Component Inspection

Component Inspection

Check actuator motor
1. Ignition "OFF"
2. Disconnect DR Air Mix Potentiometer.
3. Connect (+) terminal of battery to terminal 3 of DR Air Mix Actuator and (-) terminal to terminal 4
4. Verify that the mode actuator operates to the hot position
5. Verify that the mode actuator operates to the cool position with reverse connecting. ((+) to 4 and (-) to 3)




6. Dose the actuator work properly ?
YES
1) Go to "Check potentiometer" procedure.
NO
1) Substitute with a known-good actuator and check for proper operation. If the problem is corrected, replace actuator and then go to "Verification of Vehicle Repair" procedure.
Check potentiometer
1. Ignition "ON"
2. Connect DR Air Mix Actuator
3. Measure voltage between terminal "5" and "6" of DR AIR MIX potentiometer while operating the temp switch.
A. Specification : Refer the specifications in fig 5)













4. Is the measured voltage within specifications in fig 3) ?
YES
1) Go to "Check A/C Control Unit" procedure
NO
1) Substitute with a known-good actuator and check for proper operation. If the problem is corrected, replace actuator and then go to "Verification of Vehicle Repair" procedure.
Check A/C Control Unit
1. Engine "ON"
2. Connect A/C Control Unit.
3. Measure voltage between terminal "16" and "17" of A/C Control Unit while operating the temp switch.
A. Specification : Approx. 12V




4. Is the measured voltage within specifications ?
YES
1) Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
NO
1) Substitute with a known-good A/C Control Unit and check for proper operation. If the problem is corrected, replace A/C Control Unit and then go to "Verification of Vehicle Repair" procedure.