AIR CONDITIONING SYSTEM, Diagnostic DTC:B1469/69

DTC Code DTC Name
B1469/69 Infrared Ray Sensor Circuit

DESCRIPTION

The infrared ray sensor, which is installed on the rear roof, detects human body temperature and controls the heater and air conditioner "AUTO" mode in 4 zones. Signals are transmitted to the air conditioning amplifier via the LIN communication line. This DTC is output when the temperature of the physical object is detected as -30°C (-22°F) or less, or 80°C (176°F) or more for 10 seconds or more.

DTC Code DTC Detection Condition Trouble Area
B1469/69 Open or short in infrared ray sensor circuit

  • Fuse

  • Infrared ray sensor

  • Harness or connector of infrared ray sensor

WIRING DIAGRAM

A01GZ68E18

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT FUSE (D-IG1-5)


    1. Remove the D-IG1-5 fuse from the main body ECU (driver side junction block).

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

      Standard resistance
      Tester Connection Condition Specified Condition
      D-IG1-5 fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  2. READ VALUE USING INTELLIGENT TESTER (IR SENSOR)


    1. Use the Data List to check if the infrared rays sensors are functioning properly.

      Air Conditioner
      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      Infrared Rays Sensor 1

      Infrared rays sensor 1

      Min.: 1°C (33.8°F)

      Max.: 50.5°C (122.9°F)

      		 Actual human body temperature is displayed

      Open in circuit: 1°C (33.8°F)

      Short in circuit: 50.5°C (122.9°F)
      Infrared Rays Sensor 2

      Infrared rays sensor 2

      Min.: 1°C (33.8°F)

      Max.: 50.5°C (122.9°F)
      Infrared Rays Sensor 3

      Infrared rays sensor 3

      Min.: 1°C (33.8°F)

      Max.: 50.5°C (122.9°F)
      Infrared Rays Sensor 4

      Infrared rays sensor 4

      Min.: 1°C (33.8°F)

      Max.: 50.5°C (122.9°F)
      Infrared Rays Sensor 5

      Infrared rays sensor 5

      Min.: 1°C (33.8°F)

      Max.: 50.5°C (122.9°F)
      Infrared Rays Sensor 6

      Infrared rays sensor 6

      Min.: 1°C (33.8°F)

      Max.: 50.5°C (122.9°F)
      Infrared Rays Sensor 7

      Infrared rays sensor 7

      Min.: 1°C (33.8°F)

      Max.: 50.5°C (122.9°F)
      Infrared Rays Sensor 8

      Infrared rays sensor 8

      Min.: 1°C (33.8°F)

      Max.: 50.5°C (122.9°F)
      OK
      The display is as specified in the normal condition.

    NG

    CHECK HARNESS AND CONNECTOR (INFRARED RAY SENSOR - BODY GROUND AND BATTERY) Click here

    OK

    REPLACE AIR CONDITIONING AMPLIFIER Click here

  3. CHECK HARNESS AND CONNECTOR (INFRARED RAY SENSOR - BODY GROUND AND BATTERY)

    A01H0E3E01

    1. Disconnect the X13 infrared ray sensor connector.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      X13-1 (E) - Body ground Always 10 kΩ or higher

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      X13-5 (IG) - Body ground Power switch ON (IG) 11 to 14 V
      Power switch OFF Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE INFRARED RAY SENSOR Click here