DTC    B2075    Passenger Side Seat Belt Buckle Switch Circuit Malfunction

for Preparation Click here


DESCRIPTION

This DTC is stored when there is a short or open in the front seat inner belt buckle switch circuit (for passenger side).

DTC No.
DTC Detection Condition
Trouble Area
B2075
Open or short in front seat inner belt (buckle switch) circuit
  1. CAN communication system
  2. Front seat inner belt (for passenger side)
  3. Seat belt control ECU
  4. Wire harness or connector

WIRING DIAGRAM


E184675E05


INSPECTION PROCEDURE

HINT:
This circuit uses CAN communication. Therefore, be sure to check that the CAN communication system is normal before performing inspection (Click here).

1.CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT - SEAT BELT CONTROL ECU)

  1. Disconnect the front seat inner belt connector.

  1. Disconnect the seat belt control ECU connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard Resistance:
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    H7-5 (PBK+) - P25-5 (LBE+)
    		Always
    		Below 1 Ω
    H7-6 (PBK-) - P25-4 (LBE-)
    		Always
    		Below 1 Ω
    H7-5 (PBK+) or P25-5 (LBE+) - Body ground
    		Always
    		10 kΩ or higher
    H7-6 (PBK-) or P25-4 (LBE-) - Body ground
    		Always
    		10 kΩ or higher
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    H7-5 (PBK+) - Q20-5 (RBE+)
    		Always
    		Below 1 Ω
    H7-6 (PBK-) - Q20-4 (RBE-)
    		Always
    		Below 1 Ω
    H7-5 (PBK+) or Q20-5 (RBE+) - Body ground
    		Always
    		10 kΩ or higher
    H7-6 (PBK-) or Q20-4 (RBE-) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the seat belt control ECU connector.

  1. Reconnect the front seat inner belt connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (FRONT SEAT INNER BELT - SEAT BELT CONTROL ECU)
OK


2.CHECK SEAT BELT CONTROL ECU


    E185685E04

  1. Fasten the passenger side seat belt.

  1. Turn the power switch on (IG).

  1. Using an oscilloscope, check the waveform of the seat belt control ECU between the connector terminals.

    HINT:
    Voltage is only output for 10 ms of a 100 ms cycle.

    Item
    		Contents
    Terminal
    		H7-5 (PBK+)
    H7-6 (PBK-)
    Tool setting
    		2V/DIV, 20ms/DIV
    Vehicle Condition
    		Power switch on (IG)
    Text in Illustration 
    *1
    		Seat Belt Control ECU

    OK:
    Approximately 5 V



NG
REPLACE FRONT SEAT INNER BELT (for Passenger Side) (Click here)
OK

REPLACE SEAT BELT CONTROL ECU (Click here)