B1650
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 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, front seat side 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
NOTE: 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.
1. Turn the ignition switch to the lock position.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect the connector from the center airbag sensor assembly.
4. Disconnect the connectors from the steering pad.
5. Disconnect the connectors from the front passenger airbag assembly.
6. Disconnect the connector from the front seat outer belt assembly LH.
7. Disconnect the connector from the front seat outer belt assembly RH.
8. Disconnect the connector from the front seat side airbag assembly LH.
9. Disconnect the connector from the front seat side airbag assembly RH.
10. Disconnect the connector from the curtain shield airbag assembly LH.
11. Disconnect the connector from the curtain shield airbag assembly RH.
PROCEDURE
1. CHECK DTC (OCCUPANT CLASSIFICATION ECU)
(a) Turn the ignition switch to ON, and wait for at least 10 seconds.
(b) Using the Techstream, check for DTCs of the occupant classification ECU Reading and Clearing Diagnostic Trouble Codes.
OK:
DTC is not output.
NG -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS
OK -- Continue to next step.
2. CHECK DTC (CENTER AIRBAG SENSOR ASSEMBLY)
(a) Turn the ignition switch to ON, and wait for at least 60 seconds.
(b) Clear the DTCs stored in the memory DTC Check / Clear.
(c) Turn the ignition switch off.
(d) Turn the ignition switch to ON, 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.
NG -- CHECK CONNECTION OF CONNECTORS (CENTER AIRBAG SENSOR AND OCCUPANT CLASSIFICATION ECU)
OK -- USE SIMULATION METHOD TO CHECK
3. CHECK CONNECTION OF CONNECTORS (CENTER AIRBAG SENSOR AND OCCUPANT CLASSIFICATION ECU)
(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
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 ECU CIRCUIT
(a) Check for short to B+ in the circuit.
(1) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
(2) Turn the ignition switch to ON.
(3) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
(4) Turn the ignition switch off.
(5) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(b) Check for open in the circuit.
(1) Disconnect the connectors from the center airbag sensor assembly and the occupant classification ECU.
(2) Using a service wire, connect Q4-8 (FSR+) and Q4-4 (FSR-) of connector E.
NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) Check for short in the circuit.
(1) Disconnect the service wire from connector E.
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(d) Check for short to ground in the circuit.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- CHECK FLOOR WIRE
OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
6. CHECK FLOOR WIRE
(a) Check for short to B+ in the circuit.
(1) Connect the negative (-) terminal cable to the battery.
(2) Turn the ignition switch to ON.
(3) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
(4) Turn the ignition switch off.
(5) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
(b) Check for open in the circuit.
(1) Disconnect the connectors from the floor wire and the No. 1 seat wire.
(2) Using a service wire, connect K1-16 (FSP+) and K1-24 (FSP-) of connector B.
NOTE: Do not forcibly insert a service wire into the terminals of the connector when connecting.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(c) Check for short in the circuit.
(1) Disconnect the service wire from connector B.
(2) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
(d) Check for short to ground in the circuit.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE FLOOR WIRE
OK -- REPLACE NO. 1 SEAT WIRE