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. |
Dual output type
airbag deploys two bags in sequence within specified time difference. It
can protect driver with less impact of gas expention force, that can
reduce driver's injury. Constituent is the same as single output type
airbag.
The SRSCM sets DTC
B1481 if the measured resistance value of DAB circuit is more than the
threshold value.
The SRSCM sets DTC
B1482 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
|
B1481
|
|
B1482
|
|
Diagnostic
Time
|
Qualification
|
|
De-Qualification
|
|
Test Condition
|
Resistance
|
Ignition ON
|
1.6 Ω ≤ DAB resistance ≤ 4.7
Ω
|
| 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 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 PCAB
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.2"
and "High.2" 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 clock spring harness.
|
Lay Removed DAB facing upward for
unexpected air bag
deploy. | |
| 4. |
Measure resistance between terminal "Low.2"
and "High.2" 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 |
Refer to the
DESCRIPTION in this TROUBLESHOOTING
section.
