Mitsubishi Evolution X. Manual — part 666
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SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-111
NOTE: *: The squib circuit connectors integrate a
"short" spring (which prevents the knee air bag mod-
ule from deploying unintentionally due to static elec-
tricity by shorting the positive wire to the ground wire
in the squib circuit when the connectors are discon-
nected) (Refer to
). Therefore, if connector
C-37 or C-39 is damaged or improperly engaged, the
short spring may not be released when the connector
is connected.
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
• MB991884: Resister harness
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,
).
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-112
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
).
STEP 3. Check SRS-ECU connector C-37 and Knee air bag
module connector C-39.
(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-37 SRS-ECU connector. Then connect the connector.
(3) After disconnecting the C-39 harness side connectors,
connect the connectors again. For the C-39 connector
disconnection, use a flat-tipped screwdriver to unlock the
locking button at the harness side connector by withdrawing
it to ward you in two stages, and then disconnect the
connector.
(4) Connector the negative battery terminal.
(5) Erase the diagnostic trouble code memory, and check the
diagnostic trouble code.
Q: Is DTC B1B13 set?
YES : Go to Step 4.
NO : The procedure is complete. It is assumed that DTC
B1B13 set because connector C-37 or C-39 was
engaged improperly.
AC506734
A
AD
Lock lever
AC609126AC
Locking button
Flat-tipped
screwdriver
Pre-tensioner
Harness side
connector
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SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-113
STEP 4. Check the knee air bag module.
(1) Disconnect the negative battery terminal.
(2) Disconnect knee air bag module connector C-39. 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) Connect special tool MB991865 to special tool MB991884.
(4) Connect special tool MB991884 to the C-39 harness side
connector.
(5) Connect the negative battery terminal.
(6) Erase diagnostic trouble code memory, and then check the
diagnostic trouble code.
Q: Is DTC B1C36 set?
YES : Go to Step 5.
NO : Replace the driver’s knee air bag module (Refer to
. Then go to Step 7.
AC609126AC
Locking button
Flat-tipped
screwdriver
Pre-tensioner
Harness side
connector
AC301553CA
C-39 Harness side
connector
MB991884
(Resistor harness)
MB991865
(Dummy resistor: 3 )
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SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-114
STEP 5. Check the knee air bag module circuit. Measure
the resistance at the SRS-ECU connector C-37.
(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-37 SRS-ECU connector.
DANGER
To prevent the knee air bag module from deploying
unintentionally, disconnect the knee air bag module
connector C-39 to short the squib circuit.
(3) Disconnect knee air bag module connector C-39. 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.
CAUTION
Insert an insulator such as a cable tie to a depth of 4mm
(0.16 inch) or more, otherwise the short spring will not be
released.
(4) 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.
AC506734
A
AD
Lock lever
AC609126AC
Locking button
Flat-tipped
screwdriver
Pre-tensioner
Harness side
connector
AC507302BJ
A
A
C-37 Harness side
connector (front view)
Section
A - A
Cable tie
Short spring
4 mm (0.16 inch) or more
Terminal
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