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Diagnostic tests 2026 firmware

Left Signal Light Status

ModelS/tasks/TEST_VCFRONT_L_SIGNAL-LIGHT

Model S / X (legacy)

What this task does

Check that the left signal light is working correctly.

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
Supported connection
Local connection
Vehicle state
Stationary · Parked
Gateway diagnostic level
No specific level listed

Task inputs (0)

No user inputs are listed in this firmware.

Related service tasks

Browse all tasks →
Service procedures

Check Left Turn Signal Functionality

Checks whether the left turn signal indicator light is on and functioning as expected. This routine monitors CAN to confirm whether the indicator light is turned on.

PROC_VCFRONT_L_SIGNAL-LIGHT-LEFT

Model S / X (legacy)
Service procedures

Check Right Turn Signal Functionality

Checks whether the right turn signal indicator light is on and functioning as expected. This routine monitors CAN to confirm whether the indicator light is turned on.

PROC_VCFRONT_R_SIGNAL-LIGHT-RIGHT

Model S / X (legacy)
Diagnostic tests

Right Signal Light Status

Check that the right signal light is working correctly.

TEST_VCFRONT_R_SIGNAL-LIGHT

Model S / X (legacy)