Passenger Air bag module
(hereinafter referred to PAB) located at passenger side crush pad protects
passenger by reducing impact of collision.
PAB is consist of air
bag, pat cover 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 PAB 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 B1485
if the measured resistance value of PAB circuit is more than the threshold
value.
The SRSCM sets DTC B1486
if the measured resistance value of PAB 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
|
B1485
|
|
B1486
|
|
Diagnostic
Time
|
Qualification
|
|
De-Qualification
|
|
Test Condition
|
Resistance
|
Ignition ON
|
1.6 Ω ≤ PAB
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 PAB module and connect the dummy
(0957A-38200) and dummy adapter (0957A-2E110) to PAB connector of
the clock spring harness connector.
|
If dummy and dummy adaptor are not able
to be prepared, use a known-good PAB or 2Ω
resistor. |
|
Lay Removed PAB 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 "Main harness circuit inspection"
procedure.
▶ Substitute a known-good PAB assembly, and
check for proper operation.
If the problem is corrected, replace PAB 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 PAB connector and SRSCM main
harness connector.
|
Lay Removed PAB facing upward for
unexpected air bag
deploy. | |
| 4. |
Measure resistance between terminal "Low.2"
and "High.2" of the PAB 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.
