4.
Verify that the temperature actuator operates to the cool position when connecting in the reverse.
Ignition "OFF"
Disconnect DR Air Mix Potentiometor.
Verify that the temperature actuator operates to the hot position when connecting 12V to the terminal 1 and grounding terminal 2.
Verify that the temperature actuator operates to the cool position when connecting in the reverse.
Dose the actuator work properly?
YES
Go to "Check potentiometer" procedure.
NO
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.
Ignition "ON"
Connect DR Air Mix Actuator
Measure voltage between terminal "3" and "4" of DR AIR MIX potentiometer while operating the temp switch.
Specification : Refer the specifications in fig3)
Door position | Voltasge (3-4) | Error detecting |
MAX. Cooling | 0.3±0.15V | Low voltage : 0.08V or less |
MAX. Heating | 4.7±0.15V | High voltage : 4.9V or more |
Is the measured voltage within specifications in fig3)?
YES
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
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.
