Mitsubishi Evolution X. Manual — part 699
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-243
STEP 5. Check the harness wires for short circuit to power
supply between SRS-ECU connector C-36 (terminal No.43
and 44) and passenger's seat belt pre-tensioner connector
D-40 (terminal No.2 and 1).
Q: Are the harness wires between SRS-ECU connector
C-36 (terminal No.43 and 44) and passenger's seat belt
pre-tensioner connector D-40 (terminal No.2 and 1) in
good condition?
YES : Go to Step 6.
NO : Replace the harness wires between SRS-ECU
connector C-36 and passenger's seat belt
pre-tensioner connector D-40. Then go to Step 6.
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 B1C48 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC B1C49: Front Passenger's Pre-tensioner (Squib) System (Squib Circuit Open)
SEAT BELT
PRE-TENSIONER (RH)
CONNECTOR
LOCK
SWITCH
CONNECTOR
LOCK SWITCH
SRS-ECU
Seat Belt Pre-Tensioner (RH) (Squib) Circuit
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-244
CAUTION
If DTC B1C49 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 pre-tensioner will deploy.
.
DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the passenger's seat
belt pre-tensioner (squib).
.
TROUBLESHOOTING HITS
• Open circuit in the passenger's seat belt pre-ten-
sioner (squib) circuit
• Improper connector contact
• 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
• MB991884: Resister harness
AC708951AD
Connector: C-36
C-36 (Y)
AC708954 AH
Connector: D-40
D-40 (B)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-245
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 Cope with Intermittent
Malfunction
).
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-246
STEP 3. Check the passenger's seat belt pre-tensioner.
(1) Disconnect the negative battery terminal.
(2) Disconnect passenger's seat belt pre-tensioner connector
D-40. 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 D-40 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 B1C49 set?
YES : Go to Step 4.
NO : Replace the passenger's seat belt with pre-tensioner
(Refer to
). Then go to Step 5.
AC609576AB
Pre-tensioner
Harness side
connector
Locking
button
Flat-tipped
screwdriver
AC301553CC
D-40 Harness side
connector
MB991884
(Resistor harness)
MB991865
(Dummy resistor: 3 )
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст