B2063

PRE-COLLISION SYSTEM: B2063: Buckle Switch Malfunction

DTC B2063 - Buckle Switch Malfunction

DESCRIPTION

- This circuit consists of the front seat inner belt assembly RH, front seat inner belt assembly LH, center airbag sensor assembly, occupant classification ECU*2 and seat belt control ECU.
- When the driver side seat belt is fastened to the front seat inner belt assembly LH, the center airbag sensor assembly detects malfunctions in the circuit.
- When the passenger side seat belt is fastened to the front seat inner belt assembly RH, the seat belt control ECU detects malfunctions in the circuit.*1
- When the passenger side seat belt is fastened to the front seat inner belt assembly RH, the occupant classification ECU detects malfunctions in the circuit.*2
- The center airbag sensor assembly sends information about the seat belt fastened/unfastened condition and circuit malfunctions through CAN communication to the seat belt control ECU.
- The seat belt control ECU uses information from the center airbag sensor assembly to control the pre-collision system.

HINT:
- *1: w/o Occupant classification system
- *2: w/ Occupant classification system





WIRING DIAGRAM





INSPECTION PROCEDURE
NOTE: When the seat belt control ECU is replaced with a new one, INITIALIZATION must be performed. Pre-Collision System

PROCEDURE

1. CHECK DTC OUTPUT
(a) Delete the DTC Pre-Collision System.
(b) Check the DTC output.






HINT: *: w/ Occupant classification system

D -- GO TO OCCUPANT CLASSIFICATION SYSTEM (B1771)
C -- GO TO SUPPLEMENTAL RESTRAINT SYSTEM (B1650, B1655)
B -- GO TO CAN COMMUNICATION SYSTEM
A -- Continue to next step.
2. CHECK DTC OUTPUT (B2063)

HINT: Before deleting DTC B2063, first delete the DTCs of the occupant detection ECU, then delete the DTCs of the center airbag sensor assembly.
(a) Delete the DTC Pre-Collision System.
(b) Check the DTC output.






HINT:
- *1: w/o Occupant classification system
- *2: w/ Occupant classification system

C -- USE SIMULATION METHOD TO CHECK
B -- REPLACE SEAT BELT CONTROL ECU
A -- Continue to next step.
3. READ VALUE USING TECHSTREAM (BUCKLE SWITCH STATUS)
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Pre-Collision / Data List.
(e) Check the Data List for proper functioning of the passenger side seat belt.
Pre-Collision:






OK:
SET (Fasten passenger side seat belt) appears on the Techstream.
OK -- REPLACE SEAT BELT CONTROL ECU
NG -- Continue to next step.
4. CHECK HARNESS AND CONNECTOR (SEAT BELT CONTROL ECU - FRONT SEAT BELT ASSEMBLY RH)





(a) Disconnect the negative (-) battery terminal and wait at least 90 seconds.

HINT: Make sure that the engine switch is off before disconnecting the cable.
(b) Disconnect the P4 belt and Q38 ECU connectors.
(c) Using a service wire, connect terminals PBK+ and PBK- of connector P4.
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (SEAT BELT CONTROL ECU - FRONT SEAT INNER BELT ASSEMBLY RH)





(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (SEAT BELT CONTROL ECU - FRONT SEAT BELT ASSEMBLY RH)





(a) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (SEAT BELT CONTROL ECU - FRONT SEAT BELT ASSEMBLY RH)
(a) Connect the negative (-) battery terminal, and turn the engine switch on (IG).





(b) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
8. CHECK DTC OUTPUT (B2063)
(a) Disconnect the negative (-) battery terminal and wait at least 90 seconds.
(b) Connect the connectors from the center airbag sensor assembly and front seat inner belt assembly RH.
(c) Connect the cable to the negative (-) battery terminal and turn the engine switch on (IG). Then wait 60 seconds.
(d) Delete the DTC Pre-Collision System.
(e) Recheck for DTC.






B -- USE SIMULATION METHOD TO CHECK
A -- Continue to next step.
9. CHECK FRONT SEAT INNER BELT ASSEMBLY RH
(a) Disconnect the negative (-) battery terminal and wait at least 90 seconds.
(b) Replace the front seat inner belt assembly RH Components.
NEXT -- Continue to next step.
10. CHECK DTC OUTPUT (B2063)
(a) Connect the negative (-) battery terminal and turn the engine switch on (IG). Then wait 60 seconds.
(b) Delete the DTC Pre-Collision System.
(c) Recheck for DTC.






B -- REPLACE SEAT BELT CONTROL ECU
A -- END