COMAND Error Codes
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Senior Member
Joined: Feb 2005
Posts: 484
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From: Bay Area CA
2002 C32
COMAND Error Codes
I have a EURO COMAND in my 2002 C32 and whilst in the diagnostics mode I came accfross the following error codes, can anyone shed any light on what (and how important) they are?
SAE Code - B1795
Type - 0x000
Count - 8
State - P
Thanks
SAE Code - B1795
Type - 0x000
Count - 8
State - P
Thanks
MBWorld Fanatic!
Joined: Nov 2001
Posts: 1,148
Likes: 16
From: Berkshire, UK
2004 SL55, 2015 A250d, 2016 GLC250d
MBWorld Fanatic!
Joined: Nov 2001
Posts: 1,148
Likes: 16
From: Berkshire, UK
2004 SL55, 2015 A250d, 2016 GLC250d
Originally Posted by Expat
Thanks, so this is the error code, anyone know what it means?
B1795 Fault in CAN communication with EIS control module
B1795 Fault in CAN communication with EIS control module
EIS is the electronic ignition switch
Clear the error count, and see if it goes up again - most of the time CAN faults are ignorable glitches. (Mute+0 clears the error list)
From memory of a MB document I once read, The EIS acts as the gateway between the body CANbus (i.e the interior) and the engine CANbus (i.e drivetrain) - so will be passing the speed signal, and power signals to the COMAND. I think the Cluster can do that job as-well, but normally its the EIS.
The other thing that causes such errors is if the wrong fuses are installed in the engine bay fuse box. On most engines one control unit tells the car when the power is on, on the 55/600 another control unit does (dunno about the AMG 3.2). This action is controlled by which fuses and relays are installed. If the wrong one is installed then different bits of the car power up at the wrong time and you get transient CAN communication faults that only happen when the car is started (as the control units try to talk to another unit that is still powered off!). (It was this that caused my first SL55 to be delayed by 6 weeks whilst they tried to work out what was wrong - it was basically the first RHD SL55 of the production line and the fuse configuration was set as if it was a SL500) - The fuses can be in wrong place if you've had a new fusebox - which happens when one of the control modules is replaced (its all part of the fusebox). If this was the case, lots of control modules would be logging the errors, and the MB dealer would see this when they did a short-test in Star diagnosis machine - so it is unlikely to be the case - but I think the car still drives fine even with that happening.
Is anything actually going wrong ?
R
Last edited by Richard; Jan 18, 2006 at 03:09 AM.
