PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:B2075

DESCRIPTION

This DTC is stored when there is a malfunction in the front seat inner belt buckle switch circuit for the passenger side.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK FOR DTC

   
   

   1. Clear the DTCs (Click here).

   2. Check for DTCs (Click here).

      OK
      DTC B2075 is not output.

   
   
   • OKClick here
   • NGClick here
2. Click here

   CHECK SEAT BELT CONTROL ECU

   
   
   1. 

      Reconnect the E41 seat belt control ECU connector.

   2. Disconnect the c30*1 or c24*2 front seat inner belt connector.

      Tip:
      

      • *1: for LHD

      • *2: for RHD

   3. Use an oscilloscope to check the waveform of the seat belt control ECU between the connector terminals.

      Table 1. Measurement Condition

      Tester Connection	E41-5 (PBK+) - E41-6 (PBK-)
      Tool Setting	5 V/DIV., 20 ms./DIV.
      Switch Condition	Ignition switch ON Front passenger side seat belt unfastened (Buckle switch off)
      	Ignition switch ON Front passenger side seat belt fastened (Buckle switch on)

      OK
      4.5 to 5.5 V

      Table 2. Result

      Result	Proceed to
      OK (for LHD)	A
      OK (for RHD)	B
      NG	C

   
   
   • AClick here
   • BClick here
   • CClick here
3. Click here

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

   
   
   1. 

      Disconnect the c30*1 or c24*2 front seat inner belt connector.

      Tip:
      

      • *1: for LHD

      • *2: for RHD

   2. Disconnect the E41 seat belt control ECU connector.

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

      Standard Resistance
      Table 3. for LHD Tester Connection Condition Specified Condition c30-2 (+) - E41-5 (PBK+) Always Below 1 Ω c30-1 (E) - E41-6 (PBK-) c30-2 (+) or E41-5 (PBK+) - Body ground 1 MΩ higher c30-1 (E) or E41-6 (PBK-) - Body ground
      Table 4. for RHD Tester Connection Condition Specified Condition c24-2 (+) - E41-5 (PBK+) Always Below 1 Ω c24-1 (E) - E41-6 (PBK-) c24-2 (+) or E41-5 (PBK+) - Body ground 1 MΩ higher c24-1 (E) or E41-6 (PBK-) - Body ground

      Table 5. Result

      Result	Proceed to
      OK (for LHD)	A
      OK (for RHD)	B
      NG	C

   
   
   • AClick here
   • BClick here
   • CClick here
4. Click here

   REPLACE SEAT BELT CONTROL ECUClick here

5. Click here

   REPAIR OR REPLACE HARNESS OR CONNECTOR

6. Click here

   REPLACE SEAT BELT CONTROL ECUClick here

7. Click here

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

8. Click here

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

9. Click here

   USE SIMULATION METHOD TO CHECKClick here