Airbag System (For TMC Made)

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM (for TMC Made): B1650/32: Occupant Classification System Malfunction
B1650/32 - 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 the front passenger airbag assembly, the front seat side airbag assembly RH and front seat outer belt assembly should be operated.

DTC B1650/32 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 on (IG), and wait for at least 10 seconds.

(b) Using 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 Occupant Classification System
OK -- Continue to next step.

2. CHECK DTC (CENTER AIRBAG SENSOR ASSEMBLY)

(a) Turn the ignition switch on (IG), and wait for at least 60 seconds.





(b) Clear the DTCs stored in the memory Airbag System (for TMC Made).

(c) Turn the ignition switch off.

(d) Turn the ignition switch on (IG), and wait for at least 60 seconds.

(e) Check the DTCs Airbag System (for TMC Made).

OK:

DTC B1650/32 is not output.

HINT
Codes other than DTC B1650/32 may be output at this time, but they are not related to this check.

OK -- USE SIMULATION METHOD TO CHECK Diagnosis System
NG -- Continue to next step.

3. CHECK CONNECTION OF CONNECTORS

(a) Turn the ignition switch off.

(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 properly connected.

NG -- CONNECT CONNECTORS PROPERLY
OK -- Continue to next step.

4. CHECK CONNECTORS

(a) Disconnect the connectors from the center airbag sensor assembly and the occupant classification ECU.

(b) Check that the connectors (on the center airbag sensor assembly side and occupant classification ECU side) are not damaged.

OK:

The connectors are not deformed or damaged.

NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.

5. CHECK VEHICLE TYPE

(a) Check the front passenger side seat type.

Result:





B -- CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (OPEN)
A -- Continue to next step.

6. CHECK FLOOR WIRE NO. 2 (OPEN)

(a) Using a service wire, connect terminals 12 (FSP+) and 13 (FSP-) of connector B.





NOTICE:
Do not forcibly insert a service wire into the terminals of the connector when connecting.

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

Standard resistance:





NG -- REPAIR OR REPLACE FLOOR WIRE NO. 2
OK -- Continue to next step.

7. CHECK FLOOR WIRE NO. 2 (SHORT)

(a) Disconnect the service wire from connector B.





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

Standard resistance:





NG -- REPAIR OR REPLACE FLOOR WIRE NO. 2
OK -- Continue to next step.

8. CHECK FLOOR WIRE NO. 2 (SHORT TO B+)

(a) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.





(b) Turn the ignition switch on (IG).

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

Standard voltage:





NG -- REPAIR OR REPLACE FLOOR WIRE NO. 2
OK -- Continue to next step.

9. CHECK FLOOR WIRE NO. 2 (SHORT TO GROUND)

(a) Turn the ignition switch off.





(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:





HINT
After replacing the center airbag sensor assembly, check for DTCs of the center airbag sensor assembly. If the DTC B1650/32 is detected, replace the occupant classification ECU Removal and perform "zero point calibration" and "sensitivity check" of the occupant classification system Programming and Relearning.

NG -- REPAIR OR REPLACE FLOOR WIRE NO. 2

OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

10. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (OPEN)

(a) Using a service wire, connect terminals 12 (FSP+) and 13 (FSP-) of connector B.





NOTICE:
Do not forcibly insert a service wire into the terminal of the connector when connecting.

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

Standard resistance:





NG -- CHECK FLOOR WIRE NO. 2 (OPEN)
OK -- Continue to next step.

11. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT)

(a) Disconnect the service wire from connector B.





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

Standard resistance:





NG -- CHECK FLOOR WIRE NO. 2 (SHORT)
OK -- Continue to next step.

12. CHECK OCCUPANT CLASSIFICATION SYSTEM 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 on (IG).

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

Standard voltage:





NG -- CHECK FLOOR WIRE NO. 2 (SHORT TO B+)
OK -- Continue to next step.

13. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO GROUND)

(a) Turn the ignition switch off.





(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:





HINT
After replacing the center airbag sensor assembly, check for DTCs of the center airbag sensor assembly. If the DTC B1650/32 is detected, replace the occupant classification ECU Removal and perform "zero point calibration" and "sensitivity check" of the occupant classification system Programming and Relearning.

NG -- CHECK FLOOR WIRE NO. 2 (SHORT TO GROUND)

OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

14. CHECK FLOOR WIRE NO. 2 (OPEN)

(a) Disconnect the front seat wire RH connector from the floor wire No. 2.





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 NO. 2

OK -- REPAIR OR REPLACE FRONT SEAT WIRE RH

15. CHECK FLOOR WIRE NO. 2 (SHORT)

(a) Disconnect the front seat wire RH connector from the floor wire No. 2.





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

Standard resistance:





NG -- REPAIR OR REPLACE FLOOR WIRE NO. 2

OK -- REPAIR OR REPLACE FRONT SEAT WIRE RH

16. CHECK FLOOR WIRE NO. 2 (SHORT TO B+)

(a) Turn the ignition switch off.





(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(c) Disconnect the front seat wire RH connector from the floor wire No. 2.

(d) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(e) Turn the ignition switch on (IG).

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

Standard voltage:





NG -- REPAIR OR REPLACE FLOOR WIRE NO. 2

OK -- REPAIR OR REPLACE FRONT SEAT WIRE RH

17. CHECK FLOOR WIRE NO. 2 (SHORT TO GROUND)

(a) Disconnect the front seat wire RH connector from the floor wire No. 2.





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

Standard resistance:





NG -- REPAIR OR REPLACE FLOOR WIRE NO. 2

OK -- REPAIR OR REPLACE FRONT SEAT WIRE RH