Ambient Temperature Display System [12/2019 - 10/2022]: Procedure

1. Clear the DTCs.

   Body Electrical > Air Conditioner > Clear DTCs 

2. Check for DTCs.

   Body Electrical > Air Conditioner > Trouble Codes 

   NOTE:

   During the parked vehicle inspection, perform the inspection with the ignition switch ON (do not start the engine and electric motor).

   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 [12/2019 - 10/2022]  

Result: 

A 

See step  2

Refer to INSPECTION [12/2019 - ]

Result

Result: 

NG 

REPLACE AMBIENT TEMP. SENSOR (THERMISTOR ASSEMBLY). Refer to  REMOVAL [12/2019 - 09/2020]  , or refer to  REMOVAL [09/2020 - 10/2021]  , or refer to  REMOVAL [10/2021 - 11/2023] 

Result: 

OK 

See step  3

1. Disconnect the H63 air conditioning amplifier assembly connector.
2. Disconnect the A23 ambient temp. sensor (thermistor assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H63-1 (TAM) - A23-2	Always	Below 1 Ω
   H63-14 (SG-2) - A23-1	Always	Below 1 Ω
   H63-1 (TAM) or A23-2 - Other terminals and body ground	Always	10 kΩ or higher
   H63-14 (SG-2) or A23-1 - 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

HINT: 

The air conditioning amplifier assembly reads and memorizes the ambient temp. sensor (thermistor assembly) detection value (THO) from before the ignition switch was turned off for 1 hour after turning the ignition 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 ignition switch was turned off.

1. Turn the ignition switch off and wait for 6 minutes or more.
   NOTE:

   • Make sure that the wire harness(es) and connector(s) for the vehicle being inspected are connected.
   • After the ignition 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 (-) battery terminal after confirming that 6 minutes or more have elapsed since turning the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal and wait for at least 90 seconds.
3. Connect the cable to the negative (-) battery terminal.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Turn the ignition switch to ON and wait for 6 minutes or more.
   NOTE:

   Wait at least 6 minutes for the values of the ambient temp. sensor (thermistor assembly) and thermometer to become stable before taking a measurement.

2. Measure and make a note of the ambient temperature near the ambient temp. sensor (thermistor assembly) using a thermometer.
   NOTE:

   • Hold the thermometer 50 mm (1.97 in.) from the ambient temp. sensor (thermistor assembly) with its sensing portion at the same height and perpendicular to the ambient temp. sensor (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.
3. Make a note of the ambient temperature displayed on the multi-information display in the combination meter assembly.
4. Compare the values of the ambient temperature measured by the thermometer and the ambient temp. sensor (thermistor assembly).

   OK

   The values of the ambient temperature measured by the thermometer and the ambient temp. sensor (thermistor assembly) are almost the same.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END 

Result: 

NG 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]