Fiber Optic Cable Harness, Repairing

Fiber optic cable harness, repairing

Removal and Installation

Note! As the illustrations in this service information are used for different model years and / or models, some variation may occur. However, the essential information in the illustrations is always correct.

General




The components in the infotainment system are part of an optical network, known as the MOST bus. (Media Oriented System Transportation). The network consists of fiber optics (POF = Polymer Optical Fibers), special connectors for fiber optics and MOST nodes, i.e. control modules which are connected to the MOST bus.
Data is transmitted via the fiber optics, for example music, in the form of light signals. The MOST bus is a ring which must be unbroken for it to work. None of the infotainment system will work if an optical fiber breaks or if a connector is disconnected. The ends of the fibers must also be clean to allow the light to pass.




A fiber requires a larger bend radius than a copper cable. The bend radius must not be less than 25 mm. If the fiber bends too much, not enough light will be let through.

Note! Fiber optics must not be spliced.Damaged fiber optics can be repaired if there is sufficient length remaining to install a new ferrule (4). If the remaining fiber is not long enough, a new fiber optic must be routed parallel to the damaged fiber.

Note! Fiber optics are sensitive to bending and pinching. Be careful when routing and securing.

Disassembling the connector (2)





Note! There is one fiber for the input and one for the output signal. The system will not work if the are interchanged.

Press out the catch (1) using a screwdriver.




Open the catches (3) using a screwdriver.
Pull out the ferrule (1). Make a note of its location.

Disassembling the combined connector (optic and electrical conductor) (1)




Release the lock using a screwdriver. Remove the inner section (2).
Remove the ferrule. See Disassembling the connector (2)

Installing the ferrule




Cut the required length (+10 mm) of fiber optic.
Strip the fiber optic. Use tool 951 2868 Fiber cutter 951 2868 Fiber Cutter as illustrated




Strip the fiber optic. Use tool 951 2868 Fiber cutter 951 2868 Fiber Cutter as illustrated.




Align the ferrule. Use tool 951 2869 Ferrule crimping tool 951 2869 Ferrule Crimping Tool as illustrated.




Check that the ferrule is secure and is edge to edge with the fiber.

Assembling the connector





Note! There is one fiber for the input and one for the output signal. If they are mixed up the system will not work.

Press the ferrule (1) into place in the connector (2).




Install the catch (1).

Assembling the combined connector (2 optic and 4 electrical conductors)
Install the ferrule. See Assembling the connector.




Press the inner section into place in the combined connector.

Finishing work
Check the repair. See Diagnostic Instructions - Fiber Optic Cable Diagnostic Instructions - Fiber Optic Cable.