Mitsubishi Montero (2004+). Manual — part 1201
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-139
DTC 68: Passenger's Seat Belt Pre-Tensioner (Squib) System Fault for Power Supply Circuit
(Short-Circuited to Power Supply)
SEAT BELT
PRETENSIONER
(RH)
MICROCOMPUTER
AIR BAG DRIVE CIRCUIT
SRS-ECU
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
NOTE
: CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF
Passenger's (Front) Seat Belt Pre-tensioner (Squib)
ACX01478AI
CONNECTOR: E-07
E-07 (Y)
AC204603AD
CONNECTOR: E-16
FLOOR
CONSOLE
E-16
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-140
.
CIRCUIT OPERATION
The side impact sensor includes