Mitsubishi Galant 9G. Manual — part 1462
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-258
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
scan tool
."
(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 Use Troubleshooting/Inspection
Service Points
− How to Cope with Intermittent
Malfunctions ).
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-259
STEP 3. Using scan tool MB991958, read the diagnostic
trouble code.
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) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOOK (OFF)" position.
Q: Is DTC B1530, B1531, B1532, B1533, B1534, B1535,
B1536, B1537, B1538, B1539, B1540, B1541, B1542,
B1543, B1545 or B1546 set?
YES : Carry out the troubleshooting of the passenger’s seat
belt switch system, the occupant classification-ECU
or the occupant classification sensor system (Refer to
<B1530,B1531, B1532, B1533, B1534,
B1535, B1536, B1537, B1538 or B1539>,
<B1540,B1541, B1542 or B1543> or
<B1545 or B1546>).
NO : Go to Step 4.
STEP 4 Using scan tool MB991958, check actuator test.
• Item No.02: Passenger’s seat belt warning light illumination
Q: Does the passenger’s seat belt warning light illuminate
or go out normally?
YES : Go to Step 5.
NO : Replace the passenger’s seat belt warning light
(Refer to GROUP 52A, Instrument Panel Assembly
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-260
STEP 5. Check the harness between SRS-ECU connector
C-121 (terminal No.42) and passenger’s seat belt warning
light C-07 (terminal No.3).
• Check the passenger’s seat belt warning light output lines
for open circuit.
NOTE: After inspecting intermediate connector C-22 inspect
the wiring harness. If intermediate connector C-22 is damaged,
repair or replace them. Refer to GROUP 00E, Harness Con-
nector Inspection . Then go to Step 6.
Q: Is the check result satisfactory?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1487 sets,
replace the SRS-ECU (Refer to
). Then go
to Step 6.
NO : Repair the harness wires. Then go to Step 6.
AC305362
CONNECTOR: C-121
C-121 (Y)
AH
SRS-ECU
C-121
HARNESS SIDE
CONNECTOR
(REAR VIEW)
42
31
38
27
21
41
28
39
22
30
25
47
36
33
44
34
45
37
48
26
29
23
40
32
43
35
46
24
B
A
AC305233CZ
CONNECTOR: C-07
HARNESS SIDE
AC305233 AI
CONNECTOR: C-22
C-22 (Y)
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-261
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 B1487 set?
YES : Return to Step 1.
NO : The procedure is complete.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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