Occupant Classification System Malfunction - Airbag System

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B1650/32: Occupant Classification System Malfunction

DTC 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:
- When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.
- After the ignition switch is turned OFF, the navigation system requires approximately 90 seconds to record various types of memory and settings. As a result, after turning the ignition switch OFF, wait 90 seconds or more before disconnecting the cable from the negative (-) battery terminal.

PROCEDURE

1. CHECK FOR DTC (OCCUPANT CLASSIFICATION ECU)
(a) Turn the ignition switch ON, and wait for at least 10 seconds.
(b) Check for the DTCs of the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.
NG -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
OK -- Continue to next step.
2. CHECK VEHICLE SYSTEM
(a) Check vehicle system.

Result

A -- CHECK FOR DTC (CENTER AIRBAG SENSOR)
B -- Continue to next step.
3. CHECK FOR DTC (CENTER AIRBAG SENSOR)

(a) Turn the ignition switch ON, and wait for at least 60 seconds.
(b) Clear the DTCs DTC Check / Clear.
(c) Turn the ignition switch OFF.
(d) Turn the ignition switch ON, and wait for at least 60 seconds.
(e) Check for DTCs DTC Check / Clear.
OK:
DTC B1650/32 is not output.
HINT: Codes other than DTC B1650/32 maybe output at this time, but they are not related to this check.

NG -- CHECK CONNECTION OF CONNECTORS
OK -- USE SIMULATION METHOD TO CHECK
4. 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 and the occupant classification ECU.
OK:
The connectors are properly connected.
NG -- CONNECT CONNECTORS PROPERLY
OK -- Continue to next step.
5. 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 damaged or damaged.
NG -- REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
6. CHECK OCCUPANT CLASSIFICATION SYSTEM CIRCUIT

(a) Using a service wire, connect terminal 12 (FSP+) and 13 (FSP-) of connector B.
NOTE: Do not forcibly insert a service wire into the terminals of the connector when connecting the 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 ignition switch ON.
(g) Measure the voltage according to the value(s) in the table below.
Standard voltage:

Result

B -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
A -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
C -- Continue to next step.
7. CHECK NO. 2 FLOOR WIRE

(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 No. 2 floor wire.
(d) Using a service wire, connect terminal 12 (FSP+) and 13 (FSP-) of connector B.
(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) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(i) Turn the ignition switch ON.
(j) Measure the voltage according to the value(s) in the table below.
Standard voltage:

NG -- REPLACE NO. 2 FLOOR WIRE
OK -- REPLACE FRONT SEAT WIRE RH
8. CHECK FOR DTC (CENTER AIRBAG SENSOR)

(a) Turn the ignition switch ON, and wait for at least 60 seconds.
(b) Clear the DTCs DTC Check / Clear.
(c) Turn the ignition switch OFF.
(d) Turn the ignition switch ON, 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 maybe output at this time, but they are not related to this check.

NG -- CHECK CONNECTION OF CONNECTORS
OK -- USE SIMULATION METHOD TO CHECK
9. 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 and the occupant classification ECU.
OK:
The connectors are properly connected.
NG -- CONNECT CONNECTORS PROPERLY
OK -- Continue to next step.
10. 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 damaged or damaged.
NG -- REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
11. CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR - OCCUPANT CLASSIFICATION ECU)

(c) Disconnect the service wire from connector B.
(d) Measure the resistance according to the value(s) in the table below.
Standard resistance:

Result

B -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
A -- REPLACE NO. 2 FLOOR WIRE
C -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY