Mitsubishi Evolution X. Manual — part 679
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-163
STEP 6. Short circuit check between the F-04 curtain air
bag module harness side connector and the D-10
intermediate harness.
(1) Disconnect the negative battery terminal.
DANGER
To prevent the air bag from deploying unintentionally,
disconnect the curtain air bag module connector F-04
to short the squib circuit.
(2) Disconnect curtain air bag module (RH) F-04. Use a
flat-tipped screwdriver to unlock the locking button at the
harness side connector by withdrawing it toward you in two
stages, and then disconnect the connector.
(3) Disconnect the D-10 intermediate connector (connection
between curtain air bag harness and floor harness).
(4) Because the short spring is installed to the D-10
intermediate connector (curtain air bag harness side), insert
a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch) thick]
between terminals 1, 2 and the short spring to release the
short spring.
CAUTION
Do not insert a probe into the terminal from its front side
directly, as the connector contact pressure may be weak-
ened.
(5) Check for continuity between the D-10 intermediate
connector (curtain air bag harness side) terminal No.1 and
2.
It should be open circuit.
Q: Is it open circuit?
YES : Replace the curtain air bag module (RH) (Refer to
). Then go to Step 7.
NO : Repair the wiring harness.
AC609834AB
Locking
button
Flat-tipped
screwdriver
Inflator
Curtain air bag wiring
harness connector
AC700119
D-10 Intermediate
connector (module side )
22 mm or more
Cable tie
Short spring
AJ
AC608812GZ
D-10 Intermediate connector
(Curtain air bag harness side)
(rear view)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-164
STEP 7. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC B1B23 set?
YES : Replace SRS-ECU (Refer to
NO : Intermittent Malfunction (Refer to GROUP 00, How to
Use Troubleshooting/Inspection Service Points
− How
to Cope with Intermittent Malfunction
).
DTC B1B54: Seat Belt Switch (RH) Circuit (Ground Side) Shorted
DTC B1B55: Seat Belt Switch (RH) Circuit (Power Supply Side) Shorted
DTC B1B56: Seat Belt Switch (RH) Circuit Open
SEAT BELT BUCKLE
SWITCH
PASSENGER'S
SIDE
SRS-ECU
HALL IC
Seat Belt Switch Circuit
SEAT BELT WARNING
TONE ALARM
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-165
CAUTION
If DTC B1B54, B1B55 or B1B56 are set in the
SRS-ECU, always diagnose the CAN main bus
lines.
.
CIRCUIT OPERATION
The SRS-ECU determines whether the seat belt is
fastened or not according to the connection location
of the seat belt switch in the seat buckle.
.
DTC SET CONDITIONS
DTC is set when the resistance between input termi-
nals of the seat belt switch in the SRS-ECU is with-
out the standard value.
.
TROUBLESHOOTING HINTS
• Malfunction of the seat belt switch
• Damaged wiring harnesses or connectors
• Malfunction of the SRS-ECU
DIAGNOSIS
Required Special Tools:
• MB991222: Probe
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A (Vehicles with
CAN communication system)
AC708951AD
Connector: C-36
C-36 (Y)
AC708954 AC
Connector: D-37
D-37 (B)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-166
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the
."
(2) Connect scan tool MB991958 to the data link connector.
(3) Turn the ignition switch to the "ON" position.
(4) Diagnose the CAN bus line.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
).
STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Go to Step 3.
NO : There is an intermittent malfunction such as poor
engaged connector(s) or open circuit (Refer to
GROUP 00, How to Cope with Intermittent
Malfunction
).
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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