3.
Has a problem been found?
YES
a.
Repair as necessary and go to "Verification Vehicle Repair" procedure.
NO
a.
Go to "W/Harness Inspection" procedure.
Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
YES
Repair as necessary and go to "Verification Vehicle Repair" procedure.
NO
Go to "W/Harness Inspection" procedure.
Check for short to ground in harness.
Ignition "OFF".
Disconnect Humidity Sensor.
Measure resistance between terminal "3" of Humidity Sensor and chassis ground.
Specification :Approx. ∞ Ω
Is the measured resistance within specifications?
YES
Go to "Power circuit Inspection " procedure.
NO
Check for short to ground in harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for open in harness.
Ignition "ON".
Connect Humidity sensor.
Measure resistance between terminal "5" of Humidity Sensor and terminal "1" of A/C Control Unit.
Specification :Approx. 0 Ω
Is the measured resistance within specifications?
YES
Go to "Check for short in harness " procedure.
NO
Check for open in harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for short in harness.
Ignition "ON".
Connect Humidity sensor.
Measure resistance between terminal "5" of Humidity Sensor and chassis ground.
Specification :Approx. ∞ Ω
Is the measured resistance within specifications?
YES
Go to "Ground circuit Inspection " procedure.
NO
Check for short in harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for open in ground harness.
Ignition "OFF".
Disconnect Humidity Sensor.
Measure resistance between terminal "2" of Humidity Sensor and terminal "12" of A/C Control Unit.
Specification :Approx. 0 Ω
Is the measured resistance within specifications?
YES
Go to "Component Inspection " procedure.
NO
Check for open in ground harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
