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.
