Mercedes Benz C 43 AMG Technical Service Bulletin # S-82_64-123 Date: 000201

Mercedes Benz C 43 AMG Technical Service Bulletin # S-82_64-123 Date: 000201

Radio - Fiber Optic Configuration and Cautions

BULLETIN NUMBER:

S-SI-82.64/123

DATE:

February 2000

GROUP:

82

SUBJECT:

167

D2B FIBER OPTIC CONFIGURATION AND VERSION CODING

MODELS:

MODEL YEAR 2000: 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).

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

6. 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.

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

8. 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.

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

169

CD Changer, Telephone and Voice Recognition

Telephone and Voice Recognition

CD Changer Only

No Accessories

b) Vehicles without an optical amplifier:

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

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.

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.