Mitsubishi Evolution X. Manual — part 729
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-363
.
CIRCUIT OPERATION
• The SRS warning light illuminates when the igni-
tion switch is turned to the "ON" position and
goes out after approximately seven seconds if
there is not a malfunction in the SRS system.
• SRS-ECU sends the SRS warning light signal to
the combination meter via the CAN communica-
tion.
• As a cause, the failure of CAN bus line, combina-
tion meter, or SRS-ECU is suspected.
.
TROUBLESHOOTING HINTS
• Damaged wiring harness and connectors
• Combination meter malfunction
• Malfunction of 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)
AC708950
Connector: C-04
AR
AC708951AC
C-37 (Y)
Connector: C-37
AC708972BF
Connectors: C-309, C-317
Junction block
C-317
C-309 (B)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-364
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.
Use scan tool MB991958 to diagnose the CAN bus lines.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
Q: Is the check result satisfactory?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
).
STEP 2. SRS warning light check
(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.
(3) Connect the negative battery terminal.
(4) Ignition switch: ON
Q: Does the lamp illuminate?
YES : Replace SRS-ECU (Refer to
NO : Go to Step 3.
STEP 3. Wiring harness inspection between fusible link
(34) and C-04 combination meter connector terminal No. 2
NOTE: Prior to the wiring harness inspection, check the
ETACS-ECU connectors C-309 and C-317, and repair if neces-
sary.
• The SRS warning light inspection for open and short circuit
Q: Is the check result normal?
YES : Replace the combination meter. (Refer to GROUP
54A, Combination Meter
NO : Repair the wiring harness.
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
AC506734
A
AD
Lock lever
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-365
Inspection Procedure 4: The SRS warning light does not go out.
.
CIRCUIT OPERATION
• The SRS warning light illuminates when the igni-
tion switch is turned to the "ON" position and
goes out after approximately seven seconds if
there is not a malfunction in the SRS system.
• SRS-ECU sends the SRS warning light signal to
the combination meter via the CAN communica-
tion.
• As a cause, the failure of CAN bus line, combina-
tion meter, or SRS-ECU is suspected.
ETACS-ECU
COMBINATION METER
CPU
FUSIBLE
LINK
34
CAN DRIVE
CIRCUIT
IGNITION
SWITCH (IG1)
IG1
RELAY
INTERFACE
CIRCUIT
CAN TRANSCEIVER
CIRCUIT
LED DRIVE
CIRCUIT
JOINT CONNECTOR
(CAN1)
SRS-ECU
SRS Warning Light Circuit
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-366
.
TROUBLESHOOTING HINTS
• Damaged wiring harness and connectors
• Combination meter malfunction
• Malfunction of 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)
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.
Use scan tool MB991958 to diagnose the CAN bus lines.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
Q: Is the check result satisfactory?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
).
STEP 2. Using scan tool MB991958, check actuator test
Check the combination meter actuator tests.
Item No. 07: Indicator 1
Q: Does the SRS warning light turn on and off normally?
YES : Go to Step 3.
NO : Replace the combination meter. (Refer to GROUP
54A, Combination Meter
AC608435
Data link connector
MB991827
MB991824
MB991910
AB
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