In-Vehicle Sensor (Auto A/C Model): Inspection

Set the vehicle to the following conditions.

Item	Condition
Ignition switch	ON
A/C switch	ON
Temperature adjustment dial	HI (MAX HOT)
Air flow control dial or switch	DEF
Fan dial	HI (MAX)

Check the suction port (A) for in-vehicle sensor of the cover assembly - instrument panel LWR driver INN.

Fig 1: Identifying Cover Assembly In-Vehicle Sensor Suction Port
Courtesy of SUBARU OF AMERICA, INC.
1. Put a strip of paper close to the front side of the suction port (A).
2. Can you see the paper moving towards the port and the air being sucked into the port?
  CAUTION: Be careful not to let the paper get sucked into the port.
  - Yes → Go to step 5.
  - No → Go to step 3.
Remove the cover assembly - instrument panel LWR driver INN, and check the aspirator hose (A).

Fig 2: Identifying Cover Assembly Aspirator Hose
Courtesy of SUBARU OF AMERICA, INC.
1. Are the aspirator hoses on both sides of the case and sensor connected securely?
2. Is the aspirator hose free from any kinks or cracks?
  - Yes → Go to step 4.
  - No → Repair or replace the aspirator hose if necessary.
Check if there is anything that affects sensing, around the in-vehicle sensor.
1. Is the in-vehicle sensor hole free from clogging?
2. Is the peripheral area of in-vehicle sensor free from any heat-producing parts (such as audio, navigation system etc.)?
  - Yes → Go to step 5.
  - No → Remove everything that affects sensing.

Perform the inspection of in-vehicle sensor unit.

Measure the resistance between connector terminals.

CAUTION: During inspection, be careful not to touch the sensor end in order to avoid misjudgment due to body temperature.

Preparation tool:

Circuit tester

Fig 3: Checking In-Vehicle Sensor Unit Connector Terminals Resistance

Courtesy of SUBARU OF AMERICA, INC.

Is the resistance within the standard?
- Yes → The in-vehicle sensor is normal.
- No → Replace the in-vehicle sensor.