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Self-tests 2026 firmware

Left Headlamp Communication Self-Test

Coriander/tasks/TEST-SELF_VCBATT_L_HCM

Model S / X (2021+)

What this task does

Tests the communication of the left headlamp module with the VCBATT ECU.

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 (2021+) AMD · Firmware 2026.20.6.1
Vehicle coverage
2021+ Model S, 2021+ Model X
Supported connection
Local connection
Vehicle state
Stationary · Drive; Stationary · Neutral; Stationary · Parked; Stationary · Reverse
Gateway diagnostic level
No specific level listed

Task inputs (0)

No user inputs are listed in this firmware.

Related service tasks

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Service procedures

12 Volt Battery Reset

Power cycles all of the eFuses on the VCFRONT and VCBATT ECUs and shuts off Sleep Bypass.

PROC_VCBATT_X_12V-RESET

Model S / X (2021+)
Service procedures

Clear left headlamp latched faults in factory

Clear all left headlamp factory latched faults that were triggering leftHeadlampFactoryFault alert

PROC_VCBATT_X_CLEAR-LEFT-HEADLAMP-LATCHED-FACTORY-FAULTS

Model S / X (2021+)
Service procedures

LVBMS Reconnect LV Battery

Reconnects the Low Voltage Battery MOSFET on Model S and X platforms.

PROC_VCBATT_X_RECONNECT-LV-BATTERY

Model S / X (2021+)