Airbag System

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1150/23: Occupant Classification System Malfunction

DTC B1150/23 - Occupant Classification System Malfunction

DESCRIPTION

The occupant classification system circuit consists of the center airbag sensor assembly and the occupant classification ECU.
If the center airbag sensor assembly receives signals from the occupant classification ECU, it determines whether or not the front passenger airbag assembly and the front seat airbag assembly RH should be operated.
DTC B1150/23 is recorded when a malfunction is detected in the occupant classification system circuit.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC (OCCUPANT CLASSIFICATION ECU)
(a) Turn the ignition switch to the ON position, and wait for at least 10 seconds.
(b) Using the Techstream, check the DTCs of the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC is not output.
NG -- GO TO OCCUPANT CLASSIFICATION SYSTEM
OK -- Continue to next step.
2. CHECK DTC (CENTER AIRBAG SENSOR ASSEMBLY)





(a) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(b) Clear the DTCs stored in memory DTC Check / Clear.
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(e) Check the DTCs DTC Check / Clear.
OK:
DTC B1150/23 is not output.
HINT: Codes other than code B1150/23 may be output at this time, but they are not related to this check.

NG -- CHECK CONNECTION OF CONNECTORS
OK -- USE SIMULATION METHOD TO CHECK
3. CHECK CONNECTION OF CONNECTORS
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Check that the connectors are properly connected to the center airbag sensor assembly and the occupant classification ECU.
OK:
The connectors are connected.
NG -- CONNECT CONNECTORS, THEN GO TO STEP 1
OK -- Continue to next step.
4. CHECK OCCUPANT CLASSIFICATION ECU CIRCUIT (SHORT TO GROUND)





(a) Disconnect the connectors from the center airbag sensor assembly and the occupant classification ECU.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- CHECK FLOOR WIRE (SHORT TO GROUND)
OK -- Continue to next step.
5. CHECK OCCUPANT CLASSIFICATION ECU CIRCUIT (SHORT TO B+)





(a) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- CHECK FLOOR WIRE (SHORT TO B+)
OK -- Continue to next step.
6. CHECK OCCUPANT CLASSIFICATION ECU CIRCUIT (SHORT)





(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- CHECK FLOOR WIRE (SHORT)
OK -- Continue to next step.
7. CHECK OCCUPANT CLASSIFICATION ECU CIRCUIT (OPEN)





(a) Using a service wire, connect A29-1 (FSR+) and A29-2 (FSR-) of connector "B".
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- CHECK FLOOR WIRE (OPEN)
OK -- Continue to next step.
8. CHECK FLOOR WIRE (SHORT TO GROUND)





(a) Disconnect the floor wire connector from the seat wire No. 1.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- REPAIR OR REPLACE SEAT WIRE NO. 1
9. CHECK FLOOR WIRE (SHORT TO B+)





(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect the floor wire connector from the seat wire No. 1.
(d) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(e) Turn the ignition switch to the ON position.
(f) Measure the voltage according to the value(s) in the table below.
Standard voltage:






NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- REPAIR OR REPLACE SEAT WIRE NO. 1
10. CHECK FLOOR WIRE (SHORT)





(a) Disconnect the floor wire connector from the seat wire No. 1.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- REPAIR OR REPLACE SEAT WIRE NO. 1
11. CHECK FLOOR WIRE (OPEN)





(a) Disconnect the floor wire connector from the seat wire No. 1.
HINT: The service wire has already been inserted into connector "B".
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE FLOOR WIRE
OK -- REPAIR OR REPLACE SEAT WIRE NO. 1