Test J: The Electronic Automatic Temperature Control (EATC) Module Does Not Respond To The Scan Tool

PINPOINT TEST J: THE ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) MODULE DOES NOT RESPOND TO THE SCAN TOOL

J1-J2:

J2-J3:

J4:

Normal Operation
The EATC module 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 EATC module. The EATC module shares the MS-CAN network with the instrument cluster, the smart junction box (SJB), the audio unit, 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 EATC module is provided by circuits CBP37 (WH) and SBP15 (WH/RD). Circuit GD115 (BK/GY) provides ground.

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