WIS 82.90 On-board Communication System, Multi-function Steering Wheel
CAN (Controller Area Network)
Description - CAN (Controller Area Network)
The CAN (Controller Area Network) Bus is a digital computer network which provides:
- A digital communication link between multiple Electronic Control Modules (ECM).
- Provides message specific addressing.
- A two wire, bi-directional communication link with data transmitted according to priority.
- The two wire (CAN H and CAN L) method ensures that any interference picked up in the wires is common to both CAN H and CAN L signals and is not "seen" by the receiving module.
The W220 has two separate CAN (Controller Area Network) Bus systems.
- CAN C - Engine CAN (also known as Chassis CAN) which has fast communication speeds of 125 kbps or 500 kbps.
- CAN B - Interior CAN (also known as Body CAN) which has communication speeds of 83 kbps.
Example - W220 CAN B Network
The CAN B or Interior CAN is also known as Body CAN.
Issues - CAN (Controller Area Network)
- If one wire becomes faulty the CAN signal should still get through.
- If both CAN H and CAN L signals are faulty no communication is possible.
Diagnosing - CAN (Controller Area Network)
Using the STAR DAS is the best method to diagnose CAN function.
Alternatively, for simple analysis, CAN Signal Levels can be measured using an oscilloscope with respect to 0V or Ground or differentially between CAN H and CAN L at any CAN Bus Connector.
Warning! Be careful of causing electrostatic damage to electronic components.
Typical Connector - CAN (Controller Area Network)
(Note wire pairs)
Typical Signal Levels - CAN (Controller Area Network)
- CAN H (High) steady 0.025V when the CAN Bus is dormant (not communicating) and,
- CAN H (High) 0.65V amplitude when the CAN Bus is communicating.
- Signal data for CAN H is a voltage level going high.
- CAN L (Low) steady 11V when the CAN Bus is dormant (not communicating) and,
- CAN L (Low) 4.65V amplitude when the CAN Bus is communicating.
- Signal data for CAN L is a voltage level going low.
Central Gateway (CGW/ZGW)
Firmware Update
The firmware of Central Gateway (including CAN System Diagnosis interface) can be updated using SDS under "CGW - Central gateway -> Control unit adaptations -> Control module programming". However, since the update process goes online to pull latest firmware version the procedure can be done only by the dealer using their Star Diagnosis machine.
The latest CGW software version available for A2115403545 (checked April 2015) is 12/2003 (CGW Diagnosis identifier SDS Diagnosis identifier 1/2).
Software Version in SDS
Software version can be read in SDS under "CGW - Central gateway -> Control unit version" and "System diagnosis (only interior CAN fault) -> Control unit version".
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Software Version in SDS Quick test log
SDS initial quick test log will display CGW and System diagnosis software version.
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Translation of CGW Items
BenzWorld Member Ex-Fed states that when you start Xentry/DAS, you get a nag screen in German after the NOTES screen.
- "Ihr System ist mit der Berechtigung "Developer-Kit" ausgestattet.
- {Your system is equipped with the permission "Developer Kit".}
Developer Mode is in German because its meant for factory techs only. It allows delving into factory level settings/programming on about everything in the car. You can do some interesting things, but be warned, you can make your car a smoking hole too.
With thanks to MBWorld Member VII at [1] here is a translation for the CGW Items for his vehicle.
Note SA Codes refer to the equipment on the vehicle when delivered and as listed on the Vehicle Data Card.
SA: Plattrollwarner vorhanden SA: Flat Roll Warner available| German | English |
|---|---|
| Links-/Rechtslenker Linkslenker (LL) | Driver Position LHD (LL) |
| Länderbezogene SA Codierung Rest der Welt (RDW) | Country-Specific Coding SA Rest of the world (RDW) |
| MSS: Taxi Stromversorgung (C450/965) nicht aktiv | MSS: Taxi Power (C450/965) not active |
| MSS: Taxi Notalarm-Anlage (C934) nicht aktiv | MSS: Taxi Emergency Alarm System (C934) not active |
| MSS: Anschluss für Dachzeichen (C342) nicht aktiv | MSS: Connection for Roof Sign (C342) not active |
| MSS: Taxi Hilferuf (C930) nicht aktiv | MSS: Taxi Call For Help (C930) not active |
| MSS: Sonderfahrzeug (C970/C974/C975/Z90) nicht aktiv | MSS: Special Vehicle (C970/C974/C975/Z90) not active |
| MSS: Taxi Funkaufschaltung (C938) nicht aktiv | MSS: Taxi Radio Override (C938) not active |
| MSS: Umbau für Behinderte nicht aktiv | MSS: Remodeling For Disabled not active |
| MSS: Sonderschutz Guard B4 (Z04) nicht aktiv | MSS: Special Protection Guard B4 (Z04) not active |
| MSS: Sonderschutz Guard B6/7 (Z06) nicht aktiv | MSS: Special Protection Guard B6 / 7 (Z06) not active |
| MSS: Notöffnung aktiv | MSS: Emergency Opening active |
| Modus Komfortlauf manuell | Comfort Mode running manually |
| Modus Umluftkomfortlauf automatisch | Recirculation Mode Comfort Free automatically |
| Umluft Komfortbetätigung aktiv | Convection-touch Control active |
| Baureihe BR 211 | Series BR 211 |
| Karosserie W-Limousine (W) | Bodywork W-Sedan (W) |
| Motor M272 E35 od. M272 DE35 / M272E35_DE35 | Engine M272 E35 od. M272 DE35 / M272E35_DE35 |
| SA: Komm-Plattform vorhanden | SA: Come Platform available |
| SA: Fahrersitzmemory (C275) vorhanden | SA: Driver Seat Memory (C275) available |
| SA: Komfort-Schaltgetriebe (C424) nicht vorhanden | SA: Comfort-Manual (C424) non-existent |
| SA: Automatik-Getriebe (C423) vorhanden | SA: Automatic Transmission (C423) available |
| SA: Klimaanlage vorhanden | SA: Air Conditioning available |
| SA: Scheinwerferreinigungsanlage (C600) vorhanden | SA: Headlight Cleaning System (C600) available |
| SA: Xenonlicht (C612) vorhanden | SA: Xenon Light (C612) available |
| SA: Soundsystem (C810) vorhanden | SA: Sound System (C810) available |
| SA: CD Changer vorhanden | SA: CD Changer available |
| SA: Automatischer Ladeboden nicht vorhanden | SA: Automatic Loading Floor non-existent |
| SA: Heckdeckelfernschließung nicht vorhanden | SA: Remote Boot Lid Closing non-existent |
| SA: Standheizung (C228) nicht vorhanden | SA: Heater (C228) non-existent |
| SA: GPS-Box nicht vorhanden | SA: GPS Box non-existent |
| SA: Abstandsregeltempomat (C219) nicht vorhanden | SA: Adaptive Cruise Control (C219) non-existent |
| SA: Scheibenwaschbehälter (C875) vorhanden | SA: Washer Bottle (C875) available |
| SA: Komplettes Ersatzlicht nicht erlaubt | SA: Complete Replacement Light not allowed |
| SA: Keyless Go (C889) nicht vorhanden | SA: Keyless Go (C889) non-existent |
| SA: Innenraumschutz (C882) nicht vorhanden | SA: interior Protection (C882) non-existent |
| SA: Diebstahlwarnanlage (C551) vorhanden | SA: Alarm System (C551) available |
| SA: Heckrollo (C540) vorhanden | SA: Rear Blind (C540) available |
| SA: Anhängerkupplung (C550) nicht vorhanden | SA: Towbar (C550) non-existent |
| SA: Parktronicsystem (C220) nicht vorhanden | SA: Parktronic System (C220) non-existent |
| Änderungsjahr /2 | Change Year /2 |
| Jahresangabe 2004 | Year Value 2004 |
| CAN-C: E-Sauglüfter Grundbelüftung ein | CAN-C: E-Extractor Basic Ventilation, wear |
| CAN-C: Abstandsassistent nicht vorhanden | CAN C: Distance Wizard non-existent |
| CAN-C: Parkassistent nicht vorhanden | CAN C: Park Assist non-existent |
| CAN-C: Bremsender Tempomat nicht vorhanden | CAN-C: Braking Cruise Control non-existent |
| CAN-C: Klimaanlage vorhanden | CAN-C: Air Conditioning available |
| CAN-C: Luftfederung nicht vorhanden | CAN-C: Air Suspension non-existent |
| CAN-C: Sportpaket nicht vorhanden | CAN C: Sport Package non-existent |