery.

I am going after this as my start stop is not working, and i know it needs to meet certain conditions and i changed the main battery as it was knackered but cant find the aux.

I think some L494 did have capacitors instead but not sure if its same on these too? If so where is it located?

Hope this helps


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where the aux battery 'should' be is where the capacitor is located...

goldeneye32 wrote:

Hope this helps


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stan wrote:

where the aux battery 'should' be is where the capacitor is located...

pic above shows where the signal wire can be detached so you get rid of the stop/start.

Have you told the car via diags box it has a new battery, stop start may not work until you do. They do sometimes reset after a while but better to reset with diags box.

@RR4ED:

Relax, I have the same model and year as you, there is no aux battery OR capacitor, only the main battery under the spare wheel.

I have used my iiD tool to change the default behaviour to turn the S/S feature OFF by default.

Why?

Because if used for mainly short urban trips, most engine wear occurs during cranking the engine, plus extra wear & tear on the starter gear and battery. This could cost you dear compared to a very small saving on fuel. I also found it frankly annoying when the engine would frequently cut out at a junction just when I wanted to nip out into a gap in traffic.

So, I think off by default, and on when you choose, is the way to go!

EDIT: AI says the current cost to replace a starter motor is upwards of £600. “If it ain’t broke, don’t fix it” -where’s the fun in that?

@Gremlin500
I totally agree
I have conditioned myself to hit the button after Ghost sequence Engine start then "the button"
Then berate myself when occasionally dementia kicks in  2018 SE SDV8 4.4 Byron Blue

I found the CCF entry to keep it turned off as it's right royal pain! Got - 2017 SDV8 Autobiography in Loire Blue
Had- 2008 TDV8 Vogue SE in Java black
Had - 2007 S/C in Stornoway Grey

Important to say editing the CCF doesn’t DISABLE Start-Stop (on MY17) rather it changes the default behaviour, so the centre console switch is lit up, (indicating S/S OFF) when you turn on the ignition.
If you get stuck in traffic for example, one flick of the switch can turn it ON (light off) as needed, -simples!

Click image to enlarge

Indeed, but it has the same effect as disabling it. I used to have to remember to switch it off every time I start the car. Got - 2017 SDV8 Autobiography in Loire Blue
Had- 2008 TDV8 Vogue SE in Java black
Had - 2007 S/C in Stornoway Grey

Thank you guys, I shall leave it alone.

I am not a fan of start stop I just wanted to make sure if there is a problem with a battery or capacitor and it may be affecting other systems and was going after the symptom of the fault i.e start stop doesn’t work after a battery replacement.

I did code the new battery to the car.