Curtain Airbag
(hereinafter referred to CAB)is located at driver and passenger side of
headliner. It protects passenger's head and shoulder from fragments of
glass or something sharpen caused by overturn. CAB is consist of air bag
and inflator. Air bag reduces impact of collision by fillied up gas.
Inflator keeps gas and uses it to deploy air bag on
collision.
Never measure resistance of CAB directly,
Current of measuring device may cause unexpected air bag
deploy. |
The SRSCM sets DTC B1474
if the measured resistance value of DCAB circuit is less than the
threshold value.
*In this case, SRSCM
checks if there's any fault in circuit by sending current for a
while.
Item
|
Detecting
Condition
|
Possible cause
|
DTC Strategy
|
|
•
|
Poor connection of connected
part. |
•
|
Poor connection between shorting bar and
release pin. |
|
Enable Conditions
|
|
Threshold Value
|
|
Diagnostic Time
|
Qualification
|
|
De-Qualification
|
|
Test Condition
|
Resistance
|
Ignition ON
|
1.6Ω <
CAB resistance < 4.7Ω
|

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 scantool, 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
shorting bar/shorting bar release pin and 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 shorting bar/shorting bar
release pin and 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
"Squib Circuit Inspection"
procedure.
|
|
2. |
Disconnect (-) terminal cable from battery and
wait for 1 minutes or more. |
3. |
Disconnect CAB module and connect the dummy
(0957A-38200) and dummy adapter (0957A-2G000) to main harness
connector.
If dummy and dummy adaptor are not able
to be prepared, use a known-good CAB or 2Ω
resistor. | |
4. |
Connect (-) terminal cable to battery and
Ignition "ON" & Engine "OFF" and wait for 30 seconds or
more. |
5. |
Connect scantool to Data Link Connector(DLC)
and clear DTC with scantool and diagnose again.

|
6. |
Is DTC present problem ?

|
▶ Go to
"Main harness circuit inspection" procedure.
|

|
▶
Substitute a known-good CAB assembly, and check for proper
operation. If the problem is
corrected, replace CAB and then go to "Verification of Vehicle
Repair"
procedure.
|
|
Main harness Circuit Inspection
2. |
Disconnect the battery (-) terminal cable from
the battery, and wait at least one
minutes. |
3. |
Disconnect CAB connector and SRSCM main
harness connector. |
4. |
Measure resistance between terminal "Low" and
"High" of the CAB harness connector.
Specification
: approx. 1 Ω
below
| |
5. |
Is the measured resistance within
specifications?

|
▶
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.
|
|
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.
|
|