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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)
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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
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1 | • Disconnect climate control unit connector (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 the 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 the next step.
3 | • Is there short circuit to ground between terminal 1B of climate control unit connector (24-pin) and terminal A (L.H.D.) or B (R.H.D.) of air mix actuator connector? | Yes | Repair wiring harness.
No | Go to the 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.