Possible cause of fault
- An optical (optical waveguide) or electrical (PCM2) open circuit in the ring.
- MOST switch in production mode.
- An optically/electrically faulty MOST control module is connected to the MOST.NOTE:
- The MOST optical waveguide is connected to the following control modules:
- PCM2 as of model year 2003.
- CD changer.
- Amplifier.
- Telephone/telematics.