Code
U0189
Generic
U — Network/User
Lost Communication With Digital Disc Player/Changer Module C
Views:
UK: 21
EN: 30
RU: 17
AI status
Completed
Completed
100%
Causes
- Open or short in data bus wiring (CAN or LIN) between the module and network
- Failed or unpowered Digital Disc Player/Changer Module C
- Corroded, loose or damaged connector or ground at the module
- Missing or incorrect network termination (open/shorted termination resistors)
- Blown fuse or loss of module supply voltage
- Software/firmware mismatch or module configuration error
Symptoms
- Audio system functions unavailable or intermittent (no disc player/changer control)
- Related infotainment features display errors or blank screen messages
- Multiple network-related trouble codes present for other modules
- Engine may run normally but audio commands produce no response
- Possible intermittent behavior: works sometimes, fails at other times
What to check
- Read and record freeze frame and all stored U-codes with a capable scan tool
- Verify battery voltage (key on) and check fuses/relays for the audio module
- Attempt to communicate with the module using the scan tool; note response
- Inspect the module connector for corrosion, bent pins, or water ingress
- Check for aftermarket audio equipment or recent wiring repairs/modifications
- Scan the network for other modules that also show communication faults
Signal parameters
- CAN bus idle voltages: both CAN H and CAN L should be near 2.5 V (recessive)
- CAN dominant state: CAN H typically rises ~+1.25 V and CAN L falls ~-1.25 V during transmission
- Termination resistance across CAN H-L about 60 ohms (two 120 Ω terminators in parallel)
- Typical CAN data rates: 125 kbps, 500 kbps or 1 Mbps depending on vehicle (verify factory spec)
- Module supply: stable ~12 V at power pin with key on/appropriate mode; good ground continuity
Diagnostic algorithm
- Verify code and vehicle symptoms using a factory-capable scan tool; record multiple codes if present.
- Check battery voltage and inspect/replace fuses or relays feeding the disc player/changer module.
- Attempt to communicate with the module; if no response, try waking the bus (cycle key, operate other devices).
- Visually inspect the module connector and wiring for damage, corrosion, moisture, or aftermarket taps; repair as needed.
- Measure supply voltage and ground at the module connector. Repair any low voltage or poor ground issues.
- With key on and bus active, measure CAN H and CAN L voltages at the module connector and compare to expected values.
- Check termination resistance across CAN H-L at key off; expect ~60 Ω. If abnormal, isolate sections to find short/open.
- If physical layer OK but no module response, check for bus errors using lab scope or factory diagnostic tool to view waveform and data traffic.
- Disconnect the module and inspect for signs of water or internal damage. Reconnect and perform a wiggle test on harness to detect intermittent faults.
- Review recent software updates or installation history; if required, reflash or reprogram the module per factory procedure.
- If module confirmed dead after power/ground and bus verified good, replace the Digital Disc Player/Changer Module C and clear codes. Re-test for proper communication.
- After repair, clear codes and perform road test/operate audio features to verify repair stability.
Likely causes
- Connector at the disc player/changer module is loose, corroded or pins pushed back
- Module power or ground circuit open (fuse, relay, PCB trace failure)
- Short or high-resistance splice in the CAN high/low pair near the module
- Damaged CAN termination resistor or additional improper termination
- Module internal failure preventing network transceiver operation
- Aftermarket stereo connected to same network causing bus faults
Fault status
Status
Lost communication with Digital Disc Player/Changer Module C — module not responding on vehicle network (intermittent or permanent).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
U0189
HYUNDAI
U — Network/User
Lost Communication With Digital Disc Player/Changer Module “C”
Views:
UK: 12
EN: 18
RU: 13
AI status
Completed
Completed
100%
Causes
- Open or short in data bus wiring (CAN or LIN) between the module and network
- Failed or unpowered Digital Disc Player/Changer Module C
- Corroded, loose or damaged connector or ground at the module
- Missing or incorrect network termination (open/shorted termination resistors)
- Blown fuse or loss of module supply voltage
- Software/firmware mismatch or module configuration error
Symptoms
- Audio system functions unavailable or intermittent (no disc player/changer control)
- Related infotainment features display errors or blank screen messages
- Multiple network-related trouble codes present for other modules
- Engine may run normally but audio commands produce no response
- Possible intermittent behavior: works sometimes, fails at other times
What to check
- Read and record freeze frame and all stored U-codes with a capable scan tool
- Verify battery voltage (key on) and check fuses/relays for the audio module
- Attempt to communicate with the module using the scan tool; note response
- Inspect the module connector for corrosion, bent pins, or water ingress
- Check for aftermarket audio equipment or recent wiring repairs/modifications
- Scan the network for other modules that also show communication faults
Signal parameters
- CAN bus idle voltages: both CAN H and CAN L should be near 2.5 V (recessive)
- CAN dominant state: CAN H typically rises ~+1.25 V and CAN L falls ~-1.25 V during transmission
- Termination resistance across CAN H-L about 60 ohms (two 120 Ω terminators in parallel)
- Typical CAN data rates: 125 kbps, 500 kbps or 1 Mbps depending on vehicle (verify factory spec)
- Module supply: stable ~12 V at power pin with key on/appropriate mode; good ground continuity
Diagnostic algorithm
- Verify code and vehicle symptoms using a factory-capable scan tool; record multiple codes if present.
- Check battery voltage and inspect/replace fuses or relays feeding the disc player/changer module.
- Attempt to communicate with the module; if no response, try waking the bus (cycle key, operate other devices).
- Visually inspect the module connector and wiring for damage, corrosion, moisture, or aftermarket taps; repair as needed.
- Measure supply voltage and ground at the module connector. Repair any low voltage or poor ground issues.
- With key on and bus active, measure CAN H and CAN L voltages at the module connector and compare to expected values.
- Check termination resistance across CAN H-L at key off; expect ~60 Ω. If abnormal, isolate sections to find short/open.
- If physical layer OK but no module response, check for bus errors using lab scope or factory diagnostic tool to view waveform and data traffic.
- Disconnect the module and inspect for signs of water or internal damage. Reconnect and perform a wiggle test on harness to detect intermittent faults.
- Review recent software updates or installation history; if required, reflash or reprogram the module per factory procedure.
- If module confirmed dead after power/ground and bus verified good, replace the Digital Disc Player/Changer Module C and clear codes. Re-test for proper communication.
- After repair, clear codes and perform road test/operate audio features to verify repair stability.
Likely causes
- Connector at the disc player/changer module is loose, corroded or pins pushed back
- Module power or ground circuit open (fuse, relay, PCB trace failure)
- Short or high-resistance splice in the CAN high/low pair near the module
- Damaged CAN termination resistor or additional improper termination
- Module internal failure preventing network transceiver operation
- Aftermarket stereo connected to same network causing bus faults
Fault status
Status
Lost communication with Digital Disc Player/Changer Module C — module not responding on vehicle network (intermittent or permanent).
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
Your feedback helps improve AI descriptions.
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Send to email