Ambient Temperature Display System [10/2018 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power 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
   B1412 is not output	A
   B1412 is output	B

Result: 

B 

GO TO DTC B1412. Refer to  DTC B1412: Ambient Temperature Sensor Circuit [10/2018 - ] 

Result: 

A 

See step  2

1. Remove the thermistor assembly.

   Refer to REMOVAL [10/2018 - ]

2. Inspect the thermistor assembly.

   Refer to INSPECTION [10/2018 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE THERMISTOR ASSEMBLY. Refer to  REMOVAL [10/2018 - ] 

Result: 

OK 

See step  3

1. Disconnect the F50 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
   A9-1 (+) - F50-13 (TAM)	Always	Below 1 Ω
   A9-2 (-) - F50-2 (SG-2)	Always	Below 1 Ω
   A9-1 (+) or F50-13 (TAM) - Other terminals and body ground	Always	10 kΩ or higher
   A9-2 (-) or F50-2 (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 (-) auxiliary battery terminal and wait for at least 90 seconds.
   NOTE:

   Make sure the wire harness(es) and connector(s) for the vehicle being inspected are connected. After the power switch is turned off, the navigation system stores the various memory and settings within approximately 6 minutes. Therefore, make sure to disconnect the cable from the negative (-) auxiliary battery terminal after confirming that 6 minutes or more have elapsed since turning the power switch off.

   HINT: 

   The air conditioning amplifier assembly reads and memorizes the thermistor assembly (ambient temperature sensor) detection value (THO) from before the power switch was turned off for 1 hour after turning the power switch off. Therefore, it is necessary to switch off the air conditioning amplifier assembly internal power source and clear the stored values from before the power switch was turned off.

2. Connect the cable to the negative (-) auxiliary 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 power 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 [10/2018 - 07/2022]  , or refer to  REMOVAL [07/2022 - ]