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

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, smart junction box (SJB), electronic automatic temperature control (EATC) or electronic manual temperature control (EMTC) module, satellite radio receiver, front control interface module (FCIM) and front display interface module (FDIM). Voltage for the audio unit is provided by circuit SBP39 (WH/RD). Ground is provided by circuit GD115 (BK/GY).

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

K1-K2:

K2-K4: