Fault in can communications with N73 EZS control module?

ALAEDDIN IBRAHIM BEN GHARBIA

MEMBER
2005 MERCEDES BENZ C200
1.8L
4 CYL
2WD
AUTOMATIC
138,000 MILES

My car has gear shift level disappeared from IC, the ac condition unavailable on can bus means not running, parktronic does not working no volts for bumpers but it is working with no fault and flashing when ignition on only reverse lights does not go on when r gear in but from SAM test it is light on audio 20 fault can communication with N73 both SAMs f and rear fault is also can N73 fault can communication.

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,959 POSTS

Can I ask if a CAN scan was done? You can get a CAN scanner (Controller Area Network) which will work on most cars from Amazon.

here is a video to show you how:

https://youtu.be/u-4syLc-ifQ

and

https://www.2carpros.com/articles/can-scan-controller-area-network-easy

Here is one for about $99.00 if you need it:

https://amzn.to/3ZixY4v

We should start by checking the fuses, here is a guide that should help.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

The Audio 20 fault suggests a problem with the audio system. If both the front and rear SAM modules are experiencing faults, it could indicate a problem with the modules themselves or a wiring issue. Similarly, if the N73 module (which is responsible for communication) is also experiencing faults, it could be related to a wiring issue or a malfunctioning module.

It is common for the SAM modules to go out if all fuses are good, I would try swapping the SAM module out. Here is how in the images below.

Images (Click to make bigger)