B1604 Code failures by brands


Description of DTC code B1604

The Solar Sensor is a device that is installed on the top of the instrument panel. Its purpose is to detect sunlight so that the A/C (Air Conditioning) AUTO mode can be controlled. The Solar Sensor has variations in its output voltage, depending on the sunlight. If the light level is high, the voltage tends to increase. If the light level decreases, the voltage also decreases.

The HVAC (Heating, Ventilation, and Air Conditioning Module) adjusts the operation of these systems by using the information provided by several sensors, including the Solar Sensor. If the input voltage of this device is out of range towards the low voltage threshold, the B1604 OBDII fault code will be set.

Symptoms of fault code B1604

Causes of OBD2 B1604

Reasons to set the B1604 OBD2 diagnostic code:

  • The wiring related to the Solar Sensor may be faulty.
  • Electrical connections of the Solar Sensor circuit may be damaged, which results in low voltage.
  • Possibly, the Solar Sensor is defective.
  • The HVAC Module may be damaged.

Possible solutions of the DTC code B1604

To resolve the DTC B1604 OBDII code, try this:

  • Consult the TSBs as a first step.
  • Check all the cables related to the Solar Sensor for damage caused by corrosion or wear. If you find these conditions, make the right corrections.
  • Make electrical tests on the Solar Sensor circuit to check the Solar Sensor circuit connections for deficiencies that cause the low voltage. Repair if necessary.
  • Check the condition of the Solar Sensor. For these checks, take into account the manufacturer's recommended diagnostic steps. If you determine that the sensor is defective, consider replacing it.

Codes related to B1604

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