DTC 02, 18, 21 (WHEN TWO OR MORE DTCS ARE INDICATED AT THE SAME TIME) [FULL-AUTO AIR CONDITIONER]

id0702c1811800

DTC 02, 18, 21

+5 V power supply of the solar radiation sensor, air mix actuator, and airflow mode actuator (Present malfunction, multiple DTCs indicated)
DETECTION CONDITION
•  Approx. 5 V is not output to +5 V power supply circuit of the solar radiation sensor, air mix actuator, and airflow mode actuator.
POSSIBLE CAUSE
•  Open or short circuit in wiring harness between climate control unit and solar radiation sensor, air mix actuator, or airflow mode actuator
•  Climate control unit malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION
1
INSPECT AIR MIX ACTUATOR CIRCUIT FOR OPEN CIRCUIT
•  Turn the ignition switch to the ON position.
•  Measure the voltage of air mix actuator connector terminal E.
•  Is the voltage 5 V?
Yes
Go to Step 5.
No
Go to the next step.
2
INSPECT AIR MIX ACTUATOR CIRCUIT FOR OPEN CIRCUIT
•  Measure the voltage at climate control unit connector terminal X.
•  Is the voltage 5 V?
Yes
Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to Step 5.
No
Go to the next step.
3
INSPECT AIR MIX ACTUATOR CIRCUIT FOR SHORT CIRCUIT TO GROUND
•  Turn the ignition switch to the LOCK position.
•  Disconnect the climate control unit connector.
•  Inspect the wiring harness for continuity between air mix actuator connector terminal E and body ground.
•  Is there continuity?
Yes
Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to Step 5.
No
Go to the next step.
4
VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION
•  Inspect the connector and terminals. (corrosion, damage, pin disconnection)
•  Are the connector and terminals normal?
Yes
Go to the next step.
No
Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to the next stop.
5
VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN
•  Reconnect the disconnected connector.
•  Verify DTCs.
•  Are DTCs 02, 18, 21 output?
Yes
Repeat the inspection from Step 1.
•  If the malfunction does not recur, go to the next step.
•  If the malfunction recurs, replace the climate control unit.
No
Go to the next step.
6
VERIFY THAT NO OTHER DTCs ARE PRESENT
•  Verify other DTC displayed.
•  Are any other DTCs output?
Yes
Perform the corresponding DTC inspection.
No
DTC troubleshooting completed.