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 |
Refer to the
DESCRIPTION in this TROUBLESHOOTING
section.
