U0476

Code

Generic U — Network/User

Invalid Data Received From Restraints System Sensor F

Brand: Generic

Type: U — Network/User

Views: UK: 26 EN: 34 RU: 22

AI status

Completed

ready

Completed 100%

Page language: EN

Failed Restraints System Sensor F (internal fault)
Corroded, loose or damaged connector at the sensor
Broken, shorted or intermittent wiring between sensor and restraints control module
Loss of sensor reference voltage or ground (open/low supply)
CAN/LIN bus errors or network interference affecting message integrity
Faulty restraints control module (RCM/SRS module) or other module misinterpreting data

Airbag / SRS warning lamp illuminated
Related restraints features disabled or put in a fault-safe state (e.g., belt pretensioners)
Stored U0476 and possibly other network/communication DTCs
Chimes or occupant classification faults (if applicable)
Inconsistent or missing live data for Restraints Sensor F on a scan tool

Read and record all stored codes and freeze frame data with a capable scan tool
Check for related network codes (other U-codes) and multiple module faults
Inspect physical connector at Restraints Sensor F for corrosion, bent pins, or poor mating
Visually inspect wiring harness from sensor to restraints control module for damage, pinches, or repairs
Backprobe the sensor connector and monitor reference voltage, signal, and ground with ignition on
Monitor live data stream for sensor values, message rates and communication dropouts

CAN message ID and payload vary by vehicle; expected periodic message from Restraints module (example: 0x7xx) containing sensor data
Typical message period: 5–20 Hz (manufacturer-specific)
DLC (data length): commonly 8 bytes; sensor value often 1 byte (0–255) or 2 bytes
Expected sensor value range: manufacturer-defined (often 0 = open/invalid, valid operational range non-zero)
Reference/supply: typically 5 V or vehicle battery switched supply; measure expected voltage vs. ground
Ground continuity: low resistance to chassis ground; intermittent/ high resistance causes corrupted data

Safety first: follow SRS safety procedures — disable battery and wait manufacturer-specified time before servicing restraint circuits.
Use a diagnostic scan tool to read all codes and freeze frame data; note any additional U- or B-codes.
Clear codes, then re-run to see if U0476 returns and capture when/under what conditions it sets.
Inspect the sensor connector and wiring for damage, corrosion, or poor repair work; repair as needed.
With ignition ON (and SRS safety observed), backprobe sensor connector: verify sensor reference voltage, signal voltage, and ground continuity against expected values.
Monitor live data for the restraints sensor message on the network; confirm message ID, frequency, and that the payload value changes plausibly.
Wiggle harness and connectors while watching live data and codes to find intermittent faults.
Check CAN/LIN bus integrity: measure bus voltages, termination, and look for error frames with a scope or qualified scan tool.
If wiring and connectors are good, replace the sensor (if serviceable) and recheck.
If replacement sensor does not clear the fault, consider module fault: verify grounds and power to restraints control module and reflash or replace module only after confirming wiring/sensor are good.
After repairs, clear codes and perform a road or system test to ensure the code does not return and restraints system operates normally.