Skip to content
Service procedures 2026 firmware

Fuse Modem

Common/tasks/PROC_SEC_X_FUSE-MODEM

Model 3 / YModel S / X (legacy)Model S / X (2021+)

What this task does

The procedure fuses only the modem board when the other components are already fused. This is useful for modem replacements that were not fused in the factory. Production components should always be fused.

Vehicle & firmware coverage

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

Model 3 / Y AMD · Firmware 2026.32.3
Vehicle coverage
2024+ Model 3, 2025+ Model Y, Model Y, Pre-2024 Model 3
Supported connection
Local connection
Vehicle state
Stationary · Parked
Gateway diagnostic level
No specific level listed

Procedure notes

Fusing is irreversible. Modem will restart.

Task inputs (2)

retry_count

retry_count · Int

Firmware default: 1

retry_delay

retry_delay · Float

Firmware default: 10

Model 3 / Y Intel · Firmware 2026.32.7
Vehicle coverage
Model Y, Pre-2024 Model 3
Supported connection
Local connection
Vehicle state
Stationary · Parked
Gateway diagnostic level
No specific level listed

Procedure notes

Fusing is irreversible. Modem will restart.

Task inputs (2)

retry_count

retry_count · Int

Firmware default: 1

retry_delay

retry_delay · Float

Firmware default: 10

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 · Parked
Gateway diagnostic level
No specific level listed

Procedure notes

Fusing is irreversible. Modem will restart.

Task inputs (2)

retry_count

retry_count · Int

Firmware default: 1

retry_delay

retry_delay · Float

Firmware default: 10

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 · Parked
Gateway diagnostic level
No specific level listed

Procedure notes

Fusing is irreversible. Modem will restart.

Task inputs (2)

retry_count

retry_count · Int

Firmware default: 1

retry_delay

retry_delay · Float

Firmware default: 10

Related service tasks

Browse all tasks →
Diagnostic tests

Key Range Test

This test checks the RKE antenna system function and quality in Model S vehicles. The test can be performed with any Model S key fob or RF emitter, provided it is the same frequency region as the vehicle. The test will pass when the security controller (SEC) detects a RSSI value between 380 and 500. As the user presses key fob buttons, the SEC records the received signal strength from the RKE antenna.

TEST_SEC_X_KEY-RANGE

Model S / X (legacy)
Diagnostic tests

LF Antenna Diagnosis (SEC)

Runs a ping test on all 7 LF antennas. The low frequency (LF) antennas are used on the Model S to detect the position\nof the key fob in and around the vehicle. This test checks to make sure the\nspecified antenna is connected and responsive. This includes: - Center Console - Rear Seat - Rear Bumper - Dead Key Fob - Driver's Side End Cap - Passenger's Side End Cap - Frunk The routine will pass if all antennas return success. The failed output will include any antennas which failed to ping.

TEST_SEC_X_ANTEN-LF-DIAGNOSIS

Model S / X (legacy)
Communication checks

SEC CAN Communication

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

PING-TP_SEC

Model S / X (legacy)