DTC    B1462/62    Room Humidity Sensor Circuit

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DESCRIPTION

The A/C room humidity sensor detects cabin humidity. The voltage of the A/C room temperature sensor changes in accordance with cabin humidity. The A/C amplifier assembly reads changes in the A/C room humidity sensor.
The A/C room humidity sensor is integrated with the A/C room temperature sensor.

DTC No.
DTC Detecting Condition
Trouble Area
B1462/62
Open or short in room humidity sensor circuit
  1. A/C room humidity sensor (A/C room temperature sensor)
  2. Harness or connector between A/C room humidity sensor (A/C room temperature sensor) and A/C amplifier assembly
  3. A/C amplifier assembly

WIRING DIAGRAM


E108928E06


INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch ON and push the intelligent tester main switch on.

  1. Select the item below in the DATA LIST, and read the display on the intelligent tester.


DATA LIST / AIR CONDITIONER 
Item
Measurement Item/Display
(Range)
Normal Condition
Diagnostic Note
HUMIDITY SENS
Humidity sensor / min.: 0% max.: 100%
Actual cabin humidity is displayed
-

OK:
The display is as specified in the normal condition.


Result:

Result
Proceed to
NG
A
OK (Checking from the PROBLEM SYMPTOMS TABLE)
B
OK (Checking from the DTC)
C



B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
A


2.INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY


    E109265E28

  1. Remove the A/C amplifier assembly with the connectors still connected.

  1. Measure the voltage according to the value(s) in the table below.

    Voltage:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    A11-22 (RH) - A11-24 (SSR+)
    		Ignition switch ON
    at 25°C (77°F)
    		1.8 to 2.2 V
    A11-22 (RH) - A11-24 (SSR+)
    		Ignition switch ON
    at 40°C (104°F)
    		1.2 to 1.6 V

HINT:
As the temperature increases, the voltage decreases.


Result:

Result
Proceed to
NG
A
OK (Checking from the PROBLEM SYMPTOMS TABLE)
B
OK (Checking from the DTC)
C



B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY
A


3.INSPECT A/C ROOM TEMPERATURE SENSOR


    E108929E09

  1. Remove the A/C room temperature sensor.

  1. Turn the ignition switch ON.



    E109268E01

  1. Measure the voltage according to the value(s) in the table below.

    Voltage:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    A33-3 (S5) - A33-4 (VO)
    		at 25°C (77°F)
    Humidity 10%
    		0.7 to 1.08 V
    A33-3 (S5) - A33-4 (VO)
    		at 25°C (77°F)
    Humidity 20%
    		0.72 to 1.57 V
    A33-3 (S5) - A33-4 (VO)
    		at 25°C (77°F)
    Humidity 30%
    		1.13 to 1.95 V
    A33-3 (S5) - A33-4 (VO)
    		at 25°C (77°F)
    Humidity 40%
    		1.61 to 2.24 V
    A33-3 (S5) - A33-4 (VO)
    		at 25°C (77°F)
    Humidity 50%
    		1.99 to 2.46 V
    A33-3 (S5) - A33-4 (VO)
    		at 25°C (77°F)
    Humidity 60%
    		2.26 to 2.66 V
    A33-3 (S5) - A33-4 (VO)
    		at 25°C (77°F)
    Humidity 70%
    		2.48 to 2.85 V
    A33-3 (S5) - A33-4 (VO)
    		at 25°C (77°F)
    Humidity 80%
    		2.68 to 3.04 V
    A33-3 (S5) - A33-4 (VO)
    		at 25°C (77°F)
    Humidity 90%
    		2.87 to 3.05 V

    NOTICE:
    1. Do not touch the A/C room humidity sensor because it may be affected by body temperature and may not work properly.
    2. Be sure to hold the connector of the sensor.
    3. The output voltage at the ambient temperature 25°C (77°F) is shown above.



NG
REPLACE A/C ROOM TEMPERATURE SENSOR
OK


4.CHECK HARNESS AND CONNECTOR (A/C ROOM TEMPERATURE SENSOR - A/C AMPLIFIER ASSEMBLY)


    E108939E06

  1. Disconnect the connector from the A/C amplifier assembly.

  1. Measure the resistance according to the value(s) in the table below.

    Resistance:
    Tester connection
    (Symbols)
    		Condition
    		Specified condition
    A11-24 (SSR+) - A33-3 (S5)
    		Always
    		Below 1 Ω
    A11-22 (RH) - A33-4 (VO)
    		Always
    		Below 1 Ω
    A11-3 (SSR+) - Body ground
    		Always
    		10 kΩ or higher
    A11-22 (RH) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY