Notes on fiber optic cable - AH82.70-P-0001-02A

Model 129, 163, 168, 170, 202, 203, 208, 209, 210, 215, 220, 230, 414, 463.243/244/245/246/247/248/249/ 250/254/270/271/303/309/322/323/ 332/333/340/341

Illustrated on Model 202 sedan

Fig 1: Fiber Optic Cable Function Diagram - Illustrated On Model 202 Sedan

Position of the identification

For vehicle models 170, 202, 203, 208, 210, 215, 220, 230, 463 an identification plate is located on the fiber optic cable wiring harness behind the radio on which the fiber optic cable modules (1, 2, 3, 4) specially fitted to these vehicles are specified together with their exact length.

With models 129, 414 the identification plate is in the trunk next to the CD changer.

With model 168, the identification plate is in the passenger footwell in the area of the control unit box. If there is no length specification on the identification plate, the respective fiber optic cable module must be removed and the necessary length measured.

Vehicle model 163 does not have any identification plate.

With repairs, the individual fiber optic cable modules with corresponding length specification can be ordered (see spare-parts documentation Group 82).

Fig 2: Identifying Identification Plate On Fiber Optic Cable Wiring Harness

Routing

The inserts (5) of the fiber optic cable modules may only be routed as in production. The fiber optic cable modules must always be provided with a protective cap when routing. For every vehicle model, the sequence of components in the D2B ring is specifically predetermined. The components are connected by fiber optic cable modules. They are secured to a wiring harness with an orange colored casing.

Fig 3: Identifying Fiber Optic Cable Modules

Danger of breaking! Do not kink fiber optic cable, route over sharp edges or bend in radii smaller than 25 mm. Tensile forces on inserts must not exceed 65 N.

The fiber optic cable must not be exposed to temperatures greater than 85 °C or lower than -40 °C. Do not squeeze fiber optic cable, in other words do not compress with clamps or cable ties.

Connection between the devices

The Digital Data Bus ring (D2B) connects the new radio generation and COMAND (monitor) to the CD changer (CDC) (USA preinstallation), telephone and portable CTEL. The sound amplifier remains wired as before with Models 129, 170, 202, 208 and 210. The radio and COMAND as head unit (HU) performs the master function and also forms the interface to the Control Area Network bus Class B (interior) (CAN-B) (for vehicles with multifunction steering wheel).

Ring sequence of vehicles/models/interface

Model 129 HU - telephone (or Tele Aid) - CDC - HU

Model 163 HU - Sound - CDC - telephone (or TELE AID) - HU

Model 168 HU - telephone - CDC - HU

Model 170 HU - telephone - HU (ECE); HU - CDC - HU (Japan)

Model 202/208 HU - CDC - telephone (or Tele Aid) - VCS - HU

Model 203/209 HU - sound - portable CTEL interface - VCS - CDC - HU

Model 210 HU - CDC - VCS - telephone (or TELE AID) - HU

Model 215/220 HU - sound - CDC - telephone (or Tele Aid) - VCS - optional portable CTEL interface - HU

Model 230 HU - Sound - CDC - Telephone (or TELE AID) - SBS - HU

Model 414/463 HU - CDC - telephone - HU

The sequence represents the current maximum equipment. If special equipment (SA) is omitted, the respective item is deleted, resulting in a new ring sequence.

Read out actual configuration using STAR DIAGNOSIS

As of September 1999 it is possible to read out the current actual configuration of a functioning D2B ring by means of STAR DIAGNOSIS. This is particularly important in the case of later expansion of the D2B ring and when retrofitting D2B components e.g. telephone.

In the diagnosis system there is the menu item "Retrofitting D2B components". Under this menu item, the current actual configuration of a vehicle can be read out and written back immediately as a new nominal configuration. The process is self-explanatory.