Ambient Temperature Display System [11/2023 - ]: Procedure

1. Check for DTCs.

   Body Electrical > Air Conditioner > Trouble Codes 

   Result

   Result	Proceed to
   DTC P0070-11 and P0070-15 are not output	A
   DTC P0070-11 is output	B
   DTC P0070-15 is output	C

Result: 

B 

GO TO DTC P0070-11 

Refer to DTC P0070-11: Ambient Temperature Sensor Circuit Short to Ground [11/2023 - ]

Result: 

C 

GO TO DTC P0070-15 

Refer to DTC P0070-15: Ambient Temperature Sensor Circuit Short to Battery or Open [11/2023 - ]

Result: 

A 

See step  2

Refer to INSPECTION [12/2019 - ]

Result

Result: 

NG 

REPLACE AMBIENT TEMP. SENSOR (COOLER THERMISTOR) 

Refer to REMOVAL [11/2023 - ]

Result: 

OK 

See step  3

1. Disconnect the H63 air conditioning amplifier assembly connector.
2. Disconnect the A23 ambient temp. sensor (cooler thermistor) 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
   H63-15 (SG-4) - A23-1	Always	Below 1 Ω
   H63-1 (TAM) or A23-2 - Other terminals and body ground	Always	10 kΩ or higher
   H63-15 (SG-4) 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 (cooler thermistor) 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.
   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, there may be a waiting time before disconnecting the negative (-) auxiliary battery terminal.

     Refer to BEFORE DISCONNECTING BATTERY [11/2023 - ]

     HINT: 

     When disconnecting and reconnecting the auxiliary battery, there is an automatic learning function that completes learning when the respective system is used.

     Refer to AUTOMATIC LEARNING CHART [11/2023 - ]

2. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.
3. Connect the cable to the negative (-) auxiliary 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 (cooler thermistor) and thermometer to become stable before taking a measurement.

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

   • Hold the thermometer 50 mm (1.97 in.) from the ambient temp. sensor (cooler thermistor) with its sensing portion at the same height and perpendicular to the ambient temp. sensor (cooler thermistor).
   • 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 (cooler thermistor).

   OK

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

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END 

Result: 

NG 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

Refer to REMOVAL [11/2023 - ]