Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Pinpoint Test Z: U1000:00
- Refer to Wiring Diagrams MANUAL CLIMATE CONTROL SYSTEM
for schematic and connector information.
Normal Operation and Fault Conditions
Field-Effect Transistor (FET), REFER to: Climate Control System - System Operation and Component Description .
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition HVAC U1000:00 Solid State Driver Protection Active -Driver Disabled: No Sub Type Information This DTC sets in the HVAC control module Field-Effect Transistor (FET) protective circuit strategy for its actuator outputs has reached 1/3, 2/3 or 3/3 maximum. Possible Sources
- Vehicle communication bus
- Incomplete or improper PMI procedures
- HVAC control module
- Z1 RECHECK THE (HVAC) HEATING, VENTILATION AND AIR CONDITIONING CONTROL MODULE DIAGNOSTIC TROUBLE CODES (DTCS)NOTE: If new modules were installed prior to the Diagnostic Trouble Code (DTC) being set, the module configuration may be incorrectly set during the Programmable Module Installation (PMI) or the Programmable Module Installation (PMI) may not have been carried out.
- Using a diagnostic scan tool, clear the Diagnostic Trouble Codes (DTCs).
- Ignition OFF.
- Ignition ON.
- Wait 10 seconds.
- Using a diagnostic scan tool, carry out the HVAC control module self-test.
Is U1000:00 present?
Yes For DTC U1000:00, REPAIR all HVAC control module Non Communication Diagnostic Trouble Codes first, then CLEAR all Diagnostic Trouble Codes (DTCs). CARRY OUT the HVAC control module self-test. TEST for normal operations. No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.