Dtc B1400 Rain Sensor Malfunction

Vehicle Exterior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Wiper Washer. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER

INSPECT MAP LIGHT ASSEMBLY

CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - BATTERY AND BODY GROUND)

CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - RAIN SENSOR)

DTC B1400 Rain Sensor Malfunction


DESCRIPTION

When the windshield wiper switch assembly position is set to AUTO, the rain sensor detects the amount of raindrops. According to the amount of raindrops, the rain sensor sends wiper drive request signals to the windshield wiper ECU at the optimal timings via LIN communication. Also, the vehicle speed-sensitive intermittent operation is still performed even when there is a rain sensor malfunction.

DTC Code
DTC Detection Condition
Trouble Area
B1400
  1. The rain sensor output signal is not detected.
  1. Rain sensor
  2. Map light assembly
  3. Harness or connector

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Wiper Washer.Wiper And Washer System (W/ Rain Sensor). Dtc B1400 Rain Sensor Malfunction


INSPECTION PROCEDURE

NOTICE:
  1. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  2. Since the wiper and washer system has functions that use LIN communication and CAN communication, first confirm that there is no malfunction in the communication system by inspecting the LIN communication functions and CAN communication in accordance with the "How to Proceed with Troubleshooting" procedures. Then, conduct the following inspection procedure.
1.READ VALUE USING INTELLIGENT TESTER

  1. Check the Data List for proper functioning of the rain sensor.

    Rain Sensor
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    Sensor Low Temp Info
    		Rain sensor low temp / NG or OK
    		NG: Rain sensor is low temp
    OK: Rain sensor is normal
    		-
    Sensor High Temp Info
    		Rain sensor high temp / NG or OK
    		NG: Rain sensor is high temp
    OK: Rain sensor is normal
    		-
    OK:
    The display is as specified in the normal condition.


NG
REPLACE RAIN SENSOR (Click here)
OK


2.INSPECT MAP LIGHT ASSEMBLY

  1. Remove the map light.

    1. w/ Sliding Roof : (Click here).
    2. w/o Sliding Roof : (Click here).


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Wiper Washer.Wiper And Washer System (W/ Rain Sensor). Dtc B1400 Rain Sensor Malfunction

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 (GND5) - 4 (GND2)
    		Always
    		Below 1 Ω
    14 (IG) - 29 (IG2)
    		Always
    		Below 1 Ω
    Result
    Result
    		Proceed to
    OK
    		A
    NG (w/ Sliding Roof)
    		B
    NG (w/o Sliding Roof)
    		C


B
REPLACE MAP LIGHT ASSEMBLY (Click here)

C
REPLACE MAP LIGHT ASSEMBLY (Click here)
A


3.CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - BATTERY AND BODY GROUND)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Wiper Washer.Wiper And Washer System (W/ Rain Sensor). Dtc B1400 Rain Sensor Malfunction

  1. Disconnect the R7 map light connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    R7-3 (GND5) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    R7-14 (IG) - Body ground
    		Engine switch on (IG)
    		11 to 14 V
    R7-14 (IG) - Body ground
    		Engine switch off
    		Below 1 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (MAP LIGHT ASSEMBLY - RAIN SENSOR)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Wiper Washer.Wiper And Washer System (W/ Rain Sensor). Dtc B1400 Rain Sensor Malfunction

  1. Disconnect the R7 map light connector.

  1. Disconnect the R11 rain sensor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    R7-4 (GND2) - R11-1 (ES)
    		Always
    		Below 1 Ω
    R7-29 (IG2) - R11-4 (SIG)
    R7-4 (GND2) - Body ground
    		Always
    		10 kΩ or higher
    R7-29 (IG2) - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE RAIN SENSOR (Click here)