The data line (+) between the head unit and the central display has a malfunction. There is an open circuit.

Part of the generic B1592 overview — this page covers the Mercedes-Benz meaning specifically.

What B1592 means

On Mercedes-Benz vehicles equipped with COMAND Online, NTG 5/5.5, or MBUX infotainment, the head unit communicates with the central display via a dedicated data bus — typically Low-Voltage Differential Signalling (LVDS) for video data or a MOST (Media Oriented Systems Transport) bus for media and control data. B1592 is set by the head unit or the display module's controller when the positive line (+) of this inter-unit data link is out of specification. A differential signal bus requires both the + and minus lines to be balanced; an open circuit, short to ground, or damaged connector on the + line will cause the signal to fall outside the valid window, and the receiving module stores B1592. The typical result is a blank or flickering central display, missing menu responses, or video content not updating correctly. On the W205 C-Class, W213 E-Class, and W222 S-Class platforms, LVDS wiring runs behind the dashboard and is susceptible to damage from dashboard removal during other repair work.

Symptoms

• Central display (infotainment screen) blank, showing a white/black screen, or flickering intermittently
• B1592 stored in the head unit (Audio 20/COMAND/MBUX) or central display module fault log
• Infotainment features (navigation, audio, phone) may continue to function through audio (via speaker output) but with no display feedback
• Display may show correctly at startup then go blank after the system warms up (pointing to a thermal/marginal connection fault)
• Other B-series audio or display codes may appear alongside B1592 if the bus fault affects multiple signals

Common causes

• Damaged LVDS cable between the head unit and central display — the flat ribbon or round cable can be pinched or torn during dashboard trim removal for other repairs (airbag, climate, or speaker work)
• Corroded or loose LVDS connector at the head unit or at the back of the central display — the gold-plated contacts can oxidise, particularly in high-humidity environments
• Failed LVDS transmitter circuit in the head unit — the head unit's internal driver for the LVDS + line has failed (less common on vehicles under 7 years old)
• Failed LVDS receiver in the central display module — the display unit's internal input stage for the data + line has developed a fault
• Mechanical damage to the dashboard wiring loom from a minor accident that loaded stress onto the data cable routing

Diagnostic approach

1. Read B1592 with Xentry/DAS and identify which module stores the fault — Connect Xentry Diagnostics or DAS (Diagnosis Assistance System) to the OBD port. Navigate to the head unit or COMAND module and read B1592 with full fault detail. Xentry will identify whether the fault is stored in the head unit (transmitter side) or the display module (receiver side), and may provide the specific line and pin number for targeted diagnosis.
2. Inspect the LVDS/data cable and connectors between head unit and display — Access the back of the central display (remove the centre console trim on W205/W213 or dashboard centre panel on W222). Locate the data cable connecting the head unit to the display. Inspect for visible kinks, pinches, or cuts, particularly if the dashboard has been partially disassembled recently. Inspect the multi-pin connectors at both ends for bent pins or corrosion. Reseat all connectors firmly.
3. Measure LVDS signal integrity if a cable tester is available — If the visual inspection shows no obvious damage, the LVDS cable can be tested for continuity and signal integrity using an LVDS-compatible cable tester or oscilloscope. A properly functioning LVDS + line should show a clean differential signal of 350-400mV amplitude. A DC offset or noise on the + line confirms a cable or termination fault.

Make & model notes

Mercedes-Benz: W205 C-Class (2014-2021) with COMAND Online NTG 5/5.5: B1592 on this model is most commonly traced to the LVDS cable being pinched during dashboard work — particularly behind the instrument cluster surround. The cable runs in a tight channel under the top-cap trim and is easily trapped. Before condemning the head unit or display, fully inspect this cable routing.

Mercedes-Benz: W213 E-Class (2016-2023) with MBUX: on MBUX-equipped models the central display and head unit communicate via an LVDS video link and a separate CAN data link. B1592 on the W213 affects the video display but not the CAN-based infotainment functions. Navigation voices, phone calls, and audio settings may continue to work correctly even when B1592 is active and the screen is blank.

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