Pinpoint Test S : U3003:16, U3003:17: Notes
WARNING: This page is about a different car, the 2017 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
Refer to Automatic Climate Control System for schematic and connector information.
Normal Operation and Fault Conditions
The HVAC control module requires an operating voltage that is between 10 and 17 volts. The HVAC control module receives this voltage from the BJB. The HVAC control module has a single ground circuit located in the engine compartment wiring harness. Excessive resistance or an open in one or more of these circuits, a discharged battery, and overcharging condition or a inoperative charging system results in the HVAC control module setting a DTC.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| U3003:16 | Control Module Input Power "A": Circuit Voltage Below Threshold | This DTC sets when the HVAC control module senses lower than expected system voltage. |
| U3003:17 | Control Module Input Power "A": Circuit Voltage Above Threshold | This DTC sets when the HVAC control module senses greater than expected system voltage. This DTC may also set in the HVAC control module due to battery charging or vehicle jump starting events. |
Possible Causes
- Fuses
- Wiring, terminals or connectors
- Charging system concern
- Battery
- HVAC control module
Visual Inspection and Diagnostic Pre-checks
- Make sure the vehicle battery terminals and cables are free of any corrosion and other contaminants.
- Make sure the vehicle battery terminals are tightened to their correct torque specifications.
- Make sure BCM fuse 71 (10A) is OK.
- Inspect for loose or corroded HVAC control module connections.