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Home / DTC / B1073 — R.air outlet DMPR.potentio.open

B1073 — R.air outlet DMPR.potentio.open

Detailed page for trouble code B1073.

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Code

B1073

MITSUBISHI B — Body

R.air outlet DMPR.potentio.open

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

Causes

  • Open or broken wiring between the right rear damper potentiometer and HVAC control module
  • Corroded or loose connector at the damper actuator
  • Failed potentiometer inside the damper/actuator assembly
  • Water ingress or physical damage to the actuator
  • HVAC control module or actuator driver fault
  • Blown fuse or poor ground affecting the potentiometer reference/return

Symptoms

  • Right rear vent/damper does not move or does not respond to mode/air distribution commands
  • Incorrect or fixed airflow direction from the right rear vent
  • HVAC system displays fault or one-touch mode control is limited
  • Stored B1073 code and possible related HVAC fault warning

What to check

  • Visual inspection of wiring harness and connector at the right rear damper actuator for damage, corrosion, or disconnected clips
  • Check fuses for HVAC/air distribution system
  • With ignition on, probe connector for reference voltage (usually 5V reference) and ground presence
  • Measure continuity between actuator potentiometer pins and HVAC control module connector
  • Wiggle harness while monitoring signal to check for intermittent open
  • Replace or bench-test actuator/potentiometer if wiring and connectors are good

Signal parameters

  • Reference voltage typically ~5 V (key ON) to potentiometer reference pin
  • Potentiometer signal output varies with damper position (approx. 0–5 V or 0.5–4.5 V depending on position)
  • Open-circuit detection when signal is no voltage or infinite resistance
  • Typical potentiometer resistance range: low kilo-ohm range (model dependent); open detected when >>10 kΩ or infinite

Diagnostic algorithm

  1. Read and record freeze frame/fault data; confirm B1073 is present. Attempt to reproduce symptom with HVAC controls.
  2. Perform a visual inspection of the right rear damper actuator harness and connector for damage, corrosion, or poor seating.
  3. With ignition ON (engine off), back-probe the actuator connector: verify reference voltage, ground, and potentiometer signal present. Note voltages with damper moved via HVAC controls.
  4. Check continuity and resistance between the actuator potentiometer pins and the HVAC control module connector. Compare to open-circuit expectations.
  5. If wiring and connectors are intact, disconnect actuator and measure potentiometer resistance while moving the damper shaft; replace actuator if resistance is open or does not change smoothly.
  6. Repair any damaged wiring, clean/replace corroded connectors, secure harness routing. If wiring and actuator test good, inspect HVAC control module outputs/grounds and replace module if proven faulty.
  7. After repairs, clear codes and verify proper operation across full range of damper positions and that B1073 does not return.

Likely causes

  • Pinched or chafed wire at a door hinge or under trim causing an open circuit
  • Connector pushed out or not fully seated after prior service
  • Actuator potentiometer failure due to wear or contamination
  • Moisture corrosion at the connector causing intermittent open
  • Fault in HVAC control unit (less common) or connector terminal failure

Fault status

⚠️ Status
Right rear air outlet damper potentiometer circuit — open or no signal detected (B1073).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 2.0 hours

Similar codes

B1070 B1071 B1072 B1074 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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