Test E: The Electronic Automatic Temperature Control (EATC) Module Does Not Respond to the Scan Tool

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

E1:

E1-E2:

E3-E4:

Normal Operation
The EATC module communicates with the scan tool through the UBP communication network. Circuit 693 (OG) provides the network connection to the EATC module. The EATC module shares the UBP network with the vehicle security module and the instrument cluster. Voltage for the EATC module is provided by circuits 22 (LB/BK) and 296 (WH/VT). Circuit 676 (PK/OG) provides ground.

Possible Causes
- Fuse
- Circuit 22 (LB/BK) open
- Circuit 296 (WH/VT) open
- Circuit 676 (PK/OG) open
- Circuit 693 (OG) open
- EATC module