In contrast to the
initial one-stage airbag systems, newer restraint systems involve complex
logic to select, or alternatively suppress, various levels of safety
system deployment. Inherent to an advanced Restraint System is the ability
to discern information regarding passenger occupancy. It is intended that
these inputs be provided through the weight measuring OC system. The
object of such safety system is to reduce the risk and level of injuries
by automatically adapting the airbag(s) and seat belt pretensioner to the
driving status of the vehicle, its occupants, and the crash severity.
The current OC system
covered in this specification continually senses and classifies the front
passenger side seat. OCS is utilizing a robust weight measuring
technology. Thus, if any of the following conditions occur, 'command zero'
and 'accuracy check' should be performed. The weight classification ECU or
any of the sensors is replaced. The vehicle is brought to the repair shop
due to an accident or a crash even though the severity seems to be
minor.
The passenger airbag ON
indicator is not illuminated when the passenger seat is not occupied. The
passenger airbag ON indicator is delayed more than 10 seconds to be turned
off when an adult passenger seats in. The passenger seat is removed from
the vehicle and re-assembled. Any accessories (side table, seatback table
and seat cover, etc) are replaced or installed.
The SRSCM sets DTC B1324
if there is any error in communication between Weight Classification
System ECU and SRSCM.
Item
|
Detecting
Condition
|
Possible cause
|
DTC Strategy
|
|
| •
|
Poor connection of connected
part. |
|
Enable Conditions
|
|
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.
|
|
|
▶
Intermittent failure, system is OK at this moment. Do not
change WCS(= Weight Classification System).
▶ Fault is intermittent caused by poor contact in
the connector/wiring harness 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 and Go
to "WCS Reset"
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 and Go to "WCS Reset" procedure.
|
|
|
▶ Go to
"Power Circuit Inspection"
procedure.
|
|
Check for an open or
short circuit in the WCS Power Circuit.
| 1. |
Disconnect WCS connector from wiring
harness. |
| 2. |
Ignition "ON" & Engine "OFF".
| (1) |
Measure voltage between terminal "Supply
voltage" and chassis ground.
Specification :
Battery Voltage
| |
| (2) |
Is the measured voltage within
specifications?
|
|
▶ Go
to "Communication K LINE Inspection"
procedure.
|
|
|
▶
Substitute the SRS main harness or WCS Module and check
for proper operation.
If the
problem is corrected, replace SRS main harness or WCS
Module and then go to "Verification of Vehicle Repair"
procedure and Go to "WCS Reset"
procedure.
|
| |
Communication K LINE Inspection
| 1. |
Ignition "ON" & Engine "OFF" and Using a
scan tool, clear the DTC. |
| 3. |
Disconnect the battery negative cable, then
disconnect the positive cable, and wait at least one
minutes. |
| 4. |
Disconnect the WCS MODULE from the WCS wiring
harness. |
| 5. |
Disconnect the SRSCM from the WCS wiring
harness. |
| 6. |
Measure resistance between of the
Communication K LINE wiring connector and BCM harness
connector.
Specification : approx. 1 Ω
below
| |
| 7. |
Is the measured resistance within
specifications?
|
|
▶ Go to
"WCS Reset" procedure.
|
|
|
▶
Substitute the SRS main harness or WCS Module or SRSCM and
check for proper operation.
If the
problem is corrected, replace SRS main harness WCS Module or
SRSCM and then go to "Verification of Vehicle Repair"
procedure and Go to "WCS Reset"
procedure.
|
|
WCS Reset
| 1. |
Ignition "OFF", connect
scantool. |
| 2. |
Ignition "ON" & Engine "OFF", select
Weight Classification System and select "WCS Reset"
mode. |
| 3. |
You will see comments and current weight
measured. |
| 4. |
Make sure the measure weight is caused by
occupant or tools or interference. |
| 5. |
And then press "ENTER"
Specification : Approx.
-4.0 kg ~ +4.0kg
| |
| 6. |
The 'WCS Reset' operation will take 3~10
second. |
| 7. |
Make sure that there should not be vibration
or weight adding to the passenger front seat.
|
| 8. |
If the 'WCS Reset' operation is finished
successfully, you will see the following screen.
Specification : Approx.
-4.0 kg ~ +4.0kg
| |
| 9. |
Is the displayed parameter the same as the
above 7 figure?
|
|
▶ WCS reset
is performed correctly.
▶ Go to
"Verification of Vehicle Repair"
procedure.
|
|
|
▶ WCS reset
isn't performed correctly.
▶ Go to
the applicable troubleshooting
procedure.
|
|
| Verification of Vehicle
Repair |
After a repair, it is
essential to verify that the fault has been corrected.
| 1. |
Connect scantool and select "Diagnostic
Trouble Codes(DTC)" mode. |
| 2. |
Using a scantool, clear the
DTC. |
| 3. |
Operate the vehicle within DTC Enable
conditions in General information. |
| 4. |
Are any DTC present ?
|
|
▶ Go to the
applicable troubleshooting procedure.
|
|
|
▶ System is
performing to specification at this
time.
|
|
