Comand Wiring

[miro]

if your car is a can car you dont have to weld anything. if the car is not a can car, then you have to make the comand free from can egagement.

I really think this is going to some kind of extreme. A lot of the W208 COMAND modules can be adjusted with Diagnostic alteration of settings within the unit. No soldering required.

Is it only my own insane logic dictating you should use the appropriate COMAND in the first place. Alterations can only lead to complications and almost impossible trouble shooting.

 

[SilverSaloon]

i think there is some confusion to what i want to achieve:

My car is a pre-facelift car (ie there are no canbus wires from the cluster to comand as standard)

SO....

i fitted a CANBUS-ENABLED COMAND, a FACLEIFT CLUSTER and a multifunction steering wheel. connected 2 canbus wires from the cluster to the comand.

So i do need the comand to be canbus enabled as i need to operate it using the wheel.

All this works, it just drains the battery if i leave the canbus wires connected when the ignition is off.....

 

[thejack]

where did you get the can signals from?

 

[SilverSaloon]

where did you get the can signals from?

from the cluster. cant remember off hand what pins it was, but they are correct as the wheel controls the comand fine and the radio display/nav stuff appears on the cluster

 

[thejack]

ok so it seems to be right connected. what happens to the "on" button and cooling fan after 15 seconds from cut off? (take away the ignition key) fan has to stop and backlit of ON button has to shut down. dont they?

 

[miro]

i think there is some confusion to what i want to achieve:

My car is a pre-facelift car (ie there are no canbus wires from the cluster to comand as standard)

SO....

i fitted a CANBUS-ENABLED COMAND, a FACLEIFT CLUSTER and a multifunction steering wheel. connected 2 canbus wires from the cluster to the comand.

So i do need the comand to be canbus enabled as i need to operate it using the wheel.

All this works, it just drains the battery if i leave the canbus wires connected when the ignition is off.....

Putting everything through a diagnostic would be one way to find out.

 

[thejack]

ya...

 

[SilverSaloon]

ok so it seems to be right connected. what happens to the "on" button and cooling fan after 15 seconds from cut off? (take away the ignition key) fan has to stop and backlit of ON button has to shut down. dont they?

they only do this if the canbus wires are not connected to comand. i have cut the canbus hi/lo to comand when ignition is off via a relay - seems to fix it and the comand & fan does turn off properly which it wasnt doing when the can lines were left on.... however i still got a drain but not as bad....

 

[thejack]

my car, a c class 200 cdi pre facelift, has been updated by retrofitting a comand 2.0 bosch unit. however it's been quite easy to connect the head unit to the can bus already present in the car. everything is working great. i put also in the aux wiring but not into the glove box but i put it into the can holder in the central console where the lighter is placed. when i take away the ignition key , the fan cooling and the on button stays up for 15 sdeconds then they goes down. every action you take on the car as touch brake pedal or close doors or anything electrical, it cause the fan and the on backlite to start for 15 seconds. then if you do not swicth on the uniti the back again into thier standby position. this is what happens to my car.

 

[miro]

they only do this if the canbus wires are not connected to comand. i have cut the canbus hi/lo to comand when ignition is off via a relay - seems to fix it and the comand & fan does turn off properly which it wasnt doing when the can lines were left on.... however i still got a drain but not as bad....

I notice in your SIG you quote that there is an onboard PC on its way. I have been doing some very rough testing (not using generators) and I have been having trouble figuring out which RGBS signal is appropriate for COMAND.

I have a TV tuner with RGB?? output and I cant seem to make the picture lock into a stable pattern.

Do you or anyone else have a lead to some more information about the requirements of COMAND for RGB data ? There are only two people I know that can do this work and neither of them are available.