Test G: The Instrument Cluster Does Not Respond To The Scan Tool

PINPOINT TEST G: THE INSTRUMENT CLUSTER DOES NOT RESPOND TO THE SCAN TOOL

G1:

G1-G3:

G4-G5:

Normal Operation
The instrument cluster communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the HS-CAN network connection to the instrument cluster and circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the MS-CAN network connection to the instrument cluster. The instrument cluster shares the HS-CAN network with the powertrain control module (PCM), the transmission control module (TCM), the anti-lock brake system (ABS) module, the restraints control module (RCM), the four wheel drive (4WD) control module (if equipped) and the air suspension module (if equipped). The instrument cluster shares the MS-CAN network with 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 driver seat module (DSM) (if equipped), the climate controlled seat module (if equipped), the power liftgate module (if equipped), the parking aid module (if equipped), the power running board module (if equipped), the auxiliary audio module and the digital versatile disc (DVD) player. Voltage for the instrument cluster is provided by circuits CBP29 (WH/VT) and SBP26 (YE/RD). Circuit GD133 (BK) provides ground.

DTC U0155 - sets in a module which had attempted to communicate with the instrument cluster and failed.

Possible Causes
- Fuse
- Circuit CBP29 (WH/VT) open
- Circuit GD133 (BK) open
- Circuit SBP26 (YE/RD) open
- Circuit VDB04 (WH/BU) open (HS-CAN +)
- Circuit VDB05 (WH) open (HS-CAN -)
- Instrument cluster