U0190

Code

Generic U — Network/User

Lost Communication With Digital Disc Player/Changer Module D

Brand: Generic

Type: U — Network/User

Views: UK: 30 EN: 37 RU: 35

AI status

Completed

ready

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Page language: EN

Causes

Blown fuse or lost accessory power to the disc player/changer module
Open, shorted, damaged or corroded wiring or connectors to the module
Poor or missing ground at the module
Faulty Digital Disc Player/Changer Module D
Faulty or compromised vehicle data bus (CAN/LIN/FlexRay depending on vehicle)
Bus termination fault or short between CAN High and CAN Low

Symptoms

Inoperative disc player/changer (no audio or changer function)
Audio system displays module not present or communication error
Multiple network-related DTCs present
Intermittent audio or infotainment system faults
No data from the module when viewing live data in a scan tool

What to check

Check for any related fuses and verify fuse continuity and presence of 12 V with key on
Visually inspect the module connector for corrosion, bent pins, water ingress, or damage
Verify good ground at the module (0 Ω to chassis ground) and battery negative
Use a scan tool to see if the module is present on the network and whether it responds to requests
Check for CAN/LIN bus activity with a scope or data logger at the module connector
Measure resistance between CAN_H and CAN_L with ignition off — expected approx. 60 Ω (two 120 Ω terminators in parallel)

Signal parameters

Module supply voltage (key on): ~12 V (within vehicle spec)
Module ground: near 0 V
CAN bus idle voltages: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (vehicle dependent)
CAN bus dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V (differential ≈ 2 V)
Resistance between CAN_H and CAN_L (ignition off): ≈ 60 Ω total (two 120 Ω terminators in parallel)
No valid CAN frames or no module-specific messages seen when querying the network

Diagnostic algorithm

Retrieve all stored U-codes and related freeze frame/uid data with a capable scan tool. Note any other network codes.
Inspect fuses for the audio/disc player circuit and verify 12 V at the module power pin with key on and accessory positions.
Inspect module connector for corrosion, bent pins, water damage, or pushed-out terminals; repair or replace as needed.
Verify good chassis ground at the module — measure voltage drop while cranking and continuity to battery negative.
With a scan tool, check if the disc player module is enumerated on the bus. If not present, check for bus activity:
Use an oscilloscope or CAN data logger at the module connector to confirm CAN_H/CAN_L activity.
Measure CAN idle voltages and differential and compare to expected values.
Check resistance between CAN_H and CAN_L with ignition off. If resistance is very high (open) or very low (short), trace and repair wiring.
Perform a wiggle/strain test of the harness while monitoring for communication to locate intermittent faults.
If wiring, power and ground check good but still no communication, try a known-good module (or swap with similar module if available) to verify module failure before replacement.
Check for software updates, module programming or configuration issues — reprogram or update if vendor bulletins indicate.
Clear codes after repairs and verify that the module is communicating under all operating conditions and that related functions are restored.

Likely causes

Disconnected or corroded connector at the disc player/module
Power or ground feed fuse blown or connector pin open
Damaged CAN/LIN harness in door or dash area causing open/short
Failed module electronics
Network disruption caused by another faulty module or wiring short to battery/ground

Fault status

⚠️ Status

Lost communication with Digital Disc Player/Changer Module D — no response on vehicle data bus

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours

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