B1650

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 and the occupant classification system.

If the center airbag sensor receives signals from the occupant classification ECU, it determines whether the front passenger airbag, the front seat side airbag RH and front seat outer belt should be operated.

DTC B1650/32 is recorded when a malfunction is detected in the occupant classification system circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* w/ Navigation System (for HDD):
After the power switch is turned OFF, the display and navigation module display (HDD navigation system) records various types of memory and settings. As a result, after turning the power switch OFF, be sure to wait for the time specified in the following table before disconnecting the cable from the negative (-) battery terminal.

Waiting Time before Disconnecting Cable from Negative (-) Battery Terminal:





* When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

PROCEDURE

1. CHECK FOR DTC (OCCUPANT CLASSIFICATION ECU)

(a) Turn the power switch ON (IG), and wait for at least 10 seconds.

(b) Check for the DTCs of the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.

OK:

DTC is not output.

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

2. CHECK FOR DTC (CENTER AIRBAG SENSOR)





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

(b) Clear the DTCs DTC Check / Clear.

(c) Turn the power switch OFF.

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

(e) Check for DTCs DTC Check / Clear.

OK:

DTC B1650 is not output.

HINT
Codes other than DTC B1650 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 Diagnosis System

3. CHECK CONNECTION OF CONNECTORS

(a) Turn the power 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 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 and the occupant classification ECU.

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

OK:

The connectors are not deformed or damaged.

NG -- REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

5. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT





(a) Using a service wire, connect terminals 16 (FSR+) and 22 (FSR-) of connector B.

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

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

Standard resistance:





(c) Disconnect the service wire from connector B.

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

Standard resistance:





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

(f) Turn the power switch ON (IG).

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

Standard voltage:





NG -- CHECK FLOOR WIRE

OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

6. CHECK FLOOR WIRE





(a) Turn the power 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.

(d) Using a service wire, connect terminals 16 (FSR+) and 22 (FSR-) of connector B.

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

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

Standard resistance:





(f) Disconnect the service wire from connector B.

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

Standard resistance:





(h) Turn the power switch OFF.

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

(j) Disconnect the front seat wire RH connector from the floor wire.

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

(l) Turn the power switch ON (IG).

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

Standard voltage:





NG -- REPLACE FLOOR WIRE

OK -- REPLACE FRONT SEAT WIRE RH