DTC 02, 18, 21 (WHEN TWO OR MORE DTCS ARE INDICATED AT THE SAME TIME)

id070200811800

DTC 02, 18, 21

Climate control unit (+5 V power supply) inspection

POSSIBLE CAUSE

• Climate control unit malfunction
• Short circuit between climate control unit and solar radiation sensor
• Short circuit between climate control unit and air mix actuator
• Short circuit between climate control unit and airflow mode actuator
• Open circuit between climate control unit and solar radiation sensor
• Open circuit between climate control unit and air mix actuator
• Open circuit between climate control unit and airflow mode actuator

Diagnostic Procedure

STEP

INSPECTION

ACTION

1
• Disconnect climate control unit cooonnector (24-pin) and airflow mode actuator connector.
• Is there continuity between terminal 1B of climate control unit connector (24-pin) and terminal B of airflow mode actuator connector?
Yes
Go to next step.
No
Repair wiring harness.
2
• Is there short circuit to ground between terminal 1B of climate control unit connector (24-pin) and terminal B of airflow mode actuator connector?
Yes
Repair wiring harness.
No
Go to next step.
3
• Is there short circuit to ground between terminal 1B of climate control unit connector (24-pin) and terminal B of air mix actuator connector?
Yes
Repair wiring harness.
No
Go to next step.
4
• Is there short circuit to ground between terminal 1B of climate control unit connector (24-pin) and terminal A of solar radiation sensor connector?
Yes
Repair wiring harness.
No
Replace climate control unit.