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Home / DTC / B1074 — R.air outlet potentio.Inactive

B1074 — R.air outlet potentio.Inactive

Detailed page for trouble code B1074.

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Code

B1074

MITSUBISHI B — Body

R.air outlet potentio.Inactive

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

Causes

  • Open or short in potentiometer signal, power, or ground circuit
  • Loose, corroded or disconnected connector at the actuator/potentiometer
  • Failed potentiometer (worn or internally open)
  • Stuck or mechanically seized air outlet door / actuator
  • HVAC actuator motor failure
  • Faulty HVAC control module (rare)

Symptoms

  • Right rear vent does not change position or remains in one position
  • HVAC system shows rear outlet position error or incorrect display
  • Blowing direction/mode cannot be changed for rear vents
  • DTC B1074 stored; possible related HVAC warning or reduced functionality

What to check

  • Read codes and freeze frame data with a scan tool; confirm B1074 is current or historical
  • Visually inspect the right rear actuator, wiring harness and connector for damage, corrosion or disconnection
  • Check related fuses and chassis grounds for HVAC system
  • With ignition on, back-probe the connector to check supply (reference) voltage and ground
  • Use a scan tool to monitor the potentiometer signal while changing vent mode or actuating the rear vent
  • Perform a wiggle test on wiring while watching the signal for intermittent changes

Signal parameters

  • Potentiometer is typically a three‑wire sensor: reference (approx. +5 V), ground, and signal
  • Signal is an analog voltage proportional to flap position (approx. 0.5–4.5 V across travel; confirm with factory data)
  • Open circuit → no signal / floating; short to ground → ~0 V; short to +5 V → ~5 V or stuck
  • Check continuity and resistance between connector terminals if specified by service data

Diagnostic algorithm

  1. Retrieve DTCs and note whether B1074 is active. Cycle HVAC through modes and observe if code reappears.
  2. Perform a visual inspection of the right rear vent actuator, connector and wiring. Repair obvious damage.
  3. Back-probe connector: verify reference voltage (≈5 V) and ground with ignition on. If missing, trace upstream fuse/wiring/control module.
  4. With scan tool or DVOM, monitor the potentiometer signal while commanding the vent/actuator. If signal is static or absent while actuator moves, suspect potentiometer or wiring.
  5. Check continuity and for shorts between signal wire and ground/12 V. Repair wiring faults as needed.
  6. If wiring and connectors are good but signal remains inactive, remove and bench-test or replace the right rear outlet actuator (potentiometer assembly).
  7. After repair or replacement, clear codes and verify proper operation and that B1074 does not return during functional test and road test.
  8. If problem persists after replacing actuator and confirming wiring, consider HVAC control module fault and consult factory diagnostics.

Likely causes

  • Disconnected or damaged connector at the right rear outlet actuator
  • Broken wiring between the actuator and HVAC control unit (chafing, rodent damage)
  • Failed potentiometer inside the rear outlet actuator
  • Mechanically jammed vent door preventing potentiometer movement

Fault status

⚠️ Status
Right rear air outlet potentiometer inactive — control unit detects no valid position signal from the right rear vent potentiometer (open, short, disconnected or failed sensor).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1070 B1071 B1072 B1073 B1075
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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