Occupant Classification System Malfunction - Airbag System
SUPPLEMENTAL RESTRAINT SYSTEM: 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.
When the center airbag sensor assembly receives signals from the occupant classification ECU, it determines whether or not the front passenger airbag assembly, front seat airbag assembly RH and seat belt pretensioner RH should be operated.
DTC B1650/32 is set when a malfunction is detected in the occupant classification system circuit.
WIRING DIAGRAM
INSPECTION PROCEDURE
CAUTION:
In order to prevent unexpected airbag deployment, disconnect the following connectors before inspecting parts such as wire harnesses, if the application of tester probes to the center airbag sensor assembly connector is necessary.
* (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 connectors from the center airbag sensor assembly.
* (d) Disconnect the connectors from the steering pad.
* (e) Disconnect the connector from the front passenger airbag assembly.
* (f) Disconnect the connector from the front seat airbag assembly LH.
* (g) Disconnect the connector from the front seat airbag assembly RH.
HINT
Skip the following steps if side and curtain shield airbags are not fitted.
* (h) Disconnect the connector from the curtain shield airbag assembly LH.
* (i) Disconnect the connector from the curtain shield airbag assembly RH.
* (j) Disconnect the connector from the front seat outer belt assembly LH.
* (k) Disconnect the connector from the front seat outer belt assembly RH.
PROCEDURE
1. CHECK DTC (CENTER AIRBAG SENSOR ASSEMBLY)
(a) Turn the ignition switch to the ON position.
(b) Clear any DTCs stored in the 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 for DTCs DTC Check / Clear.
OK:
DTC B1650/32 is not output.
HINT
DTCs other than B1650/32 may be output at this time, but they are not related to this check.
OK -- USE SIMULATION METHOD TO CHECK
NG -- Continue to next step.
2. 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 for DTCs of the occupant classification ECU Diagnosis System.
OK:
DTC is not output.
NG -- GO TO DTC CHART
OK -- Continue to next step.
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 properly connected.
NG -- CONNECT CONNECTORS
OK -- Continue to next step.
4. CHECK CONNECTORS
(a) Check that the connectors (on the center airbag sensor assembly side and occupant classification ECU side) are not damaged Electronic Circuit Inspection Procedure.
OK:
The connectors are not deformed or damaged.
NG -- REPAIR OR REPLACE WIRE HARNESS
OK -- Continue to next step.
5. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (FOR OPEN)
(a) Disconnect the connectors from the center airbag sensor assembly and the occupant classification ECU.
(b) Separate Seat :
Using a service wire, connect O5-8 (FSR+) and O5-4 (FSR-) of connector E.
NOTICE:
Do not forcibly insert a service wire into the terminals of the connector when connecting.
(c) Bench Seat :
Using a service wire, connect O10-11 (FSR+) and O10-12 (FSR-) of connector E.
NOTICE:
Do not forcibly insert a service wire into the terminals of the connector when connecting.
(d) Measure the resistance.
Standard resistance:
NG -- CHECK NO. 1 SEAT WIRE (FOR OPEN)
OK -- Continue to next step.
6. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (FOR SHORT)
(a) Disconnect the service wire from connector E.
(b) Measure the resistance.
Standard resistance:
NG -- CHECK NO. 1 SEAT WIRE (FOR SHORT)
OK -- Continue to next step.
7. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (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.
Standard voltage:
NG -- CHECK NO. 1 SEAT WIRE (TO B+)
OK -- Continue to next step.
8. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT (TO GROUND)
(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.
Standard resistance:
NG -- CHECK NO. 1 SEAT WIRE (TO GROUND)
OK -- Continue to next step.
9. CHECK CENTER AIRBAG SENSOR ASSEMBLY
(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) Replace the center airbag sensor assembly Removal.
HINT
Perform the inspection using parts from a normal vehicle when possible.
(d) Connect the connectors to the center airbag sensor assembly.
(e) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(f) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(g) Clear any DTCs stored in the memory DTC Check / Clear.
(h) Turn the ignition switch to the LOCK position.
(i) Turn the ignition switch to the ON position, and wait for at least 60 seconds.
(j) Check for DTCs DTC Check / Clear.
Result:
HINT
DTCs other than B1650/32 may be output at this time, but they are not related to this check.
C -- END
B -- REPLACE OCCUPANT CLASSIFICATION ECU
A -- Continue to next step.
10. REPLACE OCCUPANT CLASSIFICATION ECU
(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) Replace the occupant classification ECU Removal.
NEXT -- Continue to next step.
11. PERFORM ZERO POINT CALIBRATION
(a) Connect the negative (-) terminal cable to the battery.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Using the Techstream, perform the zero point calibration Occupant Classification System (for Separate Seat Type).
OK:
COMPLETED is displayed on the tester.
NEXT -- Continue to next step.
12. PERFORM SENSITIVITY CHECK
(a) Using the Techstream, perform the sensitivity check Occupant Classification System (for Separate Seat Type).
Standard Value:
27 to 33 kg (59.52 to 72.75 lb)
NEXT -- END
13. CHECK NO. 1 SEAT WIRE (FOR OPEN)
(a) Disconnect the No. 1 seat wire connector from the instrument panel wire.
HINT
The service wire has already been inserted into connector E.
(b) Measure the resistance.
Standard resistance:
*1 : Separate Seat
*2 : Bench Seat
NG -- REPAIR OR REPLACE NO. 1 SEAT WIRE
OK -- REPAIR OR REPLACE FLOOR WIRE
14. CHECK NO. 1 SEAT WIRE (FOR SHORT)
(a) Disconnect the No. 1 seat wire connector from the instrument panel wire.
(b) Measure the resistance.
Standard resistance:
*1 : Separate Seat
*2 : Bench Seat
NG -- REPAIR OR REPLACE NO. 1 SEAT WIRE
OK -- REPAIR OR REPLACE FLOOR WIRE
15. CHECK NO. 1 SEAT WIRE (TO B+)
(a) Disconnect the No. 1 seat wire connector from the instrument panel wire.
(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(c) Turn the ignition switch to the ON position.
(d) Measure the voltage.
Standard voltage:
*1 : Separate Seat
*2 : Bench Seat
NG -- REPAIR OR REPLACE NO. 1 SEAT WIRE
OK -- REPAIR OR REPLACE FLOOR WIRE
16. CHECK NO. 1 SEAT WIRE (TO GROUND)
(a) Disconnect the No. 1 seat wire connector from the instrument panel wire.
(b) Measure the resistance.
Standard resistance:
*1 : Separate Seat
*2 : Bench Seat
NG -- REPAIR OR REPLACE NO. 1 SEAT WIRE
OK -- REPAIR OR REPLACE FLOOR WIRE
17. REPLACE OCCUPANT CLASSIFICATION ECU
(a) Turn the ignition switch to the ON position.
(b) Using the Techstream, read the current setting data stored in the occupant classification ECU Registration.
HINT
If the previous ECU data cannot be stored in the Techstream, replace the front seat cushion assembly (with occupant classification ECU, occupant classification sensor).
(c) Turn the ignition switch to the LOCK position.
(d) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(e) Replace the occupant classification ECU Removal.
(f) Connect the negative (-) terminal cable to the battery.
(g) Turn the ignition switch to the ON position.
(h) Using the Techstream, write the setting data read from the previously installed occupant classification ECU into the newly installed occupant classification ECU Registration.
NEXT -- Continue to next step.
18. PERFORM SENSITIVITY CHECK
(a) Perform the sensitivity check Initialization.
NEXT -- END