B1389

B1389

Component Location:

General Description
STPS located underneath driver seat detects horizontal position of driver seat and delivers it to SRSCM. Signal of STPS is the one of major parameters that determine the way dual output type airbag deploys.

DTC Description
The SRSCM sets DTC B1389 if there is any fault in STPS circuit.

DTC Detecting Condition:

Schematic Diagram:

Monitor Scantool Data
1. Ignition "OFF", connect scantool.
2. Ignition "ON"& Engine "OFF", select "Diagnostic Trouble Codes (DTC)" mode.
3. Monitor diagnostic trouble code and present of trouble code.
4. Using a scan tool, clear the DTC.






5. Is DTC present problem?

YES
a. Go to "W/Harness Inspection" procedure.

NO
a. Displaying nothing (no DTC) or DTC with label "H" (historical) shows that Fault is intermittent caused by poor contact in the part's and/or SRSCM connector or was repaired and SRSCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
b. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.

Terminal and Connector Inspection
1. Many malfunctions in the electrical system are caused by poor harness and terminals.Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?

YES
a. Repair as necessary and then go to "Verification of Vehicle Repair" procedure.

NO
a. Go to "Component Inspection" procedure.

Component Inspection
1. Ignition "ON" & Engine "OFF" and Using a scan tool, clear the DTC.
2. Ignition "OFF".
3. Disconnect the battery (-) terminal cable from the battery, and wait at least one minute.
4. Disconnect STPS connector.
5. Substitute the STPS and check for proper operation.
6. Is DTC present problem?

YES
a. Substitute a known-good SRSCM, and check for proper operation. If the problem is corrected, replace SRSCM and then go to "Verification of Vehicle Repair" procedure.
b. Substitute the SRS main harness and check for proper operation. If the problem is corrected, replace SRS main harness and then go to "Verification of Vehicle Repair" procedure.

NO
a. Substitute a known-good STPS, and check for proper operation. If the problem is corrected, replace STPS and then go to "Verification of Vehicle Repair" procedure.

Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes (DTC)" mode
2. Using a scan tool, clear the DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTC present?

YES
a. Go to the applicable troubleshooting procedure.

NO
a. System is performing to specification at this time.