Mitsubishi Evolution X. Manual — part 662
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-95
DTC B1B10: Driver's Knee Air Bag (Squib) System (Shorted To Squib Circuit Ground)
CAUTION
If DTC B1B10 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 front impact sensors and
the front air bag analog G-sensor. If the impact is
over a predetermined level, the SRS-ECU sends an
ignition signal. At this time, if the front air bag safing
G-sensor is on, the knee air bag module will deploy.
.
DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the knee air bag mod-
ule (squib).
.
TROUBLESHOOTING HITS
• Damaged wiring harnesses or connectors
• Short to the ground in the knee air bag module
(squib) harness
• Malfunction of the SRS-ECU
KNEE AIR BAG
MODULE (SQUIB)
SRS-ECU
CONNECTOR LOCK SWITCH
CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF
NOTE
:
Knee Air Bag Module (Squib) Circuit
AC708951AC
C-37 (Y)
Connector: C-37
AC708950AB
Connector: C-39
C-39 (B)
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-96
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,
).
STEP 2. 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 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
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-97
STEP 3. 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 check the
diagnostic trouble code.
Q: Is DTC B1B10 set?
YES : Go to Step 4.
NO : Replace the driver’s knee air bag module (Refer to
). Then go to Step 6.
AC609126AC
Locking button
Flat-tipped
screwdriver
Pre-tensioner
Harness side
connector
AC301553CA
C-39 Harness side
connector
MB991884
(Resistor harness)
MB991865
(Dummy resistor: 3 )
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-98
STEP 4. 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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