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Home / DTC / B1052 — R.A/M damper potentiometer low

B1052 — R.A/M damper potentiometer low

Detailed page for trouble code B1052.

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Code

B1052

MITSUBISHI B — Body

R.A/M damper potentiometer low

Brand: MITSUBISHI
Type: B — Body
Views: UK: 25 EN: 30 RU: 31
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Page language: EN

Causes

  • Damper actuator potentiometer failed or worn
  • Potentiometer output shorted to ground
  • Open or shorted wiring between actuator and HVAC control module
  • Corroded, loose or pushed-back connector pins
  • Mechanical binding or seized damper that prevents correct potentiometer movement
  • Fault in HVAC control module (less common)

Symptoms

  • HVAC mode or blend not selecting or holding the requested position
  • Cabin temperature or air distribution incorrect or stuck
  • DTC B1052 stored in body/HVAC control module
  • Possible audible clicking/straining from actuator when commanded
  • Recirculation/mode indicators may behave erratically or not respond

What to check

  • Visual inspection of HVAC actuator and wiring harness for damage, corrosion or disconnected connectors
  • Use a scan tool to read live damper position/target values and attempt actuator self-test (sweep/oscillate)
  • Backprobe potentiometer signal, reference and ground with ignition on and HVAC powered
  • Manually move damper to confirm free movement and listen for binding or grinding
  • Check for related stored HVAC or body control module codes

Signal parameters

  • Reference supply voltage to potentiometer: typically ~5.0 V (key on, HVAC powered)
  • Potentiometer output (position signal): normally ~0.5–4.5 V depending on position; 'LOW' usually means below ~0.3–0.5 V
  • Ground: good chassis/ECU ground continuity required
  • End-to-end potentiometer resistance (typical): manufacturer-specific (commonly a few kΩ); resistance should change smoothly as actuator is moved

Diagnostic algorithm

  1. Retrieve freeze frame and related HVAC/body codes with a scan tool; record live data for damper target and actual position.
  2. Perform visual inspection: connectors, wiring harness, actuator mounting, and check for damaged insulation, corrosion, or pinch points.
  3. Attempt an actuator relearn or self-test via scan tool. Observe whether the damper moves and what position value is reported.
  4. Backprobe the potentiometer connector: verify reference voltage (≈5 V) and good ground with ignition ON and HVAC circuit powered.
  5. With connector attached, command the actuator through full travel while monitoring the potentiometer output. Verify the output changes smoothly across the range; if it remains low, suspect short to ground or failed potentiometer.
  6. If output is low, disconnect the actuator and measure resistance across potentiometer terminals. Compare to specification or verify that resistance changes when the shaft is turned manually.
  7. Inspect and wiggle wiring while monitoring the output to isolate an intermittent open/short. Repair any damaged wiring or connectors.
  8. Check that the damper can be moved by hand through full travel with actuator removed; repair or replace if mechanically bound.
  9. If wiring and actuator check good, test or replace HVAC/control module connectors and grounds; as a last step consider replacing the damper actuator assembly and then clear codes and retest.
  10. After repairs, clear DTCs and perform a full HVAC actuator self-test and confirm proper operation and code-free status.

Likely causes

  • Failed/dirty potentiometer inside damper actuator
  • Damper actuator connector corroded or pins pushed out
  • Wiring short to ground on potentiometer signal circuit
  • Damper mechanically jammed preventing potentiometer travel

Fault status

⚠️ Status
Control module detected R.A/M damper potentiometer output below allowable threshold (LOW). System flags improper position feedback for the right air/mode damper.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

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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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