Test L: The Satellite Audio Is Inoperative/Does Not Operate Correctly

PINPOINT TEST L: THE SATELLITE AUDIO IS INOPERATIVE/DOES NOT OPERATE CORRECTLY

Normal Operation
The satellite radio receiver receives voltage through circuit SBP14 (BN/RD) and ground through circuit GD115 (BK/GY). Digital signals are received by the satellite radio antenna and sent to the satellite radio receiver. The audio signals are then sent to the audio unit.

Circuits VME41 (GN/OG), RME41 (YE/BU), VME42 (VT/BN), and RME42 (YE/BU) transmit left and right channel audio signals to the audio unit. When there is a fault on any of these circuits, the audio quality is reduced. If the circuits for a specific channel are shorted together, loss of audio on that entire channel will occur. This can be detected by using the satellite radio tones test.

In order for the satellite radio system to operate, messages are sent from the front control interface module (FCIM) to the audio unit when a button is pressed. The audio unit responds with the appropriate function.

The satellite radio receiver sends messages to the front display interface module (FDIM) in order to display satellite radio information on the display screen.

DTC U0184 (Lost Communication With Radio [ACM]) - sets when the satellite radio receiver is missing messages from the audio unit for greater than 5 seconds. This results in loss of satellite radio functionality.

DTC U0193 (Lost Communication With Digital Audio Control Module [SDARS]) - sets when the audio unit is missing messages from the satellite radio receiver for greater than 5 seconds. This results in loss of satellite radio functionality.

DTC U0255 (Lost Communication With Front Controls Interface Module) - sets when the satellite radio receiver is missing messages from the audio unit for greater than 5 seconds. This results in loss of satellite radio functionality.

DTC U0256 (Lost Communication With Front Display Interface Module) - sets when the satellite radio receiver is missing messages from the audio unit for greater than 5 seconds. This results in loss of satellite radio information being displayed on the front display interface module (FDIM) screen. To diagnose this DTC, GO to Pinpoint Test K. Test K: An Individual Front Display Interface Module (FDIM) Display Is Inoperative/Does Not Operate Correctly

This pinpoint test is intended to diagnose the following:
- Subscription status
- Wiring, terminals or connectors
- Satellite radio receiver
- Audio unit

L1-L6:

L6-L9: