Mitsubishi 380. Manual — part 821
SRS AIR BAG DIAGNOSIS
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-208
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 ).
STEP 3. Check the SRS-ECU connector D-26, C-121 and
D-27.
Q: Are connectors correctly engaged?
YES : Go to Step 4.
NO : Engage the connectors correctly. Then go to Step 5.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
24DB065A
63
55
51
69
61
66
58
65
64
5657
68
60
67
59
70
62
53
52 B A
54
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
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
SRS-ECU
D-26 Floor harness
side connector
(rear view)
D-27 Floor harness
side connector
(rear view)
D-26 (Y),
C-121 (Y),
D-27 (Y)
CONNECTORS: D-26, C-121, D-27
C-121 Instrument harness
connector (rear view)
SRS AIR BAG DIAGNOSIS
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-209
STEP 4. Check SRS-ECU connector D-26, C-121 and D-27
for damage.
(1) Disconnect SRS-ECU connectors D-26, C-121 and D-27.
(2) Check the connector lock switch terminal inside the harness
side connector for improper contact or deformation.
Q: Are the SRS-ECU connector D-26, C-121 and D-27 in
good condition?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1519 sets,
replace the SRS-ECU (Refer to
). Then go
to Step 5.
NO : Replace the SRS-ECU connector D-26, C-121 and
D-27. Refer to GROUP 00E, Harness Connector
Inspection . Then go to Step 5.
AC307924 AB
SRS-ECU HARNESS SIDE
CONNECTOR (FRONT VIEW)
CONNECTOR LOCK
SWITCH TERMINAL
24DB065A
63
55
51
69
61
66
58
65
64
5657
68
60
67
59
70
62
53
52 B A
54
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
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
SRS-ECU
D-26 Floor harness
side connector
(rear view)
D-27 Floor harness
side connector
(rear view)
D-26 (Y),
C-121 (Y),
D-27 (Y)
CONNECTORS: D-26, C-121, D-27
C-121 Instrument harness
connector (rear view)
SRS AIR BAG DIAGNOSIS
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-210
STEP 5. 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 B1519 set?
YES : Return to Step 1.
NO : The procedure is complete.
DTC B1547: Passenger’s Front Air Bag Cut Off System
CAUTION
If DTC B1547 is set in the SRS-ECU, always diag-
nose the CAN main bus line.
.
DTC SET CONDITIONS
This DTC is set if the following conditions are
detected:
• Malfunction of front passenger’s air bag module
system
• Malfunction of SRS-ECU system
.
TROUBLESHOOTING HINTS
Malfunction of SRS-ECU
• Refer to circuit diagrams GROUP-
• Refer to configuration diagrams GROUP-
.
DIAGNOSIS
Required Special Tools:
• MB991958: diagnostic tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991910: MUT-III Main Harness A (Vehicles with CAN
communication system)
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-211
STEP 1. Using diagnostic tool MB991958, diagnose the
CAN bus line.
CAUTION
To prevent damage to diagnostic tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting diagnostic tool
MB991958.
(1) Connect diagnostic tool MB991958. Refer to "How to
connect the diagnostic 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,
Diagnosis ).
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 ).
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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