Code
C153212
HYUNDAI
C — Chassis
LKAS Switch Failure
Views:
UK: 13
EN: 19
RU: 10
AI status
Completed
Completed
100%
Causes
- Faulty LKAS switch (steering wheel or column-mounted switch)
- Loose, corroded or damaged connector at the switch
- Open/short in switch wiring harness
- Clockspring damage or poor contact (steering wheel wiring)
- Loss of power or ground to the switch circuit
- CAN bus or LIN communication fault between switch and ADAS/BCM module
Symptoms
- LKAS cannot be enabled or turns off immediately after enabling
- LKAS warning or indicator lamp/message on instrument cluster
- Steering wheel LKAS switch feels unresponsive or inconsistent
- Related ADAS functions (lane warnings) not available
- DTC stored in ADAS/BCM diagnostic memory
What to check
- Retrieve and record all stored DTCs and freeze-frame data with a capable scan tool
- Check instrument cluster/BCM messages for LKAS-related warnings
- Visually inspect switch, connector, and wiring for damage, corrosion, or loose pins
- Verify fuses and power/ground at the switch connector
- Confirm clockspring condition and continuity of steering wheel switch circuits
- Use scan tool to monitor switch state and CAN/LIN messages while operating the switch
Signal parameters
- Supply voltage at switch connector: ~9–14 V with ignition ON (verify per vehicle spec)
- Ground continuity from switch to chassis ground
- Switch output: open/closed contact or low/high logic level depending on design (verify with live data)
- Presence of expected CAN/LIN messages from steering wheel module or switch when operated
- No short to battery or ground on switch signal lines (check resistance/continuity)
Diagnostic algorithm
- Connect a diagnostic scanner that supports Hyundai ADAS modules. Read and record codes and freeze-frame data.
- Attempt to reproduce the fault: operate the LKAS switch while monitoring live data for switch input and LKAS status.
- Inspect the switch assembly and connector for physical damage, corrosion, or bent pins. Repair or clean as needed.
- Verify power and ground at the switch connector with ignition ON. Replace blown fuses if found.
- Check continuity of the switch circuit back to the ADAS/BCM connector and through the clockspring if steering wheel mounted. Repair wiring faults.
- If clockspring is suspected (symptoms include other steering wheel button failures or airbag faults), remove steering column covers and test/replace clockspring per service procedure.
- Use an oscilloscope or capable scan tool to confirm CAN/LIN messages and signal integrity while operating the switch. Investigate any bus errors or missing messages.
- Swap in a known-good LKAS switch or perform bench test if available to confirm switch vs. wiring/module fault.
- If wiring and switch verify OK, follow manufacturer diagnostic flow for ADAS/BCM: check connectors at control module, reflash/update software, and consider module replacement as a last resort.
- Clear codes and verify repair by cycling ignition and road-testing to ensure no recurrence.
Likely causes
- Faulty or worn LKAS switch
- Poor connector/terminal contact at the switch or clockspring
- Clockspring damage causing intermittent contact to buttons
- CAN/LIN communication interruption (loose connector or wiring)
- Blown fuse or missing power/ground to switch circuit
Fault status
Status
LKAS Switch Failure — LKAS switch not detected or not communicating; LKAS may be disabled.
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