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 vehicle may be equipped with either a single-zone or dual-zone automatic HVAC module or a manual (non-HVAC) climate control system. This test diagnoses the HVAC module systems. Voltage for the HVAC module is provided by circuits CBP20 (YE/VT) and SBP07 (WH/RD). Circuit GD116 (BK/VT) provides ground.

The HVAC module shares the MS-CAN with the following modules:
- Accessory protocol interface module (APIM) (if equipped)
- Audio control module (ACM)
- Audio digital signal processing (DSP) module (if equipped)
- Driver seat module (DSM) (if equipped)
- Driver door module (DDM) (if equipped)
- Dual climate control seat module (DCSM) (if equipped)
- Instrument cluster (IC)
- Parking aid module (PAM) (if equipped)
- Satellite digital audio receiver system (SDARS) module (if equipped)
- Smart junction box (SJB)

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

I1:

I1-I2:

I3-I4: