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Home / DTC / B1075 — R.air outlet changeover DMPR.MTR

B1075 — R.air outlet changeover DMPR.MTR

Detailed page for trouble code B1075.

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Code

B1075

MITSUBISHI B — Body

R.air outlet changeover DMPR.MTR

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

Causes

  • Open or short in damper motor power or ground circuit
  • Poor or corroded connector/terminal at the damper motor
  • Failed damper motor (burnt windings, internal gear failure)
  • Mechanical binding or obstruction of the damper/gear train
  • Faulty HVAC control module or actuator driver
  • Blown fuse or poor chassis ground

Symptoms

  • Right/rear air outlet does not change position when mode is changed
  • HVAC mode changes have no effect on some vents (right/rear)
  • Noise from the dash area (grinding, clicking) during mode changes
  • DTC stored and may illuminate HVAC/service warning on some models
  • Uneven airflow distribution or inability to direct air to intended vents

What to check

  • Visually inspect damper motor and nearby ducting for obstructions, broken gears, or foreign objects
  • Inspect connector and wiring for corrosion, bent pins, damage, or water ingress
  • Check relevant fuses for HVAC/actuator circuit
  • Use a scan tool to read HVAC module data and attempt to actuate the right air outlet changeover motor
  • Check for related DTCs in the HVAC module
  • Listen for motor movement or abnormal noises while commanding the actuator

Signal parameters

  • Supply voltage at actuator connector: approx. battery voltage (verify exact spec in factory manual) when actuator is commanded ON
  • Control signal: ground-switched or PWM from HVAC module (frequency/duty varies by model) — verify with service data
  • Actuator coil resistance: typically low ohms (measure with multimeter; compare to service spec)
  • Motor current draw: should be within a low-amp range under free-run; excessive current suggests binding or stall
  • Position feedback (if fitted): voltage or resistance value should change when commanded — consult OEM data

Diagnostic algorithm

  1. Retrieve and record the DTC and any freeze frame or related HVAC codes with a scan tool
  2. Visually inspect the right/rear damper motor, ducting and connectors for damage, obstructions, or water intrusion
  3. Check fuses and chassis ground for the HVAC/actuator circuit
  4. With ignition ON, use a scan tool to command the right air outlet changeover actuator and observe movement and any live data or actuator status
  5. Probe the actuator connector while commanding the motor: verify supply voltage and ground/PWM signal presence (compare to battery voltage and expected control signal)
  6. If no control signal but module commands are present on scan tool, test wiring back to the module for open/short
  7. Measure actuator coil resistance with the connector disconnected; compare to service specification. If resistance is open or shorted, replace the actuator
  8. Bench-test the actuator by applying battery power momentarily and observe movement and noise (be careful to avoid damage)
  9. If actuator works on bench and wiring/signals are correct but it binds in vehicle, inspect and repair duct/mechanism for obstruction or broken gears
  10. If wiring, connector and actuator are good but no correct control signal from HVAC module, consider HVAC control module diagnosis or replacement — consult factory diagnostics
  11. Clear codes and retest the system; verify proper operation and that DTC does not return

Likely causes

  • Connector corrosion or loose connector at damper motor
  • Mechanical binding or broken damper gears preventing movement
  • Failed damper motor (electrical failure)
  • Damper motor wiring open/short
  • Faulty HVAC control module (less common)

Fault status

⚠️ Status
Malfunction detected in right/rear air outlet changeover damper motor circuit — possible motor, wiring, connector or HVAC control module fault. Action: inspect wiring/connectors, verify actuator operation, repair or replace faulty components.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1060 B1074 B1076 B1080 B1100
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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