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Home / DTC / B150714 — Inside Temperature Sensor Sun Sensor. Circuit Short To Ground or Open

B150714 — Inside Temperature Sensor Sun Sensor. Circuit Short To Ground or Open

Detailed page for trouble code B150714.

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Code

B150714

VOLVO B — Body

Inside Temperature Sensor Sun Sensor. Circuit Short To Ground or Open

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

Causes

  • Broken or chafed wiring in the sensor harness
  • Corroded, loose, or pushed-back connector pins at the sensor or module
  • Damaged or failed inside temperature / sun sensor
  • Water intrusion or contamination of sensor or connector
  • Faulty climate control module or internal driver fault
  • Aftermarket equipment or previous repairs that disturbed wiring

Symptoms

  • Auto climate control works poorly or fails to regulate cabin temperature correctly
  • HVAC system runs at incorrect fan speeds or runs continuously
  • Cabin temperature displays incorrect values or sensor reading not available
  • DTC stored; possible warning or message on cluster/infotainment about climate control

What to check

  • Read DTC(s) and freeze-frame data with a capable Volvo scan tool; note conditions when fault set
  • Visually inspect sensor (usually on top of the dash near windshield) and wiring for damage, corrosion or water entry
  • Unplug sensor connector and inspect pins for corrosion, bent or broken terminals
  • Measure voltage at the sensor connector with ignition on (compare to manufacturer spec — typically a reference voltage and a signal voltage)
  • Measure continuity/resistance of the sensor leads to the climate control module and to ground to detect opens or shorts
  • Wiggle test the harness while watching live data for signal changes or fault reappearance

Signal parameters

  • Reference/power supply: typically 5 V or vehicle-supplied reference (verify with service data)
  • Signal output: typically 0–5 V proportional to sun load or light level; open circuit → no signal/high impedance, short to ground → ~0 V
  • Sensor resistance (if thermistor type): varies with temperature; check exact ohm-temperature chart in service data
  • Expected idle/normal values: mid-range voltage (~2–3 V) at moderate sunlight; verify with manufacturer specifications

Diagnostic algorithm

  1. Confirm the fault: Clear codes, operate vehicle under the same conditions, and see if B150714 returns. Record freeze-frame and live data.
  2. Identify sensor location and inspect visually for physical damage, contamination or water ingress. Replace or dry/clean connector if contaminated.
  3. With ignition ON (engine off per service manual), backprobe the sensor connector. Verify reference voltage and ground presence at the connector.
  4. Measure the sensor signal voltage while exposing the sensor to changing light/temperature (shade vs direct sunlight). Signal should change smoothly within expected range.
  5. If signal is stuck at 0 V or near ground, suspect short-to-ground: disconnect sensor and check continuity from the signal pin to chassis ground. Repair wiring if continuity to ground is present where it should not be.
  6. If signal is open (no reference or no signal), check continuity between the sensor connector and the climate control module connector. Repair open wire/connector as needed.
  7. If wiring and connector are good, measure sensor resistance or bench-test sensor per service data. Replace sensor if out-of-spec.
  8. After repair, clear codes and verify proper operation with live data and road test. If fault persists and wiring/sensor verified, suspect module fault and refer to module-level diagnostics or replacement.

Likely causes

  • Open circuit in the sensor lead (wire broken or disconnected)
  • Short to ground where insulation is worn through or connector pin is touching vehicle ground
  • Corroded connector causing intermittent contact or high resistance
  • Failed sensor element (photodiode/thermistor) out-of-spec

Fault status

⚠️ Status
Inside temperature / sun sensor circuit open or shorted to ground detected by climate control module. Sensor signal is invalid; HVAC automatic function may be degraded.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-1.5 hours

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