Restraint Troubleshooting

B1448

B1449

B1450

DTC Description

The 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
Refer to the DESCRIPTION in this TROUBLESHOOTING part.

Inspection Procedure

1. PREPARATION
Refer to the DESCRIPTION in this TROUBLESHOOTING part.

2. CHECK POWER TO OC SENSOR
(1) Connect the battery negative cable to the battery.
(2) Turn the ignition switch to ON.
(3) Measure voltage between the terminal 1 of OC Sensor harness connector and chassis ground.

Specification(voltage) : Battery voltage






(4) 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
(1) Measure voltage between the terminal 2 of OC Sensor harness connector and chassis ground.

Specification(voltage) : Approximately 0 V






(2) 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
(1) Turn the ignition switch to LOCK.
(2) Disconnect the battery negative cable from the battery.
(3) Measure resistance between the terminal 2 of OC Sensor harness connector and chassis ground.
(4) Measure resistance between the terminal 2 and 3 of OC Sensor harness connector

Specification(resistance) : Infinite






(5) 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
(1) 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






(2) 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
(1) Replace the OC Sensor with a new one.
- Refer to "OC SENSOR" section in this SERVICE MANUAL.
(2) Install the DAB module and connect the DAB connector.
(3) Connect the connectors of the PAB, SAB, CAB, BPT, FIS and SIS.
(4) Connect the SRSCM connector.
(5) Connect the battery negative cable to the battery.
(6) Connect the a Hi-Scan(Pro) the the data link connector.
(7) Turn the ignition switch to ON and check the vehicle again.
(8) 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
Refer to the DESCRIPTION in this TROUBLESHOOTING part.