Test L: The THX(R) Amplifier Does Not Respond To The Scan Tool

PINPOINT TEST L: THE THX(R) AMPLIFIER DOES NOT RESPOND TO THE SCAN TOOL

L1:

L1-L3:

L3-L4:

Normal Operation
The THX(R) amplifier 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 THX(R) amplifier. The THX(R) amplifier 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 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 (if equipped), the parking aid module (if equipped), the power liftgate module (if equipped) and the climate controlled seat module (if equipped). Voltage for the THX(R) amplifier is provided by circuits SBP38 (BN/RD) and SBP40 (VT/RD). Three circuits GD114 (BK/BU) provide ground.

Possible Causes
- Fuse
- Circuit GD114 (BK/BU) open
- Circuit SBP38 (BN/RD) open
- Circuit SBP40 (VT/RD) open
- Circuit VDB06 (GY/OG) open (MS-CAN +)
- Circuit VDB07 (VT/OG) open (MS-CAN -)
- Audio unit