Code
U017D
Generic
U — Network/User
Lost Communication With Restraints System Sensor N
Views:
UK: 25
EN: 24
RU: 18
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between the sensor and network
- Poor or corroded connector at the sensor or harness splice
- Sensor (Restraints System Sensor N) hardware failure
- Loss of sensor power or ground (fuse, relay, wiring)
- CAN bus fault (missing termination, excessive load, short to battery/ground)
- Module or ECU software/firmware issue, or bus speed/format mismatch
Symptoms
- Airbag/SRS warning lamp illuminated
- Related restraint functions (airbags, pretensioners, occupant classification) disabled or inoperative
- Multiple network communication DTCs present
- Possible stored crash or event data if sensor sent corrupted data before loss
- Intermittent lamp illumination or module self-check faults
What to check
- Read all stored and pending DTCs and freeze frame data with a capable scan tool
- Check for recent crash event data before servicing restraints components
- Visually inspect connectors and wiring at the sensor N and nearby harness routing for damage or corrosion
- Verify sensor power and ground circuits (voltage with ignition ON, good ground continuity)
- Check fuses and relays related to the restraints system
- Verify CAN bus health: measure CANH/CANL voltages and check for proper termination resistance (~60 ohms across CANH/CANL)
Signal parameters
- Expected CAN bus idle voltages: CAN_H ~2.5 V, CAN_L ~2.5 V (differential ~0 V) with typical dominant level swing: CAN_H up ~3.5 V, CAN_L down ~1.5 V
- Termination resistance: approximately 60 ohms across CAN_H and CAN_L (two 120 ohm terminators in parallel)
- Sensor heartbeat/message frequency: typically a periodic message (example ranges 5–20 Hz) — verify exact ID/rate from manufacturer wiring data
- Message content: status and sensor data frames from Restraints Sensor N; absence or corrupted frames indicate comms loss
- Bus data rate: commonly 500 kb/s or 250 kb/s depending on vehicle — confirm with wiring/tech data
Diagnostic algorithm
- Retrieve and record all DTCs and freeze frame data; note occurrence count and related codes.
- Inspect the sensor N connector and harness visually for corrosion, bent pins, or physical damage. Repair as needed.
- With ignition ON (engine off), measure sensor supply voltage and ground continuity at the connector. Repair open circuits or bad grounds.
- Check fuses/relays that supply the restraints sensor; replace if blown and investigate cause.
- Use a scan tool to monitor the CAN bus for the sensor's message ID and message rate. If messages are absent, proceed to wiring checks.
- Measure CAN_H/CAN_L voltages at the sensor connector. Verify termination resistance across the two lines (~60 ohms).
- If bus voltages or termination are wrong, trace wiring for shorts/opens or external devices loading the bus. Repair wiring or remove offending loads.
- If wiring and bus look good at the connector, substitute a known-good sensor (if available) or bench test the sensor per manufacturer procedures.
- Use an oscilloscope or CAN bus analyzer to inspect waveforms for noise, collisions, or intermittent breaks while manipulating harness and connectors.
- After repairs, clear DTCs and perform a system self-test or road test to confirm permanent fix. Re-scan for reoccurrence.
- If unable to isolate, consult vehicle-specific wiring diagrams, module pinouts, and manufacturer technical service bulletins; consider replacing the affected control module only after ruling out wiring and sensor.
