Information Bus: Service and Repair

Installing Optical Waveguide

Tools







Preliminary work

INFORMATION:
- Release the main wire harness only until the damaged optical waveguide has been released and the new optical waveguide can be attached to the main wire harness.
- Expose main wire harness.

Optical waveguide variants

INFORMATION: Depending on the equipment I No., the installation positions of the audio components in the front luggage compartment differ.

MOST control units, variant A - B - C







MOST control units, variant A - B - D







MOST control units, variant A - B - C - D







MOST control units, variant A - B - E







MOST control units, variant A - B - C - E







MOST control units, variant A - B - D - E







MOST control units, variant A - B - C - D - E







MOST control units, variant A - B - C - F







MOST control units, variant A - B - D - F







MOST control units, variant A - B - E - F







Installing optical waveguide

Disconnecting optical waveguide

INFORMATION: Observe the general information on optical waveguides. - General information on optical waveguides - MOST bus.

CAUTION:
Risk of destruction when removing electric components with the ignition on.
- Switch off ignition and remove ignition key.

1.







2. Release the connectors of the damaged optical waveguides on the affected components -Arrow a- and disconnect them. The illustration shows the connector on the CD changer as an example.
3. Cut off the connector of the damaged optical waveguide, isolate it and tie it to the main wire harness.

Removing and installing optical contacts on connector side







1. Open the secondary locking mechanism using the press-out and unlocking tools for tab and round plug connectors of all sizes NR.155. Insert the tool in the opening provided and lift the locking mechanism. The locking mechanism engages in the upper position.







2. Position the press-out and unlocking tools for tab and round plug connectors of all sizes NR.155 on the primary locking mechanism and lift the locking mechanism.
3. Carefully pull on the optical waveguide -A and B- in -direction of arrow-. If it is not possible to pull out the optical waveguide, check again if the secondary locking mechanism is completely released and if the primary locking mechanism is raised sufficiently.

Perform visual inspection of locking mechanisms, connector housings and contacts for possible damage, and exchange the damaged parts, if necessary.

Installing optical contacts on connector side
Remove the dust boot right before plugging.

Check the proper condition of the contacts.







1. Insert the optical contact -A and B- in the connector until it engages audibly.







2. Lock the secondary locking and check the optical contacts for tightness.

Removing and installing optical contacts on socket side







1. Release the spring cap on both sides using the press-out and unlocking tools for tab and round plug connectors of all sizes NR.155 and remove it.
2. Remove optical waveguide module from connector.







3. Position the press-out and unlocking tools for flat-type and round plug connectors of all sizes NR.155 for releasing the contact locking mechanism of the optical waveguide module and lift up the locking mechanism.
4. Carefully pull on the optical waveguide -A and B- in -direction of arrow-. If it is not possible to pull out the optical waveguide, check again if the locking mechanism is completely released.

Perform visual inspection of locking mechanisms, connector housings and contacts for possible damage, and exchange the damaged parts, if necessary.

Installing optical contacts on socket side
Remove the dust boot right before plugging.

Check the proper condition of the contact.

At a force of 10 N (7.5 lb.) the springs installed in the connection point will be compressed. This leads to an increase in attenuation, which could lead to system impairment and system failure. Therefore a maximum force of 10 N (7.5 lb.) may be used to pull on optical waveguides at connection points.







1. Insert optical contact -B- into the optical waveguide module until it is felt to engage, and check the optical contact is seated securely.
2. Insert optical waveguide module into the connection point on the socket side.







3. Slide the spring cap on the connection point until it can be felt to engage -arrow-.

Installing optical waveguide

INFORMATION: Observe the general information on optical waveguides.

1. Cut off the optical contacts of the damaged optical waveguide, isolate it and tie it to the main wire harness.

INFORMATION:
- The range of spare parts available for optical waveguides depends on the vehicle equipment. Depending on the vehicle equipment, there is a specific set containing the individual optical waveguides.
- Select the required optical waveguide and remove it from the set.







2. Route the new optical waveguide along the main wire harness, guide it through the existing cable ducts and tie it to the main wire harness using tie-wraps.







3. Connect the connectors for the new optical waveguide to the affected parts until the connectors are felt to engage. The illustration shows the connector on the CD changer as an example.
4. Read out fault memory and erase if required.
5. Check operation of audio components.

Subsequent work
Install components for releasing main wire harness.