2017 Mercedes Benz C 43 AMG Diagnostic and Repair# S-82_64-123 Date: 000201

Radio - Fiber Optic Configuration and Cautions
BULLETIN NUMBER:
S-SI-82.64/123
DATE:
February
GROUP:
82
SUBJECT:
Mercedes Benz C 43 AMG (202.033) V8-4.3L (113.944) Page 167
D2B FIBER OPTIC CONFIGURATION AND VERSION CODING
MODELS:
MODEL YEAR : 129,163, 170, 202, 208, 210, 215, 220
Following are fiber optics installation general handling notes and generic configuration diagrams for the above referenced vehicles. Model specific
references are included where applicable.
A. D2B General Notes

1. Fibers are easily damaged and must be handled with care to prevent cuts, nicks, abrasions, kinks and/or crushing.


2. Fiber minimum bend radius is 25 mm. A bend radius less than 25 mm will permanently damage the fiber, thus necessitating replacement.

Figure 1
3. Optical fibers have a ring type configuration (i.e. The output of the previous component is coupled to the input of the next component in a
daisy chain type loop. The ring must form a closed loop in order to function [Figure 1]).
4. Light enters the clear fiber (input) and exits the red fiber (output). Each active D2B connector must therefore contain one red and one clear
fiber (Figure 1).

1. The red fiber is always on the chamfered side and the clear fiber on the square side of the connector (Figure 1).


2. All fiber connections or couplings should follow a clear to red logic. A coupling must never contain two fibers of the same color (Figure 1).

Note:
Due to the keying of the fibers this would only be possible through forced insertion.

1. Fiber optic (D2B) cables are identified by orange/brown semi-rigid insulation


2. The fibers are loosely pre-wired with the vehicle electrical harnesses in most applications. The fibers are not affected by electromagnetic

interference (EMI) from the bundled vehicle electrical harnesses.
B. CONFIGURING THE D2B RING
1. Vehicles delivered from the factory may have active fibers (e.g. optical amplifier and/or factory installed CD), inactive fibers (e.g. no
amplifier or accessories installed), or no fibers Vehicles will vary in accordance with equipment installed. Some vehicles will have all required
fibers installed while others will contain additional fiber links in the accessory kit(s). Refer to the respective accessory reference for fiber
location information.
2. To remove/install components the D2B ring must be 'broken' and the appropriate adjustments made to the configuration. One or all of the
following optical connector styles may be present.
Mercedes Benz C 43 AMG (202.033) V8-4.3L (113.944) Page 168
Figure 2
a) In-Line Coupler (Figure 2) Disassemble by gently prying up, from the side of the clip closest to the connector, one or both of the metal
spring clips on either side of the connector.
Figure 3
b) 90-degree angle connector (Figure 3) Disassemble by gently separating the two plastic housing halves.
c) Straight connector (not shown: similar to Figure 3, but straight) Disassemble by gently separating the two plastic housing halves.
3. Exercise extreme care when disassembling connectors and handling fibers to ensure that no fiber ends are damaged. Fiber end damage will
result in light loss that may lead to intermittent D2B ring operation and/or failure.
4. The 02B ring configuration steps vary in accordance with the vehicle's equipment level and necessity to add or remove. Use the following
illustrations as guides in determining how to configure the D2B ring:
a) Vehicles with an optical amplifier:
Key to Figures
Mercedes Benz C 43 AMG (202.033) V8-4.3L (113.944) Page 169
CD Changer, Telephone and Voice Recognition
Telephone and Voice Recognition
CD Changer Only
No Accessories
b) Vehicles without an optical amplifier:
Mercedes Benz C 43 AMG (202.033) V8-4.3L (113.944) Page 170
Note:
Model 163 vehicles do not have an optical CD changer
Key to Figures
CD Changer, Telephone and Voice Recognition
CD Changer and Telephone
Telephone Only
Mercedes Benz C 43 AMG (202.033) V8-4.3L (113.944) Page 171
CD Changer Only
Telephone and Voice Recognition
C. D2B RING VERSION CODING
1. The D2B master (radio or head unit) must recognize the ring configuration in order for the D2B ring to properly function. The ring
configuration is critical to the proper function of the D2B self-diagnostic systems. Improperly version coded rings may intermittently
malfunction and will generate false diagnostic trouble codes (DTC's).
2. Version coding may be performed using either StarDiagnosis (DAS) and/or the Hand-Held Tester (HHT). While the exact path to the version
coding screens may differ according to the equipment used and software updates made the following sample path represents how to access this
function on the diagnostic equipment:
- Control units/Information and communication/D2B/Control unit adaptations/D2B nominal configuration
3. Once in the configuration screen, the individual D2B components must be set to the appropriate configuration The tables below illustrate
proper version coding assignments based on a variety of sample configuration scenarios:
Note:
These tables are for sample purposes only. Refer to the model specific instructions for proper ring configuration.
Mercedes Benz C 43 AMG (202.033) V8-4.3L (113.944) Page 172
Table 1 - Vehicles equipped with optical amplifier (Models 215, 220)
Table 2 - Vehicles without optical amplifier (Models 129, 163, 170, 202, 208, 210)
Note:
Model 163 vehicles do not have optical CD changers
4. Confirm that the programmed and actual configurations are the same once the ring has been properly version coded. This can be accomplished
by using the D2B actual values function. Again, the paths to access this feature may vary depending on the test equipment and software level,
but the following is a representative sample:
- Actual values/D2B Actual configuration
5. Verify that the version coding input (specified value) matches the actual configuration performed during installation (actual values). If a
difference exists, toe ring has been improperly configured and must be disassembled to diagnose the error and corrected.
CAUTION!
DO NOT alter the configuration in point 3 to match the vehicle configuration. Failure to have the configuration set as indicated in the above tables
will result in erroneous system operation and/or intermittent failure of some or all components as well as failure of the diagnostic system to provide
accurate diagnostic messages.
6. Check the DTC memory of all installed components and the head unit. Any present DTC's should be diagnosed, identified, corrected and the
DTC memory cleared.
Note:
Powering up a newly installed system prior to version coding will set D2B ring configuration errors. These errors may be ignored during the initial
DTC check. If, after clearing the DTC's, they return in subsequent operation of the system, a configuration error is present that must be located and
corrected.
7. Perform a short functional test on the D2B system group and confirm that no new DTC's have been set.