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Service procedures 2026 firmware

Start Thermal System Test

ModelSX/tasks/PROC_THC_X_THERMAL-TEST-START

What this task does

Start thermal system test. It proceeds for 5 minutes.

Vehicle & firmware coverage

Open a version to see its description, requirements, and input definitions. Hardware configuration and live vehicle checks also determine availability.

Model S / X (legacy) Legacy infotainment · Firmware 2026.14.6
Vehicle coverage
Pre-2021 Model S, Pre-2021 Model X
Supported connection
Local connection
Vehicle state
Stationary · Neutral; Stationary · Parked
Gateway diagnostic level
Factory, Service

Task inputs (2)

precondition

precondition · Bool

Firmware default: false

timeout_sec

timeout_sec · Float

Firmware default: 120

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Service procedures

Coolant Air Purge

Powers the accessory rail and runs HVAC pumps at maximum speed, changing the valve positions. Estimated time to complete is 20 minutes. To exit the routine early, run this routine again with STOP as the input.

PROC_THC_X_COOLANT-AIR-PURGE

Model S / X (legacy)
Service procedures

Louver Calibration

Runs the ModelS front louver calibration after actuator replacement. And returns the calibration status of all four louvers.

PROC_THC_X_LOUVER-CALIBRATION

Model S / X (legacy)
Service procedures

Start Thermal System Test with Precondition

Start thermal system test with precondition. It preconditions if needed, and then proceeds for 5 minutes to run thermal system test.

PROC_THC_X_THERMAL-TEST-START-PRECONDITION

Model S / X (legacy)
Communication checks

THC CAN Communication

Tests communication with the Thermal Controller for Supercharger (THC) Electronic Control Unit (ECU). Communication is established via Unified Diagnostics Services (UDS) over the Controller Area Network (CAN).

PING-TP_THC

Model S / X (legacy)