Mitsubishi Evolution X. Manual — part 673
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-139
STEP 6. Short circuit check between the F-28 curtain air
bag module harness side connector and the D-15
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-28
to short the squib circuit.
(2) Disconnect curtain air bag module (LH) F-28. 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-15 intermediate connector (connection
between curtain air bag harness and floor harness).
(4) Because the short spring is installed to the D-15
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-15 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 (LH) (Refer to
). Then go to Step 7.
NO : Repair the wiring harness.
AC609928AB
Locking
button
Flat-tipped
screwdriver
Inflator
Curtain air bag wiring
harness connector
AC700119
D-15 Intermediate
connector (module side )
22 mm or more
Cable tie
Short spring
AH
AC608812
D-15 Intermediate connector
(Curtain air bag harness side)
(rear view)
FM
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-140
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 B1B1B 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 B1B20: Curtain Air Bag Module (RH) (Squib) System (Shorted to Squib Circuit Ground)
SRS-ECU
NOTE
: CONNECTOR COUPLED : ON
CONNECTOR UNCOUPLED : OFF
Curtain Air Bag Module (Squib) (RH) Circuit
CURTAIN AIR BAG MODULE
(SQUIB) (RH)
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK
SWITCH
CONNECTOR
LOCK SWITCH
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-141
CAUTION
If DTC B1B20 is set in the SRS-ECU, always diag-
nose the CAN main bus line.
.
CIRCUIT OPERATION
• The SRS-ECU judges how severe a collision is
by detecting signals from the side impact sensors
installed on the lower side of the center pillar. If
the impact is over a predetermined level, the
SRS-ECU sends an ignition signal. At this time, if
the side collision safing G-sensor is on, the SRS
air bag will inflate.
• The ignition signal is input to the curtain air bag
module (RH) to inflate the curtain air bag.
.
DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the curtain air bag
module (RH) (squib).
.
TROUBLESHOOTING HITS
• Damaged wiring harnesses or connectors
• Short to the ground in the curtain air bag module
(RH) (squib) harness
• Malfunction of the SRS-ECU
DIAGNOSIS
Required Special Tools:
• 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)
• MB991865: Dummy resistor
• MB991866: Resister harness
AC708951AD
Connector: C-36
C-36 (Y)
AC708955AC
Connector: D-10
D-10 (Y)
AC708970AC
Connector: F-04
F-04 (B)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-142
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) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) 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 Use Troubleshooting/Inspection
Service Points
− How to Cope with Intermittent
Malfunctions
).
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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