I saw this suggestion in another thread regarding resetting the centre brake light by disconnecting the pos cable on the battery for 30 seconds and want to try it but before I do I am curious as to what settings I will lose, if any?

“So, it may look as though CHMSL is dead (all LEDS out), but it is because you have no output from CA129-9. The only way I have found to reset the output is to disconnect positive battery terminal for 30 seconds....when you hook it back up, waalaa, CHMSL lights back up”

Thanks
Alan

 

Likely to lose all learned values (fuel trims, OBD monitors will reset so you would fail smog, etc) and window settings I expect.

 

Performing a reset is an annual occurrence for me.

All of the reset operations are covered in your owners manual. These include
engine adaptations, window reset, seat reset.

And gives you the opportunity to enjoy an Italian tune up.

 

Thanks, I can live with those. I do recall Cali smog being a pain after OBD monitors refused to reset on my xk8 but not an issue here in South Africa thankfully!

 

Ok did that but no difference to the boot brake light, will just be a nice fancy refector from now on I suppose.

 

hey Guy may I ask your reasoning for an annual reset? Sounds fair to me just curious

 

Yes..seems to reset all gremlins and car runs smooth as silk..

Psychological??

I only have to set windows and parking brake.oh and the clock, seat memory

 

Precisely right. Starting off with the “non-persistent” codes cleared keeps the annoyances away. All part of my spring cleaning and prep for the new year.

Firstly, be sure battery reads 12.6+ before reconnecting.

Those annoyances can include non responsive touch screen, AFS misbehaving, bluetooth causing media interupted service, climate control not responding, the dreaded epb issue, tpms showing fault, check engine light due to some minor hiccup.

The additional value, reset adaptations for the new year. Confirm the battery can charge and hold 12.6v. Ensure epb is operational. And best yet, an excuse to be left alone for that italian tune up, which invariably takes me 1-2 days as I tend to go somewhere fun.