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-K2:

K2-K3:

K4:

Normal Operation
There are 2 types of audio units used on this vehicle, the base audio unit (Audiophile) and the THX(R) audio unit (if equipped). Both audio units communicate with the scan tool through the medium speed controller area network (CAN), circuits VDB06 (GY/OG) and VDB07 (VT/OG).

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 manual temperature control module (if equipped), the electronic automatic temperature control (EATC) module (if equipped), the audio unit, the THX(R) amplifier (if equipped), the satellite radio receiver (if equipped), the auxiliary audio module, the digital versatile disc (DVD) player, the driver seat module (DSM) (if equipped), the power running board module, 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 circuit SBP39 (WH/RD). Circuit GD114 (BK/BU) provides ground.

Possible Causes
- Fuse
- Circuit GD114 (BK/BU) open
- Circuit SBP39 (WH/RD) open
- Circuit VDB06 (GY/OG) open (MS-CAN +)
- Circuit VDB07 (VT/OG) open (MS-CAN -)
- THX(R) amplifier