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Home / DTC / B28C3 — Window LIN bus:slave no response

B28C3 — Window LIN bus:slave no response

Detailed page for trouble code B28C3.

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B28C3

MITSUBISHI B — Body

Window LIN bus:slave no response

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

Causes

  • Open or shorted LIN bus wiring between master and slave
  • Poor power or ground to the window slave module
  • Corroded or loose connector pins at the slave module or master
  • Faulty window slave module (internal electronics)
  • Fault in the LIN master (body control module/window master)
  • Blown fuse or battery voltage issues during communications

Symptoms

  • Affected window (one door or set) inoperative or intermittent operation
  • No LIN data or missing slave response visible on scan tool for that module
  • Central/window switch may show no status for the door/window module
  • Other body functions on the same LIN branch may be affected (if present)
  • Possible frozen or stuck window position reporting

What to check

  • Retrieve complete fault list and live data with a capable scan tool supporting Mitsubishi LIN modules
  • Verify battery voltage stable (12.0–14.5 V) with ignition ON and during tests
  • Check relevant fuses and power feeds for window/body modules
  • Inspect connectors and wiring at the affected door/window module and at the body control (master) for corrosion, pin damage, or loose terminals
  • Perform wiggle test on harness while monitoring live data or communication status
  • Use oscilloscope or CAN/LIN capable scope to view LIN bus waveform on the branch with the slave

Signal parameters

  • LIN bus is single-wire serial network (typical baud 19.2 kbps on many vehicles)
  • Idle level: pulled up to battery via master pull-up; dominant state pulls line near 0 V
  • Expected: periodic header and response frames from master and slave respectively; absence of slave response indicates no dominant response window
  • Measure with scope: look for correct header timing and reply slot; reply should be low pulses corresponding to data bytes
  • If using a multimeter, expect pulsed voltage—use scope or LIN-capable tool for reliable analysis

Diagnostic algorithm

  1. Record freeze frame and all stored codes; note which door/module is reported. Clear codes and attempt to reproduce the fault.
  2. Verify battery and charging system voltage; perform tests with ignition ON and during attempted window operation.
  3. Check fuses and power/ground circuits for the affected slave module; back-probe connector pins and confirm proper supply and ground present.
  4. Visually inspect and secure connectors and wiring at the door, hinge area, and body control module; look for chafing, corrosion, or water intrusion.
  5. Use a scan tool to request module presence on the LIN network. If the slave does not respond, try commanding the window from the master and observe responses/live data.
  6. Monitor the LIN bus with an oscilloscope or LIN-capable tool at the slave connector while commanding the window. Verify the master header is present and whether the slave drives the response slot.
  7. If LIN header present but no slave response, check continuity of LIN wire to the master and measure resistance to ground/shorts to battery.
  8. If wiring and supply good and no response, replace or bench-test the suspected slave module (swap with known-good if available) and re-test.
  9. If replacement does not restore communications, investigate the master (body control/window master) and its LIN driver; check for software updates or reflash as required.
  10. After repair, clear codes and test multiple cycles to confirm fault does not return.

Likely causes

  • Damaged or disconnected LIN wire to affected window module
  • Bad ground or 12V supply at the slave module
  • Corroded connector at the window motor/module or body harness
  • Failed window slave module electronics
  • Fault in body control module or LIN driver

Fault status

⚠️ Status
Window LIN bus — the window slave module failed to respond to LIN network requests. Indicates a communication fault between the master (body/window control) and the slave window module; requires wiring, power/ground, and module checks.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

U0100 U0121 U0140 U0155 U0243
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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