Restraint Troubleshooting

B1388

B1391

DTC Description

The Seat Track Position Sensor (STPS) circuit consists of the SRSCM and two STPS. The SRSCM sets above DTC(s) if it detects open or short to battery line on the STPS circuit. The "Seat Forward" status currently represents a seat position in which the deployment of the second stage airbag is prohibited.

DTC Detecting Condition






Specification






Schematic Diagram






Terminal & Connector Inspection
Refer to the DESCRIPTION in this TROUBLESHOOTING part.

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

2. CHECK OPEN CIRCUIT
(1) Disconnect the STPS connector.
(2) Measure resistance between the terminal 1(6) of STPS harness connector and the terminal 30(29) of SRSCM harness connector(B).

Specification(resistance) : below 1 Ohm






(3) Is the measured resistance within specification?
Yes
- Check short to ground.
No
- Repair the open circuit on wiring harness between the STPS and the SRSCM.

3. CHECK SHORT TO BATTERY LINE
(1) Connect the battery negative cable to the battery.
(2) Turn the ignition switch to ON.
(3) Measure voltage between the terminal 1(6) of STPS harness connector and chassis ground.

Specification(voltage) : Approximately 0 V






(4) Is the measured voltage within specification?
Yes
- Check the STPS.
No
- Repair the short to battery line circuit on wiring harness between the STPS and the SRSCM.

4. CHECK THE SEAT TRACK POSITION SENSOR (STPS)
(1) Measure current between the terminal 1(6) of STPS and 30(29) of SRSCM.

Specification (current) : 12 ~ 17 mA (Rearward status), 5 ~ 7 mA (Forward status)

(2) Is the measured current within specification?
Yes
- Go to next stop.
No
- Replace the STPS.

5. CLEAR THE DTC AND CHECK THE VEHICLE AGAIN
Refer to the DESCRIPTION in this TROUBLESHOOTING part.