B1448
DTC B1448The passenger occupant classification (OC) system consists of the SRSCM and the OC module. The above DTC is recorded when a defect or communication error of the OC module is detected in the OC module circuit.
DTC Detecting Condition:
Schematic Diagram:
TERMINAL & CONNECTOR INSPECTION
1. Visually inspect all connectors related to the affected circuit for damage and secure connection.
2. Inspect terminals for damage and corrosion.
CAUTION: Avoid damaging connectors during the inspection process.
3. Are any problems found?
NO - Go to next step (INSPECTION PROCEDURE).
YES - After repairing the trouble part, check whether DTC occurs or not.
INSPECTION PROCEDURE
1. PREPARATION
1. Turn the ignition switch to LOCK.
2. Disconnect the battery negative cable from the battery and wait for at least 3 minutes.
3. Remove the DAB module and disconnect the DAB connector.
4. Disconnect the connectors of the PAB, SAB, CAB, BPT, FIS and SIS.
5. Disconnect the SRSCM connector.
2. CHECK POWER TO OC SENSOR
A. Connect the battery negative cable to the battery.
B. Turn the ignition switch to ON.
C. Measure voltage between the terminal 1 of OC Sensor harness connector and chassis ground.
specification(voltage) : Battery voltage
D. Is the measured voltage within specification?
YES - Check short to battery line.
NO - Repair or replace the wiring harness between the OC Sensor and ignition switch.
3. CHECK SHORT TO BATTERY LINE
A. Measure voltage between the terminal 2 of OC Sensor harness connector and chassis ground.
specification(voltage) : Approximately 0 V
B. Is the measured voltage within specification?
YES - Check short to ground.
NO - Repair the short to battery line circuit on wiring harness between the OC Sensor and the SRSCM.
4. CHECK SHORT TO GROUND
A. Turn the ignition switch to LOCK.
B. Disconnect the battery negative cable from the battery.
C. Measure resistance between the terminal 2 of OC Sensor harness connector and chassis ground.
D. Measure resistance between the terminal 2 and 3 of OC Sensor harness connector
Specification(resistance) : Infinite
E. Is the measured resistance within specification?
YES - Check OC Sensor Circuit.
NO - Repair or replace the wiring harness between the OC Sensor and the SRSCM.
5. CHECK OC SENSOR CIRCUIT
A. Measure resistance between the terminal 2 of OC Sensor harness connector and the terminal 23 of the SRSCM harness connector(B).
specification(resistance) : below 1 ohm
B. Is the measured resistance within specification?
YES - Check OC Sensor.
NO - Repair or replace the wiring harness between the OC Sensor and the SRSCM.
6. CHECK OC SENSOR
A. Replace the OC Sensor with a new one.
B. Install the DAB module and connect the DAB connector.
C. Connect the connectors of the PAB, SAB, CAB, BPT, FIS and SIS.
D. Connect the SRSCM connector.
E. Connect the battery negative cable to the battery.
F. Connect the a Hi-Scan(Pro) the the data link connector.
G. Turn the ignition switch to ON and check the vehicle again.
H. Does Hi-Scan(Pro) indicate any DTC related to OC Sensor?
YES - Go to next step.
NO - Replace the OC Sensor.
7. CLEAR THE DTC AND CHECK THE VEHICLE AGAIN
1. Install the DAB module and connect the DAB connector.
2. Connect the connector of the PAB, SAB, CAB, BPT, FIS and SIS.
3. Connect the SRSCM connector.
4. Connect the battery negative cable to the battery.
5. Connect a Hi-Scan (Pro) to the data link connector.
6. Turn the ignition switch to ON.
7. Clear the DTC stored in the SRSCM memory with the Hi-Scan (Pro)
8. Turn the ignition switch to LOCK and wait for at least 30 seconds.
9. Turn the ignition switch to ON and wait for at least 30 seconds.
10. Check the vehicle again with the Hi-Scan(Pro).
Does the above DTC(s) go off?
YES - Problem is intermittent or was repaired and SRSCM memory was not cleared.
NO - Replace the SRSCM with a new one and then check the vehicle again. At this time, if the vehicle normally operates with a new one, the fault may be the SRSCM. Replace the SRSCM.