Test N: The Electronic Automatic Temperature Control (EATC) Or Electronic Manual Temperature Control (EMTC) Module Does Not Res

PINPOINT TEST N: THE ELECTRONIC AUTOMATIC TEMPERATURE CONTROL (EATC) OR ELECTRONIC MANUAL TEMPERATURE CONTROL (EMTC) MODULE DOES NOT RESPOND TO THE SCAN TOOL

Normal Operation
The EATC/EMTC 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/EMTC module. The EATC/EMTC module shares the MS-CAN network with the smart junction box (SJB), the audio unit, the driver seat module (DSM), the digital versatile disc (DVD) player, the satellite radio receiver, the power liftgate module and the instrument cluster. Voltage for the EATC/EMTC module is provided by circuits CBP37 (WH) and SBP15 (WH/RD). Circuit GD111 (BK/BU) provides ground.

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

N1:

N1-N2:

N3-N4: