Occupant Classification System Malfunction - Airbag System

SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: 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 system.

If the center airbag sensor assembly receives signals from the occupant classification ECU, it determines whether the front passenger airbag, front passenger side knee airbag, front seat side airbag RH and front seat belt pretensioner RH 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 to ON.

(b) Using the Techstream, check for DTCs of the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.

NG -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Occupant Classification System
OK -- Continue to next step.

2. CHECK CONNECTORS

(a) Turn the ignition switch off.

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

(c) for Power seat:

Check that the connectors are properly connected to the center airbag sensor assembly and occupant classification ECU. Also check that the connectors that link the front seat wire RH, junction connector and No. 2 floor wire are properly connected.

(d) for Manual seat:

Check that the connectors are properly connected to the center airbag sensor assembly and occupant classification ECU.

OK:

The connectors are properly connected.

HINT
If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

(e) for Power seat:

Disconnect the connectors from the center airbag sensor assembly and occupant classification ECU. Also disconnect the connectors that link the front seat wire RH, junction connector and No. 2 floor wire.

(f) for Manual seat:

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

(g) Check that the connector terminals are not damaged.

OK:

The terminals are not deformed or damaged.

Result

Result:

C -- REPLACE NO. 2 FLOOR WIRE

B -- REPLACE WIRE HARNESS
A -- Continue to next step.

3. CHECK VEHICLE CONDITION

(a) Check the passenger seat type.

Result:

A
for Manual seat

B
for Power seat

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

4. CHECK NO. 2 FLOOR WIRE (OPEN)

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





NOTICE:
Do not forcibly insert SST into the terminals of the connector when connecting.

SST : 09843-18040

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

Standard Resistance:





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

5. CHECK NO. 2 FLOOR WIRE (SHORT)

(a) Disconnect SST from connector B.





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

Standard Resistance:





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

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

(a) Connect the cable to the negative (-) battery terminal.





(b) Turn the ignition switch to ON.

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

Standard Voltage:





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

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

(a) Turn the ignition switch off.





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

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

Standard Resistance:





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HINT
After replacing the center airbag sensor assembly, check for DTCs of the center airbag sensor assembly. If DTC B1650/32 is detected, replace the occupant classification ECU Smart Key System (for Start Function) and perform "zero point calibration" and "sensitivity check" of the occupant classification system Smart Key System (for Start Function).

NG -- REPLACE NO. 2 FLOOR WIRE

OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

8. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (OPEN)

(a) Connect the connectors that link the front seat wire RH, junction connector and No. 2 floor wire.





(b) Using SST, connect terminals 12 (FSP+) and 13 (FSP-) of connector B.

NOTICE:
Do not forcibly insert SST into the terminals of the connector when connecting.

SST : 09843-18040

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

Standard Resistance:





Text in Illustration

Text in Illustration:

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

9. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT)

(a) Disconnect SST from connector B.





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

Standard Resistance:





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

10. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (SHORT TO B+)

(a) Connect the cable to the negative (-) battery terminal.





(b) Turn the ignition switch to ON.

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

Standard Voltage:





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

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

(a) Turn the ignition switch off.





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

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

Standard Resistance:





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HINT
After replacing the center airbag sensor assembly, check for DTCs of the center airbag sensor assembly. If 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 NO. 2 FLOOR WIRE (SHORT TO GROUND)

OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

12. CHECK NO. 2 FLOOR WIRE (OPEN)

(a) Disconnect the junction connector from the No. 2 floor wire.





HINT
SST already been inserted into connector B.

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

Standard Resistance:





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

13. CHECK FRONT SEAT WIRE RH (OPEN)

(a) Disconnect the front seat wire RH connector from the junction connector.





(b) Using SST, connect terminals 8 (FSR+) and 4 (FSR-) of connector E.

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

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

Standard Resistance:





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NG -- REPLACE FRONT SEAT WIRE RH

OK -- REPLACE JUNCTION CONNECTOR

14. CHECK NO. 2 FLOOR WIRE (SHORT)

(a) Disconnect the junction connector from the No. 2 floor wire.





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

Standard Resistance:





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

15. CHECK FRONT SEAT WIRE RH (SHORT)

(a) Disconnect the front seat wire RH connector from the junction connector.





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

Standard Resistance:





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NG -- REPLACE FRONT SEAT WIRE RH

OK -- REPLACE JUNCTION CONNECTOR

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

(a) Turn the ignition switch off.





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

(c) Disconnect the junction connector from the No. 2 floor wire.

(d) Connect the cable to the negative (-) battery terminal.

(e) Turn the ignition switch to ON.

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

Standard Voltage:





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

17. CHECK FRONT SEAT WIRE RH (SHORT TO B+)

(a) Turn the ignition switch off.





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

(c) Disconnect the front seat wire RH connector from the junction connector.

(d) Connect the cable to the negative (-) battery terminal.

(e) Turn the ignition switch to ON.

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

Standard Voltage:





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NG -- REPLACE FRONT SEAT WIRE RH

OK -- REPLACE JUNCTION CONNECTOR

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

(a) Disconnect the junction connector from the No. 2 floor wire.





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

Standard Resistance:





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

19. CHECK FRONT SEAT WIRE RH (SHORT TO GROUND)

(a) Disconnect the front seat wire RH connector from the junction connector.





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

Standard Resistance:





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NG -- REPLACE FRONT SEAT WIRE RH

OK -- REPLACE JUNCTION CONNECTOR