Likely causes
- Disconnected or corroded sensor connector
- Broken/damaged CAN wires near hinge points or inside harness
- Failed restraints sensor (internal fault)
- Blown fuse or open sensor power/ground circuit
- Short on CANH/CANL to battery or ground causing bus failure
Fault status
Status
Lost Communication With Restraints System Sensor N — messages from the restraints sensor node N are not being received or are invalid on the vehicle network.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop Manual199,00 UAH
Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop Manual199,00 UAH
AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop Manual199,00 UAH
Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop Manual199,00 UAH
Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop Manual199,00 UAH
Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop Manual199,00 UAH
Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop Manual199,00 UAH
Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop Manual199,00 UAH
LAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email
Code
U017D
HYUNDAI
U — Network/User
Lost Communication With “Restraints System Sensor N”
Views:
UK: 23
EN: 13
RU: 13
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring between the sensor and network
- Poor or corroded connector at the sensor or harness splice
- Sensor (Restraints System Sensor N) hardware failure
- Loss of sensor power or ground (fuse, relay, wiring)
- CAN bus fault (missing termination, excessive load, short to battery/ground)
- Module or ECU software/firmware issue, or bus speed/format mismatch
Symptoms
- Airbag/SRS warning lamp illuminated
- Related restraint functions (airbags, pretensioners, occupant classification) disabled or inoperative
- Multiple network communication DTCs present
- Possible stored crash or event data if sensor sent corrupted data before loss
- Intermittent lamp illumination or module self-check faults
What to check
- Read all stored and pending DTCs and freeze frame data with a capable scan tool
- Check for recent crash event data before servicing restraints components
- Visually inspect connectors and wiring at the sensor N and nearby harness routing for damage or corrosion
- Verify sensor power and ground circuits (voltage with ignition ON, good ground continuity)
- Check fuses and relays related to the restraints system
- Verify CAN bus health: measure CANH/CANL voltages and check for proper termination resistance (~60 ohms across CANH/CANL)
Signal parameters
- Expected CAN bus idle voltages: CAN_H ~2.5 V, CAN_L ~2.5 V (differential ~0 V) with typical dominant level swing: CAN_H up ~3.5 V, CAN_L down ~1.5 V
- Termination resistance: approximately 60 ohms across CAN_H and CAN_L (two 120 ohm terminators in parallel)
- Sensor heartbeat/message frequency: typically a periodic message (example ranges 5–20 Hz) — verify exact ID/rate from manufacturer wiring data
- Message content: status and sensor data frames from Restraints Sensor N; absence or corrupted frames indicate comms loss
- Bus data rate: commonly 500 kb/s or 250 kb/s depending on vehicle — confirm with wiring/tech data
Diagnostic algorithm
- Retrieve and record all DTCs and freeze frame data; note occurrence count and related codes.
- Inspect the sensor N connector and harness visually for corrosion, bent pins, or physical damage. Repair as needed.
- With ignition ON (engine off), measure sensor supply voltage and ground continuity at the connector. Repair open circuits or bad grounds.
- Check fuses/relays that supply the restraints sensor; replace if blown and investigate cause.
- Use a scan tool to monitor the CAN bus for the sensor's message ID and message rate. If messages are absent, proceed to wiring checks.
- Measure CAN_H/CAN_L voltages at the sensor connector. Verify termination resistance across the two lines (~60 ohms).
- If bus voltages or termination are wrong, trace wiring for shorts/opens or external devices loading the bus. Repair wiring or remove offending loads.
- If wiring and bus look good at the connector, substitute a known-good sensor (if available) or bench test the sensor per manufacturer procedures.
- Use an oscilloscope or CAN bus analyzer to inspect waveforms for noise, collisions, or intermittent breaks while manipulating harness and connectors.
- After repairs, clear DTCs and perform a system self-test or road test to confirm permanent fix. Re-scan for reoccurrence.
- If unable to isolate, consult vehicle-specific wiring diagrams, module pinouts, and manufacturer technical service bulletins; consider replacing the affected control module only after ruling out wiring and sensor.
Likely causes
- Disconnected or corroded sensor connector
- Broken/damaged CAN wires near hinge points or inside harness
- Failed restraints sensor (internal fault)
- Blown fuse or open sensor power/ground circuit
- Short on CANH/CANL to battery or ground causing bus failure
Fault status
Status
Lost Communication With Restraints System Sensor N — messages from the restraints sensor node N are not being received or are invalid on the vehicle network.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email