B281100

Code

HYUNDAI B — Body

Timeout Multimedia CAN Message (RSE_R)

Brand: HYUNDAI

Type: B — Body

Views: UK: 12 EN: 8 RU: 11

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or shorted CAN wiring (CAN_H / CAN_L) between the multimedia network and the RSE module
Poor connector contacts, corrosion, or damaged pins at RSE or intermediate connectors
Loss of power or ground to the RSE module or related infotainment modules
Faulty RSE module or other multimedia module that transmits the message
CAN bus termination missing or incorrect (open/miswired termination resistor)
Bus-off or heavy CAN traffic/errors preventing normal message transmission

Symptoms

Rear seat entertainment (screen/audio) not working or intermittent
Multimedia functions unavailable for rear seats; playback or controls unresponsive
Infotainment warnings or communication-related messages on display
Possible multiple communication-related DTCs present on scan tool
Other modules on same CAN network may show communication faults

What to check

Read and record all DTCs and freeze frame data from infotainment and body modules
Verify ignition/power and ground at the RSE module connector with a DVOM
Visually inspect RSE connector, wiring harness, and intermediate connectors for damage, corrosion, or water ingress
Measure DC voltage on CAN_H and CAN_L with ignition ON (approx. 2.5 V each; see signal checks)
Measure resistance between CAN_H and CAN_L with ignition OFF (approx. 60 Ω typical for two 120 Ω terminators)
Check for bus-off status or error counters via scan tool or module data

Signal parameters

CAN bus idle (recessive) voltage: ~2.5 V on CAN_H and CAN_L (refer to vehicle spec)
Dominant state differential: typically ~2.0 V difference (example CAN_H ~3.5 V, CAN_L ~1.5 V)
Termination resistance (CAN_H to CAN_L): ~60 Ω (two 120 Ω terminators in parallel) — verify vehicle-specific value
Typical data rates on multimedia/infotainment CAN: commonly 250–500 kbps (confirm with service documentation)
Expected message periodicity: varies by message (from ~10 ms for fast signals to 100–1000 ms for status messages); timeout indicates expected message not received within configured window

Diagnostic algorithm

Connect a manufacturer-grade scan tool. Read and log B281100 and any other communication or module DTCs from infotainment, body, and related modules.
Note freeze frame data and capture which module reports the timeout (RSE_R). Verify vehicle battery voltage is within specification.
Visually inspect RSE module connectors and harness routing for damage or moisture. Repair any obvious wiring damage before further testing.
With ignition ON, verify module power and ground pins at the RSE connector. Replace or repair supply/ground faults.
Check CAN bus voltages at the RSE connector with a DVOM: both lines should read near 2.5 V. If voltages are abnormal, trace wiring for short to Vb/chassis or open circuits.
With ignition OFF, measure resistance between CAN_H and CAN_L at the harness to verify proper termination (approx. 60 Ω).
Use an oscilloscope or CAN bus monitor to observe waveform integrity and confirm whether the expected multimedia messages are present. Look for bus noise, dominant/recessive transitions, and message IDs.
If a noisy or dominant device is found, isolate by disconnecting suspect modules one at a time (starting with RSE) to see if the bus recovers and messages resume.
If another module is not transmitting the expected message, inspect that module and its power/ground/wiring. Reprogram or update module software if recommended by TSB/service bulletin.
If wiring and other modules check good and RSE does not see the message, consider replacing or reprogramming the RSE module. After any repair, clear DTCs and verify proper operation and that the timeout does not return.

Likely causes

Disconnected/loose connector at the RSE module or nearby junction
Damaged CAN pair (abraded, chafed, or short to chassis/voltage) in harness
Failed RSE module transmitter or companion infotainment module not sending messages
Lost power/ignition feed or poor ground at the RSE module
ECU in bus-off state due to repeated errors (one module flooding the bus)

Fault status

⚠️ Status

Multimedia CAN message timeout detected by rear seat entertainment module — expected periodic CAN message not received within configured timeout interval.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 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