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Home / DTC / B28B7 — RL P/W initialization

B28B7 — RL P/W initialization

Detailed page for trouble code B28B7.

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22,461specific
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Code

B28B7

MITSUBISHI B — Body

RL P/W initialization

Brand: MITSUBISHI
Type: B — Body
Views: UK: 22 EN: 30 RU: 25
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Vehicle battery disconnected or low voltage causing lost learned position
  • Incomplete or failed power-window initialization/learning procedure
  • Faulty rear-left power window motor or regulator (mechanical jam)
  • Defective rear-left window switch or door module
  • Open/short in wiring harness or poor connector/ground at RL door
  • Blown fuse or relay in power-window circuit

Symptoms

  • Rear-left window does not operate or only operates manually
  • Auto up/down or anti-pinch function does not work for rear-left window
  • DTC B28B7 stored in the body/power-window controller
  • Window movement is intermittent or stops partway
  • Possible clicking from relay/driver but no motor movement

What to check

  • Use a diagnostic scanner to read codes from body/power-window control module and check freeze frame or readiness data
  • Attempt the manufacturer's initialization/learning procedure for the rear-left window (follow service manual)
  • Verify battery voltage is stable (>12V) during tests
  • Inspect fuse(s) for power-window circuits and relays
  • Visually inspect RL door wiring, connectors and grounds for corrosion or damage
  • Operate the RL switch while watching/feeling for motor movement and listening for motor/driver noise

Signal parameters

  • Battery voltage at window motor (V)
  • Switch input voltage to power-window ECU (V)
  • Motor drive command voltage/signal from control module (V or PWM duty)
  • Motor current during operation (A) — used to detect stall/binding
  • Motor DC resistance (Ω)
  • Ground continuity to motor and switch

Diagnostic algorithm

  1. Connect a diagnostic scanner and read all body/power-window related DTCs; record and clear codes, then reattempt operation to re-check.
  2. Confirm vehicle battery voltage is healthy; recharge if low. Ensure ignition in required position for initialization.
  3. Attempt OEM rear-left power-window initialization/learning procedure (service manual). Note whether procedure completes or fails and any error messages.
  4. If initialization fails, inspect fuses/relays for the power-window circuit and replace if defective.
  5. With ignition on, operate RL switch while monitoring voltage at the motor connector. If motor supply voltage is present but motor does not turn, suspect motor/regulator or mechanical jam.
  6. Measure motor current while commanding movement. High current or zero current indicates stall or open circuit respectively.
  7. Check continuity and resistance of wiring between switch, motor and control module; repair any open/shorts and clean corroded connectors.
  8. Inspect window regulator and glass for binding, broken cables or seized components; repair or replace regulator/motor assembly as required.
  9. If wiring, motor and regulator are good, verify switch operation and replace switch or door module if defective.
  10. If all hardware checks pass, inspect/replace body control module or reflash software per manufacturer guidance.
  11. After repairs, perform the initialization/learning procedure again and verify normal operation and that DTC B28B7 does not return.

Likely causes

  • Initialization routine not performed after battery replacement or service
  • Window motor seized or regulator binding preventing movement through learn range
  • Corroded connector or broken wire between switch and motor
  • Switch contacts worn or stuck — no command to the motor
  • Blown fuse supplying the window motor or control module

Fault status

⚠️ Status
Rear-left power window not initialized or initialization failed — perform initialization and check RL window system.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B28B6 B28B8 B2801 B2837
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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