W/Harness Inspection

Terminal and Connector Inspection

1. 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.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found ?
YES
1) Repair as necessary and go to "Verification Vehicle Repair" procedure.
NO
1) Go to "Signal Circuit Inspection" procedure.

Signal Circuit Inspection

1. Check for open in harness.
(1) Ignition "OFF".
(2) Disconnect Humidity Sensor.
(3) Measure resistance between terminal "3" of Humidity Sensor and terminal "4" of A/C Control Unit.
A. Specification: Approx. 0 Ohm




(4) Is the measured resistance within specifications ?
YES
1) Go to "Power Supply Circuit Inspection" procedure.
NO
1) Check for open in harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure.

Power Supply Circuit Inspection

1. Check for open in harness.
(1) Ignition "ON".
(2) Connect Humidity sensor.
(3) Measure resistance between terminal "5" of Humidity Sensor and terminal "1" of A/C Control Unit
A. Specification: Approx. 0 Ohm




(4) Is the measured resistance within specifications ?
YES
1) Go to "Check for short in harness" procedure.
NO
1) Check for open in harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
2. Check for short in harness.
(1) Ignition "ON".
(2) Connect Humidity sensor.
(3) Measure resistance between terminal "5" of Humidity Sensor and chassis ground.
A. Specification: Approx. Infinity Ohms




(4) Is the measured resistance within specifications ?
YES
1) Go to "Ground circuit Inspection" procedure.
NO
1) Check for short in harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure.

Ground Circuit inspection

1. Check for open in ground harness.
(1) Ignition "OFF".
(2) Disconnect Humidity Sensor.
(3) Measure resistance between terminal "2" of Humidity Sensor and terminal "12" of A/C Control Unit.
A. Specification: Approx. 0 Ohm




(4) Is the measured resistance within specifications ?
YES
1) Go to "Component Inspection" procedure.
NO
1) Check for open in ground harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure.