Mitsubishi Outlander (2003+). Manual — part 390
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-159
SYMPTOM PROCEDURES
INSPECTION PROCEDURE 1: Communication with MUT-II/III is not possible. (Communication is not
possible with SRS).
POWER SOURCE
CIRCUIT
BACK-UP
CAPACITOR
D.C.-D.C.
CONVERTER
IGNITION
SWITCH (IG1)
SRS-ECU
MICROCOMPUTER
CONNECTOR
LOCK
SWITCH
WARNING LAMP
DRIVE CIRCUIT
NOTE
CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF
DIAGNOSIS
CONNECTOR
MUT-II INTERFACE
CIRCUIT
FRONT SIDE
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet
SRS-ECU Power Supply Circuit
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-160
OPERATION
•
The SRS-ECU is powered from the ignition
switch (IG1).
•
The SRS-ECU power is supplied from two
circuits. Even if one circuit is shut off, the air bag
can inflate.
•
The SRS system diagnosis can be done by
connecting MUT-II/III to the diagnosis connector.
COMMENTS ON TROUBLE SYMPTOM
If communication is not possible with the SRS only,
the cause is probably an open circuit in the on-board
diagnostic output circuit of the SRS or in the power
circuit (including earth circuit).
PROBABLE CAUSES
•
Damaged wiring harnesses or connectors
•
Malfunction of the SRS-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check that the MUT-II/III can
communicate with the other systems.
Q: Can the MUT-II/III communicate with the other
systems?
YES :
Go to Step 2.
NO :
Refer to GROUP 13A
−
Troubleshooting
STEP 2. Measure the resistance between
SRS-ECU connector C-115 (terminal No.20) and
diagnosis connector C-24 (terminal No.7)
(1) Disconnect SRS-ECU connector C-115 and
diagnosis connector C-24, and measure at the
wiring harness side.
CAUTION
Do not insert a test probe into the terminal from
of the SRS-ECU connector C-115 its front side
directly as the connector contact pressure may
be weakened.
(2) Measure the resistance between the following
terminals.
•
SRS-ECU connector C-115 (terminal No.20)
and diagnosis connector C-24 (terminal No.7)
OK: Less than 2
Ω
Q: Is the check results normal?
YES :
Go to Step 3.
NO :
Go to Step 5.
AC301661AC
Harness side
connector
(front view)
Connector: C-115
SRS-ECU
C-115 (Y)
Center lower
panel
1110 9
1
2
3
1413
12
4
5
6
16
8
15
7
17
18
19
20
AC208056
CONNECTOR: C-24
AF
C-24 (B)
Center lower panel
1 2 3 4 5 6 7 8
9 10 11121314 15 16
Harness side
connector
(front view)
131415 1617 1819 20
5 6 7 8 9 10 1112
1 2
3 4
1 2 3 4 5 6 7 8
9 10 11121314 15 16
AC201667AI
C-24 Connector
(front view)
C-115 Harness side
connector (rear view)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-161
STEP 3. Check the earth circuit to the SRS-ECU.
(1) Disconnect SRS-ECU connector C-115, and
measure at the wiring harness side.
CAUTION
Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(2) Check for continuity between terminal 7 and body
earth.
OK: Less than 2
Ω
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Go to Step 6.
STEP 4. Check the power supply circuit to the
SRS-ECU.
(1) Disconnect SRS-ECU connector C-115, and
measure at the wiring harness side.
(2) Connect the negative battery terminal.
(3) Turn the ignition switch to the "ON" position.
CAUTION
Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(4) Measure the voltage between terminals 13, 16
and body earth.
OK: 9 V or more
Q: Is the check result normal?
YES :
Recheck the trouble symptom. If it is not
solved, replace the SRS-ECU (Refer to
NO :
Go to Step 7.
AC301661
Connector: C-115
AB
SRS-ECU
C-115 (Y)
Center lower
panel
13 14 15 16 17 18 19 20
5 6 7 8 9 10 11 12
1 2
3 4
AC301059AB
C-115 Harness side
connector (rear view)
AC301661
Connector: C-115
AB
SRS-ECU
C-115 (Y)
Center lower
panel
13 14 15 16 17 18 19 20
5 6 7 8 9 10 11 12
1 2
3 4
AC301060 AB
C-115 Harness side
connector (rear view)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-162
STEP 5. Connector check: SRS-ECU connector
C-115, diagnosis connector C-24 and joint
connector (3) C-02
Q: Is the check result normal?
YES :
Check the harness wires for open or short
circuit between SRS-ECU connector C-115
(terminal No.20) and diagnosis connector
C-24 (terminal No.7), and repair if
necessary. Then go to Step 8.
NO :
Repair or replace it. Then go to Step 8.
STEP 6. Connector check: SRS-ECU connector
C-115 and earth
Q: Is the check result normal?
YES :
Check the harness wire for open circuit
between SRS-ECU connector C-115
(terminal No.7) and earth, and repair if
necessary. Then go to Step 8.
NO :
Repair or replace it. Then go to Step 8.
AC301661AC
Harness side
connector
(front view)
Connector: C-115
SRS-ECU
C-115 (Y)
Center lower
panel
1110 9
1
2
3
1413
12
4
5
6
16
8
15
7
17
18
19
20
AC208056
CONNECTOR: C-24
AF
C-24 (B)
Center lower panel
1 2 3 4 5 6 7 8
9 10 11121314 15 16
Harness side
connector
(front view)
AC301395AS
33
22
11
28
17
16
15
14
13
12
25
2324
2627
3
1 2
4 5
21
20
19
18
2930
32
31
7
6
8
10
9
Connector: C-02 <LHD>
AC308769
AD
33
22
11
28
17
16
15
14
13
12
25
2324
2627
3
1 2
4 5
21
20
19
18
2930
32
31
7
6
8
10
9
Connector: C-02 <RHD>
AC301661AC
Harness side
connector
(front view)
Connector: C-115
SRS-ECU
C-115 (Y)
Center lower
panel
1110 9
1
2
3
1413
12
4
5
6
16
8
15
7
17
18
19
20
AC208080AG
Blower
assembly
<LHD>
AC208081
AC
<RHD>
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