Test E: The Audio Unit Does Not Respond To The Scan Tool

PINPOINT TEST E: THE AUDIO UNIT DOES NOT RESPOND TO THE SCAN TOOL

E1-E2:

E2-E3:

E4:

Normal Operation
The audio unit communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits 1847 (WH/OG) (MS-CAN +) and 1848 (PK/OG) (MS-CAN -) provide the network connection to the audio unit. The audio unit shares the MS-CAN network with the smart junction box (SJB), the satellite radio receiver (if equipped), and the instrument cluster. Voltage for the audio unit is provided by circuits 687 (GY/YE) and 729 (RD/WH). Circuit 1204 (BK/OG) provides ground.

DTC U0184 - sets when there is a loss of communication with the audio unit.

Possible Causes
- Fuse
- Circuit 687 (GY/YE) open
- Circuit 729 (RD/WH) open
- Circuit 1204 (BK/OG) open
- Circuit 1847 (WH/OG) open (MS-CAN +)
- Circuit 1848 (PK/OG) open (MS-CAN -)
- Audio unit