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

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

K1:

K1-K3:

K3-K4:

Normal Operation
The audio unit communicates with the scan tool through the medium speed controller area network (MS-CAN). Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the audio unit. The audio unit shares the MS-CAN network with the instrument cluster, the smart junction box (SJB), the electronic automatic temperature control (EATC) module (if equipped), the THX(R) amplifier (if equipped), the satellite radio receiver (if equipped), the digital versatile disc (DVD) player, the driver seat module (DSM) (if equipped), the parking aid module (if equipped), the power liftgate module and the climate controlled seat module (if equipped). Voltage for the audio unit is provided by circuits CBP28 (GY/VT), CBP41 (BU) and SBP39 (WH/RD). Circuit GD114 (BK/BU) provides ground.

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Audio unit