Explorer 4WD V8-4.6L (2008)
H4-H5
Test I: The Heating Ventilation Air Conditioning (HVAC) Module Does Not Respond To The Scan
Tool
PINPOINT TEST I: THE HEATING VENTILATION AIR CONDITIONING (HVAC) MODULE DOES NOT RESPOND TO THE SCAN
TOOL
Normal Operation
The heating ventilation air conditioning (HVAC) 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 HVAC module. The
HVAC module shares the MS-CAN with the instrument cluster (IC), the smart junction box (SJB), the audio control module (ACM), the satellite
digital audio receiver system (SDARS) module (if equipped), the rear entertainment module (RETM) (if equipped), the driver seat module (DSM) (if
equipped), the power running board (PRB) module (if equipped) and the parking aid module (PAM) (if equipped). Voltage for the HVAC module is
provided by circuits CBP20 (YE/VT) and SBP28 (GN/RD). Circuit GD145 (BK/BU) provides ground.
This pinpoint test is intended to diagnose the following:
-
Fuse
-
Wiring, terminals or connectors