STPS located underneath
passenger seat detects horizental position of passenger seat and delivers
it to SRSCM.
Signal of STPS is the
one of major parameters that determine the way dual output type airbag
deploys.
The SRSCM sets DTC B1389
if there is any fault in STPS circuit.
Item
|
Detecting
Condition
|
Possible cause
|
DTC Strategy
|
•
|
Check current(PWM
type) | |
•
|
Poor connection of connected
part. |
|
Enable Conditions
|
|
Threshold Value
|
|
Diagnostic Time
|
Qualification
|
|
De-Qualification
|
|

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 ?

▶ Go to "W/Harness Inspection"
procedure.

▶ 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.
▶ 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?

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

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

▶ 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.
▶ 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.

▶ 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 |
Refer to the DESCRIPTION
in this TROUBLESHOOTING section.