W211 - disabling SBC by disconnecting battery

[glasgow]

Hello, all.

I need to disable the SBC (2005 W211 E280 CDI) in order to replace the brake pads. I don't have Star diagnostic to disable the SBC so I take it I would need to disconnect primary and SBC batteries.

I am just concerned that disconnecting the battery may upset the car electronics. Any advice what is the best way to do it please.

Thank you

A

 

[Mrhanky]

Hello, all.

I need to disable the SBC (2005 W211 E280 CDI) in order to replace the brake pads. I don't have Star diagnostic to disable the SBC so I take it I would need to disconnect primary and SBC batteries.

I am just concerned that disconnecting the battery may upset the car electronics. Any advice what is the best way to do it please.

Thank you

A

Lock the car and stick the keys well away from car. The SBC will not activate with the car locked.

Alternative is to disconnect the multi plug at the SBC unit.

 

[glasgow]

Thank you.

Heard that disconnecting the multi-plug may give some trouble and error messages.

 

[John]

Lock the car and stick the keys well away from car.

...but nowhere near young fingers!

I would personally hide them somewhere...

 

[richard]

Lock the car and stick the keys well away from car. The SBC will not activate with the car locked.

Alternative is to disconnect the multi plug at the SBC unit.

I would not risk this. You may lose your fingers.

 

[pmcgsmurf]

Tried the locking the car & hiding the keys but in the end every time I disconnect both batteries on the W211, same on the W212.
Just don't like the idea of fiddling around with the calipers while the car still has power connected.

 

[Auto-mobile]

Everyone seems to worry about this on sbc cars, I don't know why, it's very simple.

Drivers window down
key in ignition
ignition in off position
door shut
Replace brakes and don't open the door or turn on the ignition.

 

[pmcgsmurf]

Replace brakes and don't open the door or turn on the ignition.

Yes, but it would be easy to be working in a workshop on the NSF caliper and someone else walks in and opens the door.
Our own risk assessment would require battery disconnecting or the car locked with the keys locked in a cabinet where only the working technician has the key.

It's hardly a lot of effort and if it reduces the chance of an accident to minimal can only be a good thing.

Probably different of course if you are doing the job yourself on your drive.