B018A - Windscreen Temperature Sensor Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

B018A Possible Causes

  • Faulty Windscreen Temperature Sensor
  • Windscreen Temperature Sensor harness is open or shorted
  • Windscreen Temperature Sensor circuit poor electrical connection
  • Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

How do I fix code B018A?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
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Tech Notes

B018A 02: Windscreen Temperature Sensor Circuit Short to Ground
B018A 05: Windscreen Temperature Sensor Circuit Short to Battery or Open

Cost of diagnosing the B018A code

Labor: 1.0

The cost of diagnosing the B018A code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

B018A Description

The windscreen temperature and inside moisture sensor integrates the relative humidity sensor, windscreen temperature sensor and humidity sensing element temperature sensor. This sensor assembly provides information about relative humidity level on inside windscreen, temperature of the inside windscreen and temperature of the humidity sensor element.
The relative humidity sensor measures the relative humidity on the compartment side of the windscreen. It also detects the temperature of the windscreen surface on the compartment side. Both values are used as control inputs for the Heating, Ventilation, and Air Conditioning (HVAC) Control Module application to calculate the fog risk on windscreen compartment side and ability to reduce fuel consumption by decreasing A/C compressor power to a minimum without causing any fog. The sensor will also enable partial recirculation mode in order to improve heat-up performance of the passenger compartment under cold ambient temperature conditions without the risk of mist build-up on the windscreen. The humidity sensor element temperature sensor supplies the temperature of the humidity sensor element. It is only needed if the thermal contact between the humidity sensing element and the inside windscreen surface is not sufficient.
OBDII Code B018a - Windscreen Temperature Sensor Circuit - AutoCodes.com

More Information

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