Complete Loss Of Vehicle System Audio - Motorola V60 Series Manual

5. Install a known good compensator. Connect vehicle antenna to connector marked
"antenna" on the compensator.
Is "NO SVC" indicator off?
No- Reinstall original compensator. Go to next STEP.
Yes - Original compensator faulty. Perform "Initial Installation" checks. END.
6. Disconnect the coil cord RF connector at the center console. Install a double-sided
female adapter on the coil cord RF connector and attach the magnetic mount antenna.
Is the "NO SVC" indicator off?
No- Go to next STEP.
Yes - Antenna cable between coil cord and the compensator defective. END.
7. Install a known good coil cord.
Is the "NO SVC" indicator off? No
- Go to next STEP.
Yes - Original coil cord defective. END.
8. Install a known good portable phone.
Is the "NO SVC" indicator off?
No- Contact the Mercedes-Benz Regional Technical Support Specialist as no other components
can be involved. Document further diagnostic problems, results, repairs and record on work
order. END.
Yes - Original portable phone defective. END.

4.4.9 Complete Loss of Vehicle System Audio

Any of the devices in the list below can cause loss of system audio. The specific device
configuration will vary depending on the options installed and the vehicle type. Use the basic
troubleshooting technique below for all devices except the head control unit, also reference
phone manual for further information.
Head control unit
Audio amplifier
Voice recognition module
Phone Support Electronics module
CD player
Tele-Aid II module
LEVEL 1: Basic Device Troubleshooting Technique
1. One device at a time, remove the fiber optic (D2B) cable and complete the D2B network by
connecting a jumper joining the 2 ends of the cable just removed.
2. Power cycle the Head Unit off and on. Select radio function.
Mercedes Benz Telephone Manual v4.6
4.0 Troubleshooting Section
Date: 09/01/2004