U0192

Code

MERCEDES-BENZ U — Network/User

Lost Communication with Television

Brand: MERCEDES-BENZ

Type: U — Network/User

Views: UK: 16 EN: 27 RU: 22

AI status

Completed

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Page language: EN

Causes

Blown fuse or lost power to the television/head unit
Poor or missing ground connection at the television module
Damaged wiring, broken pins or corroded connectors between TV unit and network
Faulty television/head unit (internal failure)
CAN/MOST/optical bus interruption, open, short or missing termination
Faulty gateway module or other node causing bus bus-off condition

Symptoms

Television/multimedia display does not power on or shows "no signal"
Audio/video or navigation display missing or intermittent
Warning or fault message in instrument cluster or COMAND screen
Other modules report network communication errors or 'module missing'
Certain features tied to the TV unit (video, rear camera, apps) unavailable

What to check

Use a Mercedes diagnostic tool (Star Diagnosis/baseline scan) and read all U-codes and related faults
Confirm presence/absence of the TV module in module list (is it detected?)
Inspect fuses related to multimedia / infotainment and replace if blown
Visually inspect connectors at the TV/head unit and gateway for corrosion, bent pins or water ingress
Check for aftermarket devices (amplifiers, video interfaces) and disconnect for test
Measure supply voltage and ground at the TV module connector with ignition ON

Signal parameters

Accessory/ignition-switched supply: ~12 V (verify with multimeter)
Constant battery supply: ~12 V (if applicable for memory)
Ground continuity: near 0 ohms to chassis
CAN bus idle voltages: CAN_H ≈ 2.5 V (recessive) rising to ≈3.5 V when dominant; CAN_L ≈ 2.5 V (recessive) dropping to ≈1.5 V when dominant (measure relative to chassis)
Bus termination resistance: approx. 60 ohms between CAN_H and CAN_L
MOST/optical nodes: check optical connector cleanliness and MOST interface status in diagnostic tester (light level/status available in some tools)

Diagnostic algorithm

Connect factory-grade scan tool and record U0192 plus related U-codes and module presence. Note module addressing and software versions.
Confirm whether the TV module appears in the network module list. If module is absent, proceed to wiring/power checks.
Inspect and test fuses for infotainment/TV circuits; replace any blown fuses and retest.
Visually inspect connectors at the TV unit, gateway and any intermediate junctions; unplug and reseat connectors, inspect pins for corrosion or damage.
With harness disconnected, measure battery, switched power and ground at the TV module connector. Repair any missing supply or poor ground.
Check CAN/MOST/optical bus signals: measure CAN_H/CAN_L voltages and termination resistance; on MOST inspect optical connector and use diagnostic tool to view MOST status/errors.
If bus voltages are abnormal, trace wiring for short to power/ground or open circuit and repair as needed.
If power, ground and bus are correct but module is not responding, attempt a soft reset/power cycle then re-scan. Check for available software updates or reflash the module per OEM procedure.
If module still does not communicate after reprogramming and inputs are correct, consider replacing the TV/head unit. Before replacement, verify replacement unit coding, salting and security/access procedures (Mercedes often requires module coding or pairing).
After repair, clear codes, verify module appearance on the network and perform full functional test. Road test if required and rescan to confirm no reoccurrence.

Likely causes

Blown fuse or disconnected power/ignition supply to TV head unit
Loose or corroded connector at the TV module or gateway
Open or short on the multimedia CAN/MOST wiring harness
Failed TV head unit or internal power supply failure
Bus network fault (missing termination, bus-off from another module)

Fault status

⚠️ Status

Lost communication with television module – TV/head unit not responding on vehicle network. Condition may be intermittent or permanent depending on wiring, power or module fault.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours

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U0192 — Lost Communication with Television