Mitsubishi Evolution X. Manual — part 677
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-155
STEP 3. Check by dummy resistor connection.
(1) Disconnect the negative battery terminal.
(2) Disconnect the D-10 intermediate connector (connection
between curtain air bag harness and floor harness).
(3) Connect special tool MB991865 to special tool MB991866.
CAUTION
Do not insert a probe into the terminal from its front side
directly, as the connector contact pressure may be weak-
ened.
(4) Insert the probe of resistor harness, to which the dummy
resistor is installed, from the back of D-10 intermediate
connector (floor harness side).
(5) Connect the negative battery terminal.
(6) After erasing the diagnostic trouble code memory, check the
diagnostic trouble code again.
(7) Disconnect the negative battery terminal.
Q: Is DTC B1B22 set?
YES : Go to Step 4.
NO : Go to Step 5.
AC507310
D-10 Intermediate connector
(Curtain air bag harness side)
D-10
Intermediate
connector
(Floor harness side)
AI
MB991865
(Dummy resistor: 3 )
MB991866
(Resistor harness)
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-156
STEP 4. Resistance measurement at the C-36 SRS-ECU
connector and the D-10 intermediate connector.
(1) Disconnect the negative battery terminal.
(2) While pushing the part "A" indicated in the figure of the
harness side connector, turn the lock lever to the direction
of the arrow to release the lock lever, and disconnect the
C-36 SRS-ECU connector.
DANGER
To prevent the air bag from deploying unintentionally,
disconnect the intermediate connector D-10 to short
the squib circuit.
(3) Disconnect the D-10 intermediate connector (connection
between curtain air bag harness and floor harness).
CAUTION
The short spring may not be released due to the insuffi-
cient insertion. Therefore, insert the insulator for 4 mm (0.6
inch) or more.
(4) Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch)
thick] between terminal 39, 40 and the short spring to
release the short spring.
CAUTION
Do not insert a probe into the terminal from D-10 interme-
diate connector front side directly, as the connector con-
tact pressure may be weakened.
(5) Check for continuity between the following terminals. It
should be less than 2 ohms.
• SRS-ECU connector C-36 (terminal No.39) and the
intermediate connector D-10 (terminal No.2)
• SRS-ECU connector C-36 (terminal No.40) and the
intermediate connector D-10 (terminal No.1)
Q: Does continuity exist?
YES : Go to Step 6.
NO : Repair the wiring harness between the C-36 harness
side connector terminal No. 39, 40 and the D-10
intermediate connector (floor harness side) terminal
No. 2, 1.
AC609027
A
AB
Lock lever
AC507303 BZ
A
A
C-36 Harness side
connector (front view)
Section
A - A
Cable tie
Short spring
4 mm (0.16 inch) or more
Terminal
AC608812GX
C-36 Harness side
connector (front view)
D-10 Intermediate connector
(Curtain air bag harness side)
(rear view)
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-157
STEP 5. Resistance measurement at the D-10 intermediate
connector terminal No. 1, 2 and the F-04 curtain air bag
module harness side connector terminal No. 1, 2.
(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.
(5) Connect special tool MB991884 to the removed F-04
harness side connector.
CAUTION
Do not insert a probe into the terminal from D-10 interme-
diate connector front side directly, as the connector con-
tact pressure may be weakened.
(6) Check for continuity between the following terminals.
It should be less than 2 ohms.
• Intermediate connector D-10 (terminal No.1) and resis-
tor harness connector terminal No.2)
• Intermediate connector D-10 (terminal No.2) and resis-
tor harness connector terminal No.1)
Q: Does continuity exist?
YES : Replace the curtain air bag module (squib) (Refer to
).
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
AC201287EK
F-04 Harness side
connector
MB991884
AC608812GY
Resistor
harness
connector
D-10 Intermediate connector
(Curtain air bag harness side)
(rear view)
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-158
NO : Repair the wiring harness.
STEP 6. 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 B1B22 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 B1B23: Curtain Air Bag Module (RH) (Squib) System (Short Circuit between Squib Circuit
Terminals)
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
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