Mitsubishi Evolution X. Manual — part 667
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-115
(5) Check for continuity between C-37 harness side connector
terminals 1 and 2.
It should be an open circuit.
Q: Is it open circuit?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1B13 sets,
replace the SRS-ECU (Refer to
). Then go
to Step 7.
NO : Go to Step 6.
STEP 6. Check the harness for short circuit between
SRS-ECU connector C-37 (terminal No.35 and 36) and knee
air bag module connector C-39 (terminal No.2 and 1).
Q: Are harness wires between SRS-ECU connector C-37
(terminal No.1 and 2) and knee air bag module
connector C-39 (terminal No.2 and 1) in good condition?
YES : Go to Step 7.
NO : Replace the harness wires between SRS-ECU
connector C-37 and knee air bag module connector
C-39. Then go to Step 7.
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 B1C36 set?
YES : Return to Step 1.
NO : The procedure is complete.
AC608812FI
C-37 Harness side
connector (front view)
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-116
DTC B1B18: Curtain Air Bag Module (LH) (Squib) System (Shorted to Squib Circuit Ground)
CURTAIN AIR BAG
MODULE (SQUIB) (LH)
CONNECTOR
LOCK
SWITCH
CONNECTOR
LOCK
SWITCH
SRS-ECU
NOTE
: CONNECTOR COUPLED : ON
CONNECTOR UNCOUPLED : OFF
Curtain Air Bag Module (Squib) (LH) Circuit
CONNECTOR
LOCK SWITCH
AC708951AD
Connector: C-36
C-36 (Y)
AC708955AB
Connector: D-15
D-15 (Y)
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-117
CAUTION
If DTC B1B18 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 (LH) 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 (LH) (squib).
.
TROUBLESHOOTING HITS
• Damaged wiring harnesses or connectors
• Short to the ground in the curtain air bag module
(LH) (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
AC708970AB
Connector: F-28
F-28 (B)
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-118
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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