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Home / DTC / B28C1 — Window LIN bus:bit error

B28C1 — Window LIN bus:bit error

Detailed page for trouble code B28C1.

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Code

B28C1

MITSUBISHI B — Body

Window LIN bus:bit error

Brand: MITSUBISHI
Type: B — Body
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Intermittent or failed LIN network wiring (open, short to Vb or ground, high resistance)
  • Corroded or loose connector at window motor/module or gateway
  • Faulty LIN transceiver inside the window control module
  • Multiple nodes driving the bus at the same time (bus contention)
  • Low or unstable battery/vehicle supply voltage during communication
  • Software/firmware bug in window module or master gateway

Symptoms

  • Window(s) operate intermittently or not at all
  • One or more LIN-related DTCs present (window or gateway modules)
  • Erratic or delayed window responses when switching
  • Multiple modules on the same LIN bus showing communication errors
  • Possible audible clicking from window motor/controller during faults

What to check

  • Confirm battery voltage is within specification (engine off and on) and terminals are clean/tight
  • Scan all modules and note other LIN/U codes on same bus — identify affected nodes
  • Visually inspect door harnesses, connectors and module for corrosion, damage or water ingress
  • Wiggle test door harness/connectors while watching live data for dropped frames or errors
  • Check fuses and power/ground feeds for the window module
  • Measure LIN line with a scope while operating the switch to view waveform and collisions

Signal parameters

  • LIN physical: single-wire, recessive ~battery voltage, dominant pulled low by transceiver
  • Typical LIN baud rate: 19200 bps (verify model-specific rate in manual)
  • LIN header: break, sync (0x55), ID then response — check for correct sync byte
  • Checksum: classic or enhanced CRC depending on LIN version — invalid checksum flags a bit/frame error
  • Expected idle voltage ~12 V; dominant low pulses to near 0 V when active
  • Look for clean break and sync patterns on scope; distortion, missing sync or overlapping responses indicate errors

Diagnostic algorithm

  1. Record freeze frame and full scan results. Note any other related communication DTCs and affected modules.
  2. Verify battery and vehicle supply voltages. Recharge or replace battery if low and retest.
  3. Visually inspect all connectors and harnesses for the window module, door jamb, and gateway. Repair corrosion or damaged wiring.
  4. Check fuses and power/ground feeds to the window module. Repair poor grounds.
  5. With a diagnostic tool, monitor LIN frames/parameters for the window node. Attempt to reproduce the fault (operate switch).
  6. Use an oscilloscope on the LIN line at the module connector to capture waveform: verify break, sync (0x55), ID, response timing, and checksum. Look for collisions or noise.
  7. If waveform shows constant low, short to ground; if noisy or missing frames, trace wiring and repair short/open.
  8. Disconnect the window module (or other suspect node) and observe if bus errors stop — isolate faulty node.
  9. If wiring and connectors are good but errors persist, consider replacing the window control module or its LIN transceiver. Check for available software updates before replacement.
  10. After repair, clear codes and perform full function check of windows and re-scan to confirm fault does not return.

Likely causes

  • Damaged/poor connector at the window control unit
  • Faulty window control module LIN transceiver
  • Short or high-resistance splice on the LIN wiring near door harness
  • Intermittent voltage drop (poor ground or battery connection) affecting LIN signalling
  • Bus contention from a failed aftermarket device or another module

Fault status

⚠️ Status
LIN bus bit/frame error detected on window control network — invalid timing/format or checksum on LIN frame.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

B28C0 B28C2 U0073 U0100 U0121
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

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