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Home / DTC / B28C2 — Window LIN bus:checksum error

B28C2 — Window LIN bus:checksum error

Detailed page for trouble code B28C2.

34,405codes
59brands
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22,491specific
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Code

B28C2

MITSUBISHI B — Body

Window LIN bus:checksum error

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

Causes

  • Faulty or intermittent wiring/connector on the LIN bus
  • Damaged or shorted LIN bus wire to battery or ground
  • One or more failed/repeating window module(s) on the LIN network
  • Excessive electrical noise or interference on the LIN line
  • Incorrect or corrupted module software/calibration
  • Poor ground or low battery/charging system voltage during communication

Symptoms

  • One or more power windows operate intermittently or not at all
  • One-touch/auto up-down function fails or behaves erratically
  • Stored communication faults in body/window control modules
  • Multiple window units affected or random failures in window operation
  • Possible related body-network features degraded (mirror, door lock) if on same LIN segment

What to check

  • Read and record all related DTCs and freeze-frame data with a capable scan tool
  • Visually inspect LIN wiring and connectors at affected doors/modules for corrosion, pin damage, or poor connection
  • Check battery and charging system voltage; ensure stable supply during testing
  • Disconnect individual window modules or switches one at a time to see if fault clears (isolate the faulty node)
  • Backprobe LIN line and measure idle voltage and dominant low levels with a multimeter
  • Use an oscilloscope or dedicated LIN bus tool to inspect waveform for bit errors, noise, or collisions

Signal parameters

  • LIN single-wire physical layer: idle (recessive) ~ battery voltage, dominant ~ 0 V
  • Typical LIN baud rate ~ 9.6–19.2 kbps (model dependent) — verify against vehicle spec
  • Checksum: classic or enhanced checksum used depending on frame ID — corrupted payload triggers error
  • Valid frame timing and break/sync bytes required; look for missing or malformed header
  • Expected dominant pulse amplitude near 0 V and rise to battery voltage; excessive ringing or noise indicates physical-layer faults

Diagnostic algorithm

  1. Connect a dealer-level or compatible scan tool, read all LIN/window-related codes and note freeze-frame. Clear codes and attempt to reproduce.
  2. Verify stable battery/charging voltage. Perform tests with battery fully charged or use a stable power supply.
  3. Inspect and wiggle-test connectors and harnesses at the affected door(s), window switch, and window motor/module while observing the fault memory and operation.
  4. Backprobe the LIN wire at the master and each slave. Measure idle voltage and check for shorts to Vb or ground with the ignition on.
  5. Use an oscilloscope or LIN bus analyzer to capture frames during attempted window operation. Look for malformed headers, checksum mismatches, noise, or overlapping transmissions.
  6. Isolate nodes by disconnecting each slave module one at a time (or each switch) to identify if a single node causes checksum errors. If disconnecting a node clears the error, inspect/replace that node.
  7. If wiring and modules appear good, verify software/calibration level of the window/body modules and reprogram or update per OEM procedure.
  8. After repair or replacement, clear DTCs and confirm proper operation over several cycles and drive conditions.

Likely causes

  • Broken or corroded connector at window control switch or window motor module
  • Short to accessory power or chassis ground at the LIN wiring harness
  • Failed window control module (slave) sending corrupt frames
  • Noise from nearby high-current wiring (motors, alternator) coupling into LIN
  • Recent module replacement without correct programming or incompatible firmware

Fault status

⚠️ Status
Window LIN bus checksum error — received LIN message payload failed checksum validation, indicating corrupted communication on the window LIN network.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B28C0 B28C1 B28C3 U0100 U0140 U0121
406

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