Battery disconnect - immobiliser implications?

[Hibbo]

I'm going to be disconnecting the battery on my E300D to prevent me getting an airbag in the face, will I have any problems with the alarm or immobiliser when I reconnect it?

It has a total closure central locking and alarm system, with a Laserline immobiliser (little two pin thing on the dash).

Thought I'd better post this now rather than post "help! my car won't start!" tomorrow night!

 

[eric242340]

Battery disconnect

The chances of an air bag depoying are extremely small however the chances of upsetting your alarm system are high. Im not sure myself as to the alarm system but if it were me I would not disconnect the battery. Question is why do you need to disconnet? What type of work are you going to do?

 

[Hibbo]

I'm going to be taking the steering wheel off.

I was going to disconnect the battery, then unplug the plug on the airbag control box under the passenger footwell.

 

[television]

Dont you have a fuse for this that can be removed. ?


Malcolm

 

[Hibbo]

Dinna ken, I don't have a haynesey (yet).

I was advised to disconnect the battery prior to removing (and reconnecting)the plug.

Has anyone else done this?

 

[television]

Dinna ken, I don't have a haynesey (yet).

I was advised to disconnect the battery prior to removing (and reconnecting)the plug.

Has anyone else done this?

All workshop manuals say disconnect battery as a safety issue, on the steering wheel theads the battery was removed in both cases.

If you can see the connector for the Air bag, i would pull it out, the only snag is that I would not put it back with the battery connected, so you have a catch 22 situation.


Malcolm

 

[C220GJS]

I've done this job on my car by disconnecting the battery it did not affect the alarm/immobiliser system (Toad) other than resetting options to default and I had to reset the options I had chosen.
There is no need to disconnect the battery if you are taking off the steering wheel to change the column switch ,just do not turn on the ignition until everything is back in place.

 

[Hibbo]

Thanks for the advice so far, I'm off to do the job now.

I AM going to disconnect the battery, so I may well be coming home in the w123.....

 

[John Kerr]

I took the steering wheel off a W203 220 CDI without any problems. I would not like to disconnect the battery because last time I did this it cost me a new rear sam unit.

 

[Hibbo]

Well what a liar I am!

I didn't disconnect the battery, just unplugged the airbag connector (passenger footwell).

I was however somewhat twitchy when I reconnected it, not to mention starting it up again.

Anyway, it was all irrelevant as I couldn't get the blood steering wheel off anyway!

I specifically bought a long T30 torx driver, but it doesn't seem to fit. Can anyone advise as to what the correct size is? (For the two fasteners that you get at from behind the wheel to remove the airbag assy)

 

[C220GJS]

You have a PM.