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Home / DTC / B1007 — Rear inside TEMP. sensor high

B1007 — Rear inside TEMP. sensor high

Detailed page for trouble code B1007.

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Code

B1007

MITSUBISHI B — Body

Rear inside TEMP. sensor high

Brand: MITSUBISHI
Type: B — Body
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Page language: EN

Causes

  • Faulty rear inside temperature (cabin) sensor (thermistor)
  • Open or high-resistance connection in sensor wiring
  • Short to battery voltage (12V) on sensor signal wire
  • Corroded or disconnected connector at sensor or HVAC control module
  • Water intrusion or physical damage to sensor
  • Faulty HVAC/body control module or software error

Symptoms

  • Rear/second-zone temperature reading incorrect (shows very high temperature or out-of-range)
  • Automatic climate control not regulating rear zone properly
  • HVAC blower/air distribution may not behave as expected for rear zone
  • DTC B1007 stored and may illuminate a warning or affect climate functions
  • Intermittent or constant fault present depending on wiring condition

What to check

  • Scan vehicle and confirm B1007 is current; record freeze-frame and live data for rear temp sensor
  • Visually inspect sensor location (rear interior) and connector for corrosion, water, damage, or loose pins
  • Check wiring harness along the route for chafing, pinches, or repairs
  • Backprobe sensor connector and observe signal voltage with ignition ON and with changes in cabin temperature
  • Measure sensor resistance at connector (with sensor disconnected) and compare to expected trend (resistance should change with temperature)
  • Wiggle wiring and connectors while monitoring live data to reproduce the fault

Signal parameters

  • Sensor type: typically an NTC thermistor (resistance decreases as temperature rises)
  • Expected behavior: resistance should change smoothly with cabin temperature; consult service manual for exact resistance/temperature table
  • Typical signal voltage range (depending on circuit): approx. 0.2–4.8 V — varies by vehicle and pull-up/pull-down resistor in control module
  • If sensor circuit shows near-battery voltage (≈12V) or stuck high, suspect short to power; if open/infinite resistance, suspect open circuit or failed sensor

Diagnostic algorithm

  1. Read and record B1007 and any related HVAC/body codes. Note freeze frame and live data for the rear temp sensor.
  2. Perform a visual inspection of the rear inside temperature sensor and harness (connectors, moisture, damage). Repair obvious issues.
  3. With ignition ON, backprobe the sensor connector and measure signal voltage while observing live data. Compare to expected behavior (should vary with temperature).
  4. Remove sensor and measure resistance vs ambient temperature. Compare to manufacturer resistance/temperature chart (resistance should change with temperature).
  5. If resistance is out of range or open, replace sensor and clear codes. Re-test.
  6. If sensor resistance is correct but signal voltage is high, inspect wiring for short to battery voltage; disconnect sensor and check if voltage is present on signal line — presence of 12V indicates short to power.
  7. Check continuity and shorts: perform resistance check to ground and battery; look for short-to-power or open circuits.
  8. If wiring and sensor check good, test/replace HVAC/body control module or related connectors per service manual. Reprogram or calibrate if required.
  9. After repairs, clear codes, cycle HVAC functions and verify fault does not return and rear temperature readings are normal.

Likely causes

  • Sensor failed (open or out-of-spec resistance)
  • Connector pins corroded or pushed out leading to poor contact
  • Wiring shorted to 12V causing high signal voltage
  • Broken/shorted wire between sensor and control module
  • Ground circuit high resistance or poor ground at module

Fault status

⚠️ Status
Rear inside temperature sensor circuit reports a high/out-of-range signal to the HVAC control module (sensor reads hotter than expected or electrical fault present).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

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B1006 B1008 B1012 P0113 P0118
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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