STEP
INSPECTION
ACTION
1
• Inspect the ambient temperature sensor. (See AMBIENT TEMPERATURE SENSOR INSPECTION [FULL-AUTO AIR CONDITIONER].)
• Is it normal?
Yes
Go to the next step.
No
Replace the ambient temperature sensor. (See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
2
• Disconnect the climate control unit connector and the ambient temperature sensor connector.
• Is there an open circuit in the wiring harness between the following terminals of the climate control unit and the ambient temperature sensor?
-
― L—B― C—A
Yes
Repair the wiring harness.
No
Go to the next step.
3
• Is there a short circuit to ground in the wiring harness between climate control unit terminal L and ambient temperature sensor terminal B?
Yes
Repair the wiring harness.
No
Connect the climate control unit connector, then go to the next step.
4
• Turn the ignition switch to the ON position.
• Inspect the voltage at the following climate control unit terminal (wiring harness-side).
-
― Terminal L (ambient temperature sensor input signal)
• Is the voltage normal? (Approx. 5 V)
Yes
The system is normal at present. (Clear the malfunction from the memory.)
No
Inspect the connection of the climate control unit connector. (See CLIMATE CONTROL UNIT INSPECTION [FULL-AUTO AIR CONDITIONER].)
