W164 Airbag - Do I need to disconnect both batteries?

[jozza66]

I have a new steering wheel to fit to my 2011 ML350, having spent some time researching, I can't find a definitive answer on whether I need to disconnect the auxiliary battery as well as the main battery.

Are there any pitfalls to pulling the aux battery? Car is due at the dealer on Monday so if the SRS system lights up I can have it reset then if needs be...

Thanks.

John.

 

[jozza66]

Main battery seemed to be fine

 

[johns E350]

Did you disconnect both batteries. Was all working correctly when reconnected???

 

[jozza66]

Nope, just the main battery, all fine upon reconnecting, so SRS lights or issues - which is good!