Mitsubishi Montero (2004+). Manual — part 1183
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-67
DTC 27: Driver’s Seat Belt Pre-Tensioner (Squib) System Fault 2 (Open in the Squib Circuit)
SEAT BELT
PRETENSIONER
(LH)
MICROCOMPUTER
AIR BAG DRIVE CIRCUIT
SRS-ECU
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
NOTE
: CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF
Driver's Seat Belt Pre-Tensioner (Squib)
ACX01478AI
CONNECTOR: E-07
E-07 (Y)
AC204603AB
CONNECTOR: E-19
FLOOR
CONSOLE
E-19
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-68
.
CIRCUIT OPERATION
The SRS-ECU judges how severe a collision is by
detecting signals from the front impact sensors and
the front air bag analog G-sensor. If the impact is
over a predetermined level, the SRS-ECU outputs an
ignition signal. At this time, if the front air bag safing
G-sensor is on, the pre-tensioner will deploy.
.
DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the driver's seat belt
pre-tensioner (squib).
.
TROUBLESHOOTING HITS
• Improper connector contact
• Open circuit in the driver's seat belt pretensioner
(squib) circuit
• Malfunction of the SRS-ECU
.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B (Vehicles without
CAN communication system)
• MB991865: Dummy resister
• MB991866: Resister harness
AC204126
AB
CONNECTOR: F-27
F-27 (R)
CENTER
PILLAR
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-69
STEP 1. Check the driver's seat belt pre-tensioner. (Using
scan tool MB991958, read the diagnostic trouble code).
(1) Disconnect the negative battery terminal.
(2) Disconnect the driver's seat belt pretensioner connector
F-27.
(3) Connect special tool MB991865 to special tool MB991866.
CAUTION
Do not insert a test probe into the terminal from its front
side directly as the connector contact pressure may be
weakened.
(4) Insert special tool MB991866 into the harness connector by
backprobing.
(5) Connect the negative battery terminal.
(6) Erase diagnostic trouble code memory, and then check the
diagnostic trouble code.
Q: Is DTC 27 set?
YES : Go to Step 2.
NO : Replace the driver's seat belt pre-tensioner (Refer to
AC204126
AD
CONNECTOR: F-27
F-27 (R)
CENTER
PILLAR
1 2
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC006042 AY
MB991866
(RESISTOR HARNESS)
F-27 HARNESS
CONNECTOR
MB991865 (DUMMY
RESISTOR: 3
Ω)
F-27 SEAT BELT
PRE-TENSIONER
CONNECTOR (DRIVER'S SIDE)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-70
STEP 2. Check the harness for open circuit between
SRS-ECU connector E-07 (terminal No.29 and 30) and the
driver's seat belt pretensioner F-27 (terminal No.1 and 2).
CAUTION
Do not insert a test probe into the terminal from its front
side directly as the connector contact pressure may be
weakened.
(1) Disconnect SRS-ECU connector E-07 and driver's seat belt
pretensioner connector F-27, and measure at the wiring
harness.
(2) Check for continuity between the following terminals.
• Between connector E-07 terminal 30 and connector
F-27 terminal 1
• Between connector E-07 terminal 29 and connector
F-27 terminal 2
(3) It should be less than 2 ohms.
Q: Does continuity exist?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code sets. If DTC 27 sets,
replace the SRS-ECU (Refer to
). Then go
to Step 3.
NO : Repair harness wires between SRS-ECU connector
E-07 and driver’s seat belt pre-tensioner connector
F-27. Then go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Q: Is DTC 27 set?
YES : Return to Step 1.
NO : The procedure is complete. (If no malfunctions are not
found in all steps, an intermittent malfunction is
suspected. Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunction
).
ACX01478AJ
CONNECTOR: E-07
E-07 (Y)
34 35 36 37 38 39 40 41 42
25 26 27 28 29 30 31 32 33
21 22
23 24
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC204126
AD
CONNECTOR: F-27
F-27 (R)
CENTER
PILLAR
1 2
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC006245
34 35 36 37 38 39 40 41 42
25 26 27 28 29 30 31 32 33
21 22
23 24
1 2
E-07 HARNESS SIDE
CONNECTOR
(REAR VIEW)
F-27 HARNESS SIDE
CONNECTOR (REAR VIEW)
AG
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