Test D: DTC B2784 or DTC B2783 - A/C Humidity Sensor Open Circuit or Short to Ground

PINPOINT TEST D: DTC B2784 OR DTC B2783 - A/C HUMIDITY SENSOR OPEN CIRCUIT OR SHORT TO GROUND

D1-D2:

D2-D4:

D5-D7:

D7-D9:

D10:

Normal Operation
Under normal operation, the A/C humidity sensor is grounded through circuit RH111 (GY/BU). A 5-volt reference voltage is supplied to the A/C humidity sensor from the electronic automatic temperature control (EATC) module through circuit VH413 (WH/BU). The EATC module receives the humidity value through circuit LH115 (WH).

Possible Causes
- An open in circuit RH111 (GY/BU), VH413 (WH/BU) or LH115 (WH)
- A short together in circuit RH111 (GY/BU) and LH115 (WH)
- A short to ground in circuit LH115 (WH)
- A short to voltage in circuit VH413 (WH/BU)
- A/C humidity sensor
- EATC module