Test E: The HVAC Module Does Not Respond To The Scan Tool

PINPOINT TEST E: THE HVAC MODULE DOES NOT RESPOND TO THE SCAN TOOL

Normal Operation
The HVAC module communicates with the scan tool through the standard corporate protocol (SCP) communication network. Circuits 914 (TN/OG) (SCP +) and 915 (PK/LB) (SCP-) provide the network connection to the HVAC module. The HVAC shares the SCP network with the lighting control module (LCM), the rear audio and temperature control (RATC) module (if equipped), the driver door module (DDM), the driver seat module (DSM) (if equipped) and the instrument cluster (IC). Voltage for the HVAC module is provided by circuits 1812 (BN/WH) and 1566 (RD/YE). Circuit 57 (BK) provides ground.

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

E1:

E1-E2:

E3-E4: