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Home / DTC / U0196 — Lost Communication With Rear Seat Entertainment Control Module

U0196 — Lost Communication With Rear Seat Entertainment Control Module

Detailed page for trouble code U0196.

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Code

U0196

HYUNDAI U — Network/User

Lost Communication With Rear Seat Entertainment Control Module

Brand: HYUNDAI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • RSE control module powered down, asleep, or failed
  • Blown fuse or loss of power/ground to RSE module
  • Damaged or corroded connector/pinning at RSE module
  • Broken, shorted, or intermittent CAN/LIN wiring between RSE and network
  • Faulty termination or bus short (CANH/CANL shorted to each other, battery, or ground)
  • Faulty gateway/BCM or other intermediate module routing communications

Symptoms

  • Rear seat entertainment (video, screens, media playback) inoperative or intermittent
  • Error or warning message on infotainment or instrument cluster indicating RSE fault
  • No response from RSE when using controls (touchscreen, rear seat remote)
  • Related features (rear audio, USB/HDMI ports) not working
  • Possible parasitic battery drain if module stuck in active state

What to check

  • Read all U-codes and history with a full OEM-capable scan tool; note status (current/ intermittent/confirmed)
  • Check fuses and relays supplying the RSE module (engine off & key on states)
  • Visually inspect connector at RSE module for corrosion, bent pins, or water ingress
  • Wiggle-test wiring harness while scanning for changes in communication status
  • Check for other lost-communication codes (gateway, BCM, cluster) to identify network-wide issue
  • Measure supply voltage and ground at module connector (battery + and chassis ground)

Signal parameters

  • CAN bus idle voltages: CANH ≈ 2.5 V, CANL ≈ 2.5 V (differential ~0 V idle); typical HS-CAN nominal 500 kbps on many Hyundai models
  • Dominant CAN state: CANH ~3.5 V, CANL ~1.5 V during activity (verify with oscilloscope)
  • Module should respond to diagnostic request (UDS/ISO-TP) when probed with OEM scan tool
  • Resistance across CANH and CANL should be ~60 Ω (with ignition OFF and main connectors connected) indicating proper termination
  • Supply voltage at RSE: near battery voltage when switched/powered (check per model wiring)

Diagnostic algorithm

  1. Verify the code: connect OEM-capable scan tool, record U0196 status (current/intermittent/history) and any related U-codes.
  2. Confirm power & ground: with connector connected, measure +12V supply and ground at RSE pins with ignition ON; check fuses feeding that circuit.
  3. Inspect connectors/harness: remove RSE connector, inspect pins for corrosion, bent pins, or water damage; repair as needed.
  4. Check network activity: use a scan tool or oscilloscope on CANH/CANL at the RSE connector. Look for valid CAN frames and correct voltage levels.
  5. Isolate the bus: if CAN shows no activity, disconnect the RSE module and monitor whether the rest of the bus regains normal communication; this can identify a shorted/faulty node.
  6. Check termination and wiring: measure resistance across CANH/CANL (approx. 60 Ω with both terminations present). Inspect wiring to gateway/BCM and for physical damage.
  7. Check gateway/BCM communication: verify other modules can communicate and that the gateway is forwarding messages. Test communication to RSE using OEM diagnostic functions.
  8. Eliminate aftermarket causes: disconnect aftermarket accessories that may be spliced into rear circuits and retest.
  9. Module bench test or replacement: only replace the RSE module after verifying power, ground, correct bus activity, and that disconnecting the module does not restore correct network function elsewhere.
  10. Clear codes and retest: after repair, clear DTCs, perform functional test of rear entertainment functions, and verify no return of U0196 during extended test drive.

Likely causes

  • Loose or corroded connector at the RSE unit
  • No 12 V constant or switched supply to RSE (blown fuse or open circuit)
  • Open or shorted CAN bus wiring to rear of vehicle (pinched harness in door or seat)
  • Failed RSE control module (internal electronics fault)
  • Faulty ground at chassis common ground near seat/module
  • Gateway/BCM not forwarding messages due to its own fault or software issue

Fault status

⚠️ Status
Lost communication with Rear Seat Entertainment control module — module not responding on vehicle data bus.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

U0100 U0121 U0140 U0073 U0155
371

Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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