DTC 12 [FULL-AUTO AIR CONDITIONER]

id0702c1802700

DTC 12

Ambient temperature sensor (present malfunction)
DETECTION CONDITION
•  The ambient temperature signal input from the ambient temperature sensor is -50 °C {58 °F} or less, or 100 °C {212 °F} or more.
POSSIBLE CAUSE
•  Ambient temperature sensor malfunction
•  Instrument cluster malfunction
•  Open or short circuit in wiring harness between ambient temperature sensor and instrument cluster
•  Open or short circuit in wiring harness between instrument cluster and climate control unit
•  Climate control unit malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION
1
INSPECT FOR INSTRUMENT CLUSTER DTCs
•  Connect the M-MDS to the DLC-2.
•  Inspect for instrument cluster DTCs.
•  Is DTC P0070:14 output?
Yes
Perform the corresponding DTC inspection.
(See DTC TABLE [INSTRUMENT CLUSTER].)
No
Go to the next step.
2
VERIFY INSTRUMENT CLUSTER CONNECTOR CONDITION
•  Switch the ignition to off.
•  Disconnect the instrument cluster connector.
•  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 connector or terminal.
After repair procedure, go to Step 6.
3
VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION
•  Disconnect the climate control unit connector.
•  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 connector or terminal.
After repair procedure, go to Step 6.
4
INSPECT SERIAL COMMUNICATION CIRCUIT FOR OPEN CIRCUIT
•  Inspect the wiring harness between instrument cluster connector terminal 2I and climate control unit connector terminal T.
•  Is there continuity?
Yes
Go to the next step.
No
Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to Step 6.
5
INSPECT SERIAL COMMUNICATION CIRCUIT FOR SHORT CIRCUIT
•  Inspect the wiring harness for continuity between climate control unit connector terminal T and body ground.
•  Is there continuity?
Yes
Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to Step 6.
No
Go to the next step.
6
VERIFY THAT SAME DTC IS NOT OUTPUT
•  Reconnect the disconnected connectors.
•  Verify DTCs.
•  Is DTC 12 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.
7
VERIFY THAT NO OTHER DTCs ARE PRESENT
•  Verify other DTCs displayed.
•  Are any other DTCs output?
Yes
Perform the corresponding DTC inspection.
No
DTC troubleshooting completed.