Driver Air bag module
(hereinafter referred to DAB) located at center of steering wheel protects
driver by reducing impact of collision. DAB is consist of air bag, pat
cover and inflator. There are power,circuit for ignition, gas generator
and diffuser screen in inflator. Air bag reduces impact of collision by
fillied up gas. In collision, pat cover splits and through this crack, air
bag emerges and deploys. Inflator generates gas that expands air bag.
Clock spring is located between steering wheel and column. It connects
SCSRM to DAB.
|
Never measure resistance of DAB directly,
Current of measuring device may cause unexpected air bag
deploy. |
The SRSCM sets DTC B1347
if the measured resistance value of DAB 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 ≤ DAB
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.
horoughly 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. |
Remove the DAB module and connect the dummy
(0957A-38200) and dummy adapter (0957A-2G000) to DAB connector of
the clock spring harness connector.
|
If dummy and dummy adaptor are not able
to be prepared, use a known-good DAB or 2Ω
resistor. |
|
Lay Removed DAB facing upward for
unexpected air bag deploy
. | |
| 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
"Clock Spring Circuit Inspection" procedure.
|
|
|
▶
Substitute a known-good DAB assembly, and check for proper
operation.
If the problem is
corrected, replace DAB and then go to "Verification of Vehicle
Repair"
procedure.
|
|
Clock Spring Circuit Inspection
| 2. |
Disconnect the battery (-) terminal cable from
the battery and wait at least one
minutes. |
| 3. |
Remove DAB module and disconnect SRSCM
connector of the clock spring harness.
|
Lay Removed DAB facing upward for
unexpected air bag
deploy. | |
| 4. |
Measure resistance between terminal "Low" and
"High" of the Clock Spring harness connector.
Specification : approx. 1 Ω
below
| |
| 5. |
Is the measured resistance within
specifications?
|
|
▶ Go to
"Main harness circuit inspection" procedure.
|
|
|
▶
Substitute the Clock spring and check for proper
operation.
If the problem is
corrected, replace Clock spring 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. |
Remove DAB module and disconnect SRSCM
connector of the main harness.
|
Lay Removed DAB facing upward for
unexpected air bag
deploy. | |
| 4. |
Measure resistance between terminal "Low" and
"High" of the DAB 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.
|
|
