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Home / DTC / B28BF — All P/W no response

B28BF — All P/W no response

Detailed page for trouble code B28BF.

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Code

B28BF

MITSUBISHI B — Body

All P/W no response

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

Causes

  • Blown power window fuse or fusible link
  • Faulty power window relay or main power supply relay
  • Power window master switch (master/control unit) failure
  • Window lock-out switch engaged or faulty
  • Body control module (BCM) / power window control module fault or lost CAN communication
  • Open/short in power or ground wiring to the window system

Symptoms

  • None of the vehicle's power windows operate when using any door switch
  • No audible motor noise from any door when attempting to operate windows
  • Window switches have no illumination or no response
  • Other body electrical functions (interior lights, door locks) may be affected if BCM power or ground is lost

What to check

  • Verify battery voltage and ignition position (accessory/ON) before tests
  • Check power window fuse(s) and fusible links for continuity and correct rating
  • Check operation/position of the window lock-out switch
  • Inspect and test the power window relay (swap with a known-good relay of same type if available)
  • Scan for U/B/B-series DTCs in BCM/power window module and check CAN bus communication
  • Measure voltage at the power window fuse terminal with ignition ON (should be ~11–14 V)

Signal parameters

  • Battery voltage (resting): ~12.4–12.8 V; with engine running: 13.5–14.5 V
  • Power at window fuse (IGN ON): ~11–14 V
  • Master switch supply pin (IGN ON): ~11–14 V
  • Master switch output when operated: switching between ~0 V and ~11–14 V (or PWM pulses) depending on design
  • Ground continuity to chassis: near 0 Ω (typically
  • Window motor coil continuity: low resistance (usually a few ohms) — varies by motor

Diagnostic algorithm

  1. Safety: Park vehicle, key OFF, use appropriate personal protective equipment. Disable airbags only if instructed by OEM procedures for deeper disassembly.
  2. Verify symptom: With ignition in ACC/ON, attempt to operate each window from both master and individual switches. Note any partial responses or audible clicks.
  3. Check fuses: Inspect and test the power window fuse(s) and related fusible links for continuity and correct amperage. Replace any blown fuses and re-test.
  4. Check lock-out and ignition: Ensure the window lock-out switch is not engaged and ignition is in the correct position for window operation.
  5. Check relay and power feed: Locate and test/swap the power window/main relay. Measure voltage at the relay output and at the fuse box terminal with switch operated.
  6. Measure supply at master switch: Back-probe the master switch power supply and ground with IGN ON. Confirm ~12 V supply and good ground. If supply missing, trace back to relay/fuse/ignition source.
  7. Probe switch outputs: While operating the master switch, measure outputs to each door harness. If no output from master but supply present, suspect master switch/module failure.
  8. Test motors individually: Remove door panel as required and apply direct 12 V to each window motor from battery (use fused jumper). If motors run, wiring or switch/BCM is at fault. If motors do not run, replace motor.
  9. Check BCM/communication: Use a scan tool to read BCM/door module DTCs and monitor CAN bus status. If BCM not communicating or reporting faults, follow body module diagnostics.
  10. Inspect wiring/connectors: Visually inspect and continuity-test harnesses, door harness flex points, connector pins and grounds. Repair any corrosion, broken wires or poor connections.
  11. Replace/repair: Replace the faulty component(s) determined by above tests (fuse/relay, master switch, BCM, wiring repair, motor). After repair, clear codes and re-test full function.
  12. Final check: Verify operation of all windows from all switches and confirm no reoccurring DTCs. Road-test and re-check electrical functions as needed.

Likely causes

  • Missing/low voltage at the power window fuse or relay (most common)
  • Master switch/lock-out switch failure preventing outputs to all windows
  • BCM not providing outputs or not receiving switch inputs (communication fault)
  • Common ground open or high resistance affecting entire window circuit

Fault status

⚠️ Status
All power windows unresponsive. Likely common power/ground, master switch, relay or body control/communication fault affecting entire window system.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

U0140 U0100 U0121 B1234 B1200
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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