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Home / DTC / B28C6 — Window LIN bus:inconsistent

B28C6 — Window LIN bus:inconsistent

Detailed page for trouble code B28C6.

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22,491specific
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Code

B28C6

MITSUBISHI B — Body

Window LIN bus:inconsistent

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

Causes

  • Intermittent or broken wiring/corrosion in LIN bus or grounds
  • Faulty LIN transceiver on window or door module
  • Short to battery or short to ground on the LIN wiring
  • One or more modules driving the bus incorrectly (bus contention)
  • Low or unstable battery/supply voltage
  • Software/configuration mismatch or corrupted module firmware

Symptoms

  • Power window(s) operate intermittently or not at all
  • Windows move erratically or stop mid-travel
  • Multiple window/door related fault codes present
  • Door/window modules show communication faults in scan tool
  • Occasional battery drain or wake/sleep failures related to body network

What to check

  • Read and record all stored DTCs with manufacturer scan tool; note freeze frame data
  • Check battery voltage and charging system; ensure stable VBatt (12–14.5 V) during tests
  • Visually inspect LIN wiring, connectors, and door hinge flex areas for damage or corrosion
  • Check module power and ground circuits for proper voltage and good chassis ground
  • Use a scan tool to monitor LIN messages/frames and see which node is reporting errors
  • Use an oscilloscope or LIN-capable scope to observe waveform on LIN line for noise, missing frames, or contention

Signal parameters

  • LIN bus is a single-wire low-speed serial bus (one-wire logical line with ground reference)
  • Idle/recessive level pulled up to vehicle battery (VBatt) through transceiver/pull-up resistor; dominant level is low ≈ 0 V
  • Common baud rates: 9.6 kbps or 19.2 kbps (verify manufacturer specification for exact rate)
  • Expected behavior: master sends header, addressed slave replies within defined timing windows; inconsistent timing or corrupted frames indicate faults
  • A healthy LIN line should show clean transitions and no sustained contention (no two drivers actively holding different levels)

Diagnostic algorithm

  1. Retrieve and document DTCs and freeze frame data; clear codes and attempt to reproduce the fault to verify persistence.
  2. Verify battery voltage and stable supply while operating windows; low voltage can corrupt LIN messages.
  3. Visually inspect connectors and harnesses at the affected door(s), window regulator, door module and gateway for corrosion, loose pins, or damage—repair as needed.
  4. With ignition on, use a scan tool to monitor LIN communication frames. Identify which module reports failure and whether the master is sending headers.
  5. Wiggle-test wiring while monitoring communication with scan tool to see if fault is induced by movement (indicates broken conductor or intermittent connector).
  6. Measure LIN line with an oscilloscope or LIN-capable diagnostic tool: look for clean recessive and dominant voltages, correct frame timing, excessive noise, or bus contention (two drivers).
  7. If contention or abnormal levels are detected, isolate nodes by disconnecting LIN connectors one at a time while observing the bus until the fault stops—this identifies the defective node.
  8. Check power and ground circuits for the suspected module(s). Repair any poor grounds, replace blown fuses, and ensure proper supply voltages to modules.
  9. Inspect for aftermarket devices or recent repairs that may have disturbed the LIN wiring; remove or correct as necessary.
  10. If a specific module is isolated as faulty, check for software updates, reflashes, or replace the module/transceiver per manufacturer procedures. After repair, clear codes and perform full system checks.

Likely causes

  • Damaged harness or chafed insulation at door hinge area
  • Corroded connector at window/door module or central junction
  • Failed window control module LIN transceiver
  • Aftermarket accessory improperly connected to LIN wiring
  • Intermittent ground at door module or body control module

Fault status

⚠️ Status
Inconsistent LIN bus communication detected on window network. Intermittent or corrupted LIN frames have been observed between the window/door module(s) and the LIN master.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-3.0 hours

Similar codes

U0073 U0100 U0140 U0121 B28C5 B28C7
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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