Code
U0183
Generic
U — Network/User
Lost Communication With Lighting Control Module - Rear A
Views:
UK: 25
EN: 40
RU: 35
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring on the communication bus
- Faulty rear lighting control module
- Loss of module power or ground
- Faulty or missing network termination
- Intermittent connector or pin damage at the module
- Another module driving the bus to an error state (bus-off)
Symptoms
- Rear lights (tail, brake, reverse, turn signals) intermittent or nonfunctional
- Message or lamp indicating lighting system fault on dash
- Other modules reporting network timeouts or errors
- No module present in scan-tool module list or missing from network topology
- Fuse(s) for lighting module blown
What to check
- Connect a professional scan tool; verify U0183 and any related U-codes or bus-off conditions
- Check that the lighting module appears on the network and note last message timestamps
- Inspect module connectors for corrosion, bent pins, or water intrusion
- Verify module power and ground voltages at the connector with engine off and on
- Measure CAN High/Low voltages and compare to expected idle and dominant levels
- Check termination resistance across CAN_H and CAN_L (approx. 60 ohms total)
Signal parameters
- CAN bus idle: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (voltages vary by manufacturer)
- CAN dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V
- Typical CAN termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN_H & CAN_L
- Common CAN data rates: 500 kb/s or 250 kb/s (verify vehicle-specific rate)
- Lighting module typically transmits periodic status messages (intervals often 50–250 ms)
Diagnostic algorithm
- Read and record DTCs from all modules; clear codes and attempt to reproduce U0183.
- Confirm the Lighting Control Module is listed on the network via scan tool; note module address and response.
- Visually inspect the module connector and wiring for corrosion, damage, water intrusion, or insecure terminals.
- With ignition on, measure module supply voltage and ground at the connector; verify within spec.
- Measure CAN_H and CAN_L at the module connector with a multimeter; check idle and compare to other known good nodes.
- If voltages look abnormal or intermittent, use an oscilloscope to inspect CAN waveforms for noise, dominant states, and error frames.
- Check termination resistance across CAN_H and CAN_L; if out of spec, locate and inspect/remove faulty termination or resistance source.
- Inspect and continuity-test wiring between the lighting module and nearest gateway/BCM; repair any open or short circuits.
- If bus errors or bus-off conditions present, isolate by disconnecting modules one at a time (start with suspect wiring) to find the faulty node.
- If wiring, power and ground are good but the module does not respond, verify programming/version and update/reflash per manufacturer procedure.
- Replace the lighting control module only after confirming wiring, power/ground, and network integrity; perform post-repair relearn/configuration as required.
- After repair, clear codes and verify restoration of communication and proper lighting function; road test if needed.
Likely causes
- Corroded or disconnected connector at the Rear A Lighting Control Module
- Damaged CAN/LIN wiring harness between BCM and lighting module
- Module has lost internal power supply or ground
- High error rate on CAN bus caused by a short to battery or ground
- Module firmware corrupted or not configured for this vehicle
Fault status
Status
Lost communication with Rear A Lighting Control Module on vehicle network; module messages not received or module not present.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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Code
U0183
HYUNDAI
U — Network/User
Lost Communication With Lighting Control Module Rear
Views:
UK: 21
EN: 28
RU: 27
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring on the communication bus
- Faulty rear lighting control module
- Loss of module power or ground
- Faulty or missing network termination
- Intermittent connector or pin damage at the module
- Another module driving the bus to an error state (bus-off)
Symptoms
- Rear lights (tail, brake, reverse, turn signals) intermittent or nonfunctional
- Message or lamp indicating lighting system fault on dash
- Other modules reporting network timeouts or errors
- No module present in scan-tool module list or missing from network topology
- Fuse(s) for lighting module blown
What to check
- Connect a professional scan tool; verify U0183 and any related U-codes or bus-off conditions
- Check that the lighting module appears on the network and note last message timestamps
- Inspect module connectors for corrosion, bent pins, or water intrusion
- Verify module power and ground voltages at the connector with engine off and on
- Measure CAN High/Low voltages and compare to expected idle and dominant levels
- Check termination resistance across CAN_H and CAN_L (approx. 60 ohms total)
Signal parameters
- CAN bus idle: CAN_H ≈ 2.5 V, CAN_L ≈ 2.5 V (voltages vary by manufacturer)
- CAN dominant state: CAN_H ≈ 3.5 V, CAN_L ≈ 1.5 V
- Typical CAN termination: two 120 Ω resistors in parallel ≈ 60 Ω across CAN_H & CAN_L
- Common CAN data rates: 500 kb/s or 250 kb/s (verify vehicle-specific rate)
- Lighting module typically transmits periodic status messages (intervals often 50–250 ms)
Diagnostic algorithm
- Read and record DTCs from all modules; clear codes and attempt to reproduce U0183.
- Confirm the Lighting Control Module is listed on the network via scan tool; note module address and response.
- Visually inspect the module connector and wiring for corrosion, damage, water intrusion, or insecure terminals.
- With ignition on, measure module supply voltage and ground at the connector; verify within spec.
- Measure CAN_H and CAN_L at the module connector with a multimeter; check idle and compare to other known good nodes.
- If voltages look abnormal or intermittent, use an oscilloscope to inspect CAN waveforms for noise, dominant states, and error frames.
- Check termination resistance across CAN_H and CAN_L; if out of spec, locate and inspect/remove faulty termination or resistance source.
- Inspect and continuity-test wiring between the lighting module and nearest gateway/BCM; repair any open or short circuits.
- If bus errors or bus-off conditions present, isolate by disconnecting modules one at a time (start with suspect wiring) to find the faulty node.
- If wiring, power and ground are good but the module does not respond, verify programming/version and update/reflash per manufacturer procedure.
- Replace the lighting control module only after confirming wiring, power/ground, and network integrity; perform post-repair relearn/configuration as required.
- After repair, clear codes and verify restoration of communication and proper lighting function; road test if needed.
Likely causes
- Corroded or disconnected connector at the Rear A Lighting Control Module
- Damaged CAN/LIN wiring harness between BCM and lighting module
- Module has lost internal power supply or ground
- High error rate on CAN bus caused by a short to battery or ground
- Module firmware corrupted or not configured for this vehicle
Fault status
Status
Lost communication with Rear A Lighting Control Module on vehicle network; module messages not received or module not present.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
Similar codes
Repair manuals
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