Code
B132A
Generic
B — Body
Passenger Compartment Temperature Sensor Circuit - Open/Short
AI status
Completed
Completed
100%
Causes
- Open or shorted sensor wiring (broken conductor, pinched harness)
- Corroded, loose or contaminated sensor connector
- Failed passenger compartment temperature sensor (thermistor)
- Short to battery voltage or to ground in the harness
- Water intrusion or physical damage at sensor or connector
- Faulty body control module (BCM)/HVAC control input (rare)
Symptoms
- Auto HVAC may not regulate cabin temperature correctly
- Incorrect or erratic cabin temperature readings on HVAC display
- Blower or A/C cycling behavior may change
- Possible stored B132A fault lamp or HVAC warning (depending on vehicle)
- No heat/cool control in automatic mode (manual mode may still work)
What to check
- Confirm B132A is current and note freeze-frame/live data if available
- Visual inspection of sensor location, connector, and wiring for damage or corrosion
- Check connector pins for proper seating and corrosion; wiggle test the harness
- Measure sensor circuit voltage at the connector with ignition on (backprobe)
- Measure sensor resistance at ambient temperature (with harness disconnected)
- Check continuity between sensor connector and BCM connector and for shorts to ground/12V
Signal parameters
- Sensor type: typically NTC thermistor (resistance decreases as temperature rises)
- Typical resistance at ~25°C: commonly in the low kΩ range (example 2–30 kΩ depending on vehicle) — consult service manual
- Open-circuit: very high resistance (>>100 kΩ) or OL on meter
- Short-circuit: near 0 Ω
- Signal voltage to BCM: generally 0–5 V range; mid-range voltage corresponds to mid-range temperature (check vehicle spec)
Diagnostic algorithm
- Retrieve freeze-frame and live data, then clear the code and attempt to reproduce. Confirm code returns.
- Perform a visual inspection of the passenger compartment temperature sensor, mounting, and wiring harness for damage, corrosion, or water intrusion.
- With ignition off, disconnect the sensor harness. Inspect terminals for corrosion, bent pins, or debris.
- Measure sensor resistance with a multimeter across the sensor terminals at ambient temperature. Compare to manufacturer specification or expected NTC behavior (resistance should change with temperature).
- Backprobe the sensor connector with ignition ON and measure reference voltage and signal voltage to the BCM. Verify voltages are within expected 0–5 V range and change when sensor is warmed/cooled.
- Check continuity between the sensor connector and the BCM input pin. Verify no short to battery positive or ground using an ohmmeter.
- If wiring and connector check good but readings are out of range, substitute a known-good sensor or simulate sensor with appropriate resistor value to verify BCM response.
- Repair or replace wiring, connector, or sensor as required. Protect and reseal connectors if water intrusion is present.
- After repair, clear codes and verify repair by rechecking live data and ensuring code does not return under normal operating conditions.
Likely causes
- Damaged or disconnected harness between sensor and BCM
- Corroded connector at the sensor
- Failed sensor element (open circuit or shorted thermistor)
- Short to ground or to 12V from chafed wiring
- Connector pin pushed out or poor terminal contact
Fault status
Status
Passenger Compartment Temperature Sensor Circuit — Open/Short detected. HVAC automatic climate control input may be invalid.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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