B1490
DTC B1490The passenger occupant classification 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:
DTC DETECTING CONDITION
Schematic Diagram:
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 OF INSPECTION
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 OPEN CIRCUIT
a. Measure resistance between the terminal 4 of OC module harness connector and the terminal 36 of SRSCM harness connector (B).
b. Measure resistance between the terminal 5 of OC module harness connector and the terminal 37 of SRSCM harness connector (B).
specification(resistance) : below 1 ohm
c. Is the measured resistance within specification?
YES - Check short to ground.
NO - Repair the open circuit on wiring harness between the OC module and the SRSCM.
3. CHECK SHORT TO GROUND
a. Measure resistance between the terminal 4 of OC module harness connector and chassis ground.
specification(resistance) : infinite
b. Is the measured resistance within specification?
YES - Check short circuit.
NO - Repair or replace the wiring harness between the OC module and the SRSCM.
4. CHECK SHORT CIRCUIT
a. Measure resistance between the terminal 4 and 5 OC module harness connector.
Specification(resistance) : infinite
b. Is the measured resistance within specification?
YES - Go to next stop.
NO - Repair or replace the wiring harness between the OC module and the SRSCM.
5. CHECK SHORT TO BATTERY LINE
a. Connect the battery negative cable to the battery.
b. Turn the ignition switch to ON.
c. Measure voltage between the terminal 4 of OC module harness connector and chassis ground.
specification(voltage) : Approximately 0 V
d. Is the measured voltage within specification?
YES - Check the OC module.
NO - Repair the short to battery line on the wiring harness between the OC module and the SRSCM.
6. CHECK THE OC MODULE
a. Replace the OC module with a new one.
b. Turn the ignition switch to LOCK.
c. Connect the OC module connector.
d. Connect the SRSCM connector.
e. Connect the battery negative cable to the battery.
f. Connect Hi-Scan(Pro) to the data link connector.
g. Turn the ignition switch to ON and check the vehicle again.Does Hi-Scan(Pro) indicate any DTC related to OC module?
YES - Go to next step.
NO - Replace OC module.
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, BUPT, 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.
NOTE Be sure to perform OCS(PODS) reset with Hi-Scan(Pro) after clearing the OCS related DTC.