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Home / DTC / B1088 — A/M DMPR.motor driver (short)

B1088 — A/M DMPR.motor driver (short)

Detailed page for trouble code B1088.

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Code

B1088

MITSUBISHI B — Body

A/M DMPR.motor driver (short)

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

Causes

  • Short to battery voltage (B+) or to ground in the damper motor driver output circuit
  • Damper motor internal short or seizure
  • Damaged connector, corroded pins, or harness chafing causing a short
  • Failed motor driver (in HVAC control module or BCM)
  • Blown related fuse or relay fault causing abnormal voltages
  • Water intrusion or contamination at actuator or connector

Symptoms

  • HVAC vent mode or temperature blend not responding or stuck
  • Damper actuator does not move or moves erratically
  • Heating/AC not mixing properly (wrong cabin temperature or airflow direction)
  • Possible stored HVAC-related fault codes and malfunction indicator for HVAC

What to check

  • Visual inspection of damper motor, connector and wiring for damage, corrosion, or water
  • Check related fuses and relays for continuity and correct operation
  • Use a scan tool to read live data and attempt actuator tests (if available)
  • Measure voltage at the actuator connector with ignition ON during actuator command
  • Measure resistance of motor windings (with connector disconnected) to check for short/low resistance
  • Check for continuity to chassis ground and to battery positive to locate shorts

Signal parameters

  • Supply voltage to actuator: ~10–14 V with ignition ON (manufacturer-specific)
  • Control output: driver may use PWM or switched DC — expected 0–12 V duty range during operation
  • Motor coil resistance: typically low ohms to a few tens of ohms (exact value is vehicle-specific)
  • Short-fault condition: near 0 Ω to ground or near battery voltage present on control output when inactive

Diagnostic algorithm

  1. Retrieve freeze frame and related HVAC codes with a scan tool; note actuator status and any live data.
  2. Perform visual inspection of actuator, connector and wiring harness. Repair any obvious damage, corrosion, or moisture intrusion.
  3. With ignition OFF, disconnect the damper motor connector. Inspect pins for corrosion, bending, or signs of burning.
  4. Measure motor winding resistance at the disconnected connector. If resistance is extremely low (near short) or infinite (open), replace or repair actuator.
  5. With connector disconnected and ignition ON, measure voltage and signal at the control harness for shorts to B+ or ground. Look for unexpected constant B+ or ground on driver pins.
  6. If driver output is shorted when connected, trace wiring for shorts (remove sections of harness or use backprobe while operating to isolate the fault).
  7. If wiring checks good, command the actuator with a scan tool while monitoring driver output. If output remains shorted, suspect HVAC control module/driver electronics — consult manufacturer service procedures before module replacement.
  8. After repair, clear codes and verify actuator operation through full range and by repeating scan tool actuator tests; confirm code does not reappear.

Likely causes

  • Damper motor wiring shorted to ground or B+ (harness chafe, pin pushed out)
  • Damper motor internal short or locked rotor
  • HVAC control module / driver electronics failure

Fault status

⚠️ Status
Stored fault: A/M DMPR.motor driver short. The driver circuit for the air-mix damper actuator detected a short condition (to battery or to ground) or an internal driver/motor failure. Further electrical diagnosis required.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

B1087 B1089 B1090 B10A0 B1015
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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