Mitsubishi 380. Manual — part 802
SRS AIR BAG DIAGNOSIS
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-132
STEP 4. Check the harness for open circuit between the
SRS-ECU connector D-27 (terminal No.9 and 10) and the
side-airbag module (LH) connector D-24 (terminal No.1 and
2).
(1) Disconnect SRS-ECU connector D-27.
(2) Disconnect side-airbag module (LH) connector D-24.
CAUTION
Do not insert a test probe into the terminal from its front
side directly, as the connector contact pressure may be
weakened.
(3) Check for continuity between the following terminals. It
should be less than 2 ohms.
• SRS-ECU connector D-27 (terminal No.9) and the
side-airbag module (LH) connector D-24 (terminal No.1)
• SRS-ECU connector D-27 (terminal No.10) and the
side-airbag module (LH) connector D-24 (terminal No.2)
Q: Does continuity exist?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1431 sets,
replace the SRS-ECU (Refer to
). Then go
to Step 5.
NO : Replace the harness wires between SRS-ECU
connector D-27 and side-airbag module (LH)
connector D-24. Then go to Step 5.
24DB064A
CONNECTOR: D-27
SRS-ECU
D-27 (Y)
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
D-27 Floor
harness
connector
(rear view)
AC307778
CONNECTOR : D-24
AC
D-24 (R)
2
1
HARNESS SIDE
CONNECTOR
(REAR VIEW)
24DB076A
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
1 2
D-27 FLOOR
HARNESS SIDE
CONNECTOR
(REAR VIEW)
D-24
HARNESS SIDE
CONNECTOR
(REAR VIEW)
SRS AIR BAG DIAGNOSIS
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-133
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 B1431 set?
YES : Return to Step 1.
NO : The procedure is complete.
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SRS AIR BAG DIAGNOSIS
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-134
DTC B1432: Side-Airbag Module (LH) (Squib) System Fault Power Supply Circuit (Short-Circuited to
Power Supply)
CAUTION
If DTC B1432 is set in the combination meter,
always diagnose the CAN bus lines.
.
CIRCUIT OPERATION
• The SRS-ECU judges how severe a collision is
by detecting signals from the left and right side
impact sensors. If the impact is over a predeter-
mined level, the SRS-ECU sends an ignition sig-
nal. At this time, if the side-airbag safing
G-sensor is on, the SRS side-airbag will inflate.
• The ignition signal is input to the side-airbag
module to inflate the side-airbag.
.
DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the side-airbag mod-
ule (LH) (squib).
.
TROUBLESHOOTING HINTS
• Damaged wiring harnesses or connectors
• Short to the power supply in the side-airbag mod-
ule (LH) (squib) harness
• Malfunction of the 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)
• MB991865: Dummy resistor
• MB991866: Resistor harness
24DB064A
CONNECTOR: D-27
SRS-ECU
D-27 (Y)
A
B
18
10
15
7
13
5
14
6
16
8
17
9
19
11
20
12
1 2
3 4
D-27 Floor
harness
connector
(rear view)
AC307778
CONNECTOR : D-24
AB
D-24 (R)
SRS AIR BAG DIAGNOSIS
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-135
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 "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result satisfactory?
YES : Go to Step 2
NO : Repair the CAN bus lines (Refer to GROUP 54C,
Diagnosis-Can Bus Diagnostic Chart ).
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 ).
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
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