Ambient Temperature Display System [06/2018 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Air Conditioner / Trouble Codes.
5. Check for DTCs.

   Body Electrical > Air Conditioner > Trouble Codes 

   Result

   Result	Proceed to
   DTC B1412 is not output	A
   DTC B1412 is output	B

Result: 

B 

GO TO DTC B1412. Refer to  DTC B1412: Ambient Temperature Sensor Circuit [06/2018 - ]  

Result: 

A 

See step  2

1. Remove the thermistor assembly.

   Refer to REMOVAL [06/2018 - 08/2021] , or refer to REMOVAL [08/2021 - 09/2022] , or refer to REMOVAL [09/2022 - ]

2. Inspect the thermistor assembly.

   Refer to INSPECTION [06/2018 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE THERMISTOR ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

Result: 

OK 

See step  3

1. Disconnect the G40 air conditioning amplifier assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A20-2 - G40-13 (TAM)	Always	Below 1 Ω
   A20-1 - G40-2 (SG-2)	Always	Below 1 Ω
   A20-2 or G40-13 (TAM) - Other terminals and body ground	Always	10 kΩ or higher
   A20-1 or G40-2 (SG-2) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the cable from the negative (-) battery terminal and wait for at least 90 seconds.
   NOTE:

   After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

   Refer to INITIALIZATION [06/2018 - 10/2019] , or refer to INITIALIZATION [10/2019 - 08/2020] , or refer to INITIALIZATION [08/2020 - 08/2021] , or refer to INITIALIZATION [08/2021 - 09/2022] , or refer to INITIALIZATION [09/2022 - ]

   HINT: 

   The air conditioning amplifier assembly stores the value of the last ambient temperature detected by the thermistor assembly before the engine switch was turned off for up to 1 hour after the engine switch is turned off. It is necessary to clear this value.

2. Connect the cable to the negative (-) battery terminal.
3. Measure and make a note of the ambient temperature near the thermistor assembly using a thermometer.
   NOTE:

   • Perform the following procedure with the engine switch on (IG).
   • Wait at least 6 minutes for the values of the thermistor assembly and thermometer to become stable before taking a measurement.
   • Hold the thermometer 50 mm (1.97 in.) from the thermistor assembly with its sensing portion at the same height and perpendicular to the thermistor assembly.
   • Hold the sensor only by its connector. Touching the sensing portion may change the resistance value.
   • When measuring the ambient temperature with a thermometer, do not move the thermometer, touch the sensing portion or allow it to contact the vehicle body.
4. Make a note of the ambient temperature displayed on the multi-information display in the combination meter assembly.
5. Compare the value of the ambient temperature measured by the thermometer and the thermistor assembly.

   OK

   The value of the ambient temperature measured by the thermometer and the thermistor assembly are almost the same.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END 

Result: 

NG 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - ]