Normal Operation
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
Under normal operation, the HVAC module receives a ground through circuit GD116 (BK/VT). The HVAC module is supplied constant battery voltage through circuit SBP15 (WH/RD).
- DTC U3003:16 (Control Module Input Power "A": Circuit Voltage Below Threshold) - The module senses when battery voltage is greater than 16 volts.
- DTC U3003:17 (Control Module Input Power "A": Circuit Voltage Above Threshold) - The module senses when battery voltage is less than 9 volts.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- HVAC module