Mitsubishi Colt Ralliart. Manual — part 557
![](/vehicles/winoney/ama/flend/xtue.png)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-66
CAUTION
Insert an insulator such as a cable tie to a depth
of 4 mm or more, otherwise the short spring will
not be released.
(4) Insert a cable tie [3 mm wide, 0.5 mm thick]
between terminals 5, 6 and the short spring to
release the short spring.
CAUTION
Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(5) Resistance measurement between B-35 harness
side connector terminals 5 and 6.
OK: Open circuit.
Q: Is the check result normal?
YES : .
Go to Step 6.
NO : .
Repair the harness wires between
SRS-ECU connector B-35 (terminal No.5
and 6) and passenger’s (front) seat belt
pre-tensioner connector C-20 (terminal No.1
and 2).
STEP 6. Check whether the diagnosis code is
reset.
Q: Is diagnosis code 28 set?
YES :
Replace the SRS-ECU (Refer to
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction
).
AC208510
Section
A - A
B-35
Harness side connector
(front view)
Cable tie
Short spring
Terminal
AE
4 mm or more
A
A
13 14
16 17
19 20
5 6 7 8 9 10 11 12
1 2
3 4
18
15
AC208507
B-35Harness side connector
(rear view)
AE
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/ugm.png)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-67
Code No.29: Passenger's (front) seat belt pre-tensioner (squib) system (open-circuited in the squib
circuit)
OPERATION
The SRS-ECU judges how severe a collision is by
detecting signals from the front impact sensors and
the front air bag analogue G-sensor. If the impact is
over a predetermined level, the SRS-ECU sends an
ignition signal. At this time, if the front air bag safing
G-sensor is on, the pre-tensioner will deploy.
DIAGNOSIS CODE SET CONDITIONS
This diagnosis code is set if the passenger's (front)
seat belt pre-tensioner squib wire(s) are
open-circuited. However, if no diagnosis code resets,
the SRS warning lamp will be switched off (diagnosis
code will be retained).
PROBABLE CAUSES
• Open circuit in the passenger's (front) seat belt
pre-tensioner (squib) circuit
• Improper connector contact
• Malfunction of the SRS-ECU
AC510233
Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Grey R : Red P : Pink V : Violet
SEAT BELT
PRETENSIONER
(LH)
SRS-ECU
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
NOTE
: CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF
Passenger's (Front) Seat Belt Pre-tensioner (Squib)
AB
Main
Index
Group
TOC
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-68
DIAGNOSIS PROCEDURE
STEP 1. Check the diagnosis code by connecting
a dummy resistor. (M.U.T.-III diagnosis code)
(1) Disconnect the negative battery terminal.
(2) Disconnect passenger's (front) seat belt
pre-tensioner connector C-20. Use a flat-tipped
screwdriver to pull out the locking button at the
harness side connector, and then disconnect the
connector.
(3) Connect special tool dummy resistor (MB991865)
to special tool resistor harness (MB991884).
(4) Connect special tool (MB991884) to the C-20
harness side connector.
(5) Connect the negative battery terminal.
(6) Erase diagnosis code memory, and then check
the diagnosis code.
Q: Is diagnosis code 29 set?
YES : .
Go to Step 2.
NO : .
Replace the passenger's (front) seat belt
with pre-tensioner (Refer to
STEP 2. Resistance measurement between
SRS-ECU connector B-35 (terminal No.5 and 6)
and the passenger's (front) seat belt
pre-tensioner connector C-20 (terminal No.1 and
2)
(1) Disconnect the negative battery terminal.
(2) Disconnect SRS-ECU connector B-35 and
passenger's (front) seat belt pre-tensioner
connector C-20. For connector C-20, use a
flat-tipped screwdriver to pull out the locking
button at the harness side connector, and then
disconnect the connector.
AC207223 AE
Harness side
connector
(front view)
Connector: C-20
C-20 (B)
Centre
pillar
AC208430AE
Pre-tensioner
connector
Locking
button
Harness side
connector
Flat-tipped
screwdriver
MB991865
(Dummy resistor : 3
Ω)
C-20 Harness side
connectors
MB991884
(Resistor
harness)
AG
AC206285
AF
B-35 (Y)
Connector: B-35
Harness side
connector
(rear view)
AC207223 AE
Harness side
connector
(front view)
Connector: C-20
C-20 (B)
Centre
pillar
AC208430AE
Pre-tensioner
connector
Locking
button
Harness side
connector
Flat-tipped
screwdriver
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/weag.png)
TROUBLESHOOTING
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-69
(3) Connect C-20 harness side connector to special
tool resistor harness (MB991884).
CAUTION
Do not insert a test probe into the terminal from
its front side directly as the connector contact
pressure may be weakened.
(4) Resistance measurement between the following
terminals.
• SRS-ECU connector B-35 terminal No.5 and
the special tool terminal No.2
• SRS-ECU connector B-35 terminal No.6 and
the special tool terminal No.1
OK: Continuity (Less than 2
Ω)
Q: Are the check results normal?
YES : .
Go to Step 3.
NO : .
Repair the harness wires between
SRS-ECU connector B-35 (terminal No.5
and 6) passenger’s (front) seat belt
pre-tensioner connector C-20 (terminal No.1
and 2).
STEP 3.Check whether the diagnosis code is
reset.
Q: Is diagnosis code 29 set?
YES :
Replace the SRS-ECU (Refer to
).
NO :
An intermittent malfunction is suspected
(Refer to GROUP 00, How to Cope with
Intermittent Malfunction
).
AC201287BQ
C-20
Harness side
connector
MB991884
13 14
16 17
19 20
5 6 7 8 9 10 11 12
1 2
3 4
18
15
2
1
AC208506AD
Resister harness
connector
B-35
Harness side
connector (rear view)
Main
Index
Group
TOC
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