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Home / DTC / B2811 — No Response NM Message (RSE_R)

B2811 — No Response NM Message (RSE_R)

Detailed page for trouble code B2811.

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Code

B2811

HYUNDAI B — Body

No Response NM Message (RSE_R)

Brand: HYUNDAI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • RSE_R module powered down or internal failure
  • Open/short in power or ground feed to RSE_R
  • Faulty connector or corrosion at RSE_R wiring harness
  • Broken or shorted CAN bus wiring (CAN_H / CAN_L) or poor termination
  • Blown fuse supplying RSE_R or related bus
  • Intermittent battery/voltage supply or low system voltage

Symptoms

  • Rear seat entertainment functions (right side) nonfunctional or intermittent
  • No communication with RSE_R using scan tool
  • Related features (audio routing, screens, USB/HDMI) not available
  • One or more related modules report CAN bus errors or additional communication DTCs
  • Possible warning messages on cluster or infotainment

What to check

  • Scan system with OEM scan tool (GDS/IDS) to confirm B2811 and read live data/messages
  • Check battery voltage (should be ~12.4–12.8 V with key off; >12 V with key on) and charging system
  • Inspect fuse(s) for RSE_R and related circuits
  • Visual inspection of RSE_R connector and harness for corrosion, damage, disengagement
  • Attempt communication with RSE_R module via diagnostic tool
  • Measure CAN_H/CAN_L voltages at RSE_R connector with ignition ON

Signal parameters

  • Message: Network Management (NM) alive/message from RSE_R
  • Expected behavior: periodic 'alive' NM message at the bus (varies by vehicle; commonly 100 ms–1000 ms intervals)
  • Physical bus: CAN_H/CAN_L idle ~2.5 V (recessive), dominant differential when active
  • Termination: ~60 ohm across CAN_H and CAN_L (two 120 ohm terminators in parallel)
  • Common failure modes: stuck dominant, no differential, missing periodic NM frame

Diagnostic algorithm

  1. Retrieve DTCs with OEM scanner and note any additional U- or B-codes. Do not clear codes yet.
  2. Confirm you cannot communicate with RSE_R using the scan tool. Record module presence/absence and any live data.
  3. Inspect RSE_R connector and wiring for corrosion, bent pins, water intrusion, or physical damage. Re-seat connector.
  4. Check related fuses and relays for continuity; replace any blown fuses and retest communication.
  5. With ignition ON, measure supply voltage and ground at the RSE_R power pins. Verify proper voltage and good ground. Repair wiring if out of range.
  6. Measure CAN_H and CAN_L voltages at the RSE_R connector with key ON: verify idle voltages (~2.5 V) and look for expected differential when other modules are active.
  7. With ignition OFF, measure resistance across CAN_H and CAN_L at a convenient connector: expect ~60 ohm. If open or very low, locate wiring fault or missing termination.
  8. Perform a wiggle test on the harness while watching for intermittent communication or DTCs. Isolate sections to locate intermittent breaks.
  9. If bus wiring appears good but module still not responding, disconnect other nonessential modules on the same bus one at a time to see if communication is restored (helps identify a faulting module dragging down the bus).
  10. Consult wiring diagrams to trace CAN and power/ground paths; repair any short/open or connector fault found.
  11. If wiring and power/ground are good and the module does not respond, consider reprogramming or replacement of the RSE_R module per OEM procedure. Follow immobilizer/anti-theft and module commissioning steps as required.
  12. After repair, clear codes, verify communication with scanner, and confirm RSE_R functions through a complete test/drive cycle.

Likely causes

  • Disconnected, corroded, or damaged connector at RSE_R
  • Loss of power/ground to the RSE_R module (fuse, wiring)
  • CAN bus wiring fault (open, short to battery/ground, missing termination)
  • RSE_R module failure

Fault status

⚠️ Status
No response to Network Management (NM) message from Rear Seat Entertainment - Right (RSE_R).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B2810 B2801 U0073 U0100 U0140
371

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