Air bag warning lamp
is located at cluster. When key is in 'ignition on' position, SRSCM
performs diagnosis of overall air bag system.If there's no fault, air bag.
Warning lamp in cluster flickers for a whlie and then goes out. SRSCM
measures voltage of out terminal of warning lamp to check if warnning lamp
is operated in accordance with signal SRSCM sends.
The SRSCM sets DTC
B2500 if there is an open circuit of short to ground in airbag dircuit
harness.
Item
|
Detecting
Condition
|
Possible
cause
|
DTC Strategy
|
|
| •
|
Burnt-out warning
lamp. |
| •
|
Open circuit in warning lamp
harness. |
| •
|
Short circuit in warning lamp
harness. |
|
Lamp "OFF"
|
Enable
Conditions
|
|
Diagnostic
Time
|
Qualification
|
| •
|
More than 0.3 ~ 0.7
sec | |
De-Qualification
|
| •
|
More than 2.5 ~ 15.5
sec | |
| 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 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 "Main Harness Circuit Inspection"
procedure. |
| Main Harness Circuit
Inspection |
| 2. |
Disconnect the battery (-) terminal cable
from the battery, and wait at least ane
minutes. |
| 3. |
Disconnect SRSCM main harness
connector. |
| 4. |
Connect the battery (-) terminal cable to
the battery and Ignition "ON" & Engine
"OFF". |
| 5. |
Measure voltage between Air Bag IND terminal
of the SRSCM harness connector and chassis ground.
Specification : Approx. Batt
Voltage
|
|
| 6. |
Is the measured voltage within
specifications?
▶ Check warning lamp 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.
▶ Check airbag fuse, junction block, Warning
Lamp, harness between junction block and SRSCM . Repair as necessary
and go to "Verification of Vehicle Repair"
procedure. |
| Verification of Vehicle
Repair |
Refer to the
DESCRIPTION in this TROUBLESHOOTING
section.
