W/Harness Inspection

Air Conditioner

Air Conditioner - B1208 Intake Potentiometer Open (Low) - 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 of Vehicle Repair" procedure
NO
1) Go to "W/Harness Inspection" procedure

Signal Circuit Inspection

Check for open in harness
1. Ignition "OFF"
2. Disconnect Intake potentiometer
3. Measure resistance between terminal "6" of Intake potentiometer and terminal "24" of A/C control unit.
A. Specification : Approx. 0 Ohms




4. Is the measured resistance within specifications?
YES
1) Go to "Check for short to ground in harness" procedure.
NO
1) Check for open in signal harness. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for short to ground in harness
1. Ignition "OFF"
2. Disconnect Intake potentiometer
3. Measure resistance between terminal "6" of Intake potentiometer and chassis ground
A. Specification : Approx. Infinity Ohms




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

Power Supply Circuit Inspection

Check for short or open in harness
1. Ignition "ON"
2. Connect Intake potentiometer
3. Measure voltage between terminal "7" of Intake potentiometer and chassis ground.
A. Specification : Approx.5 V




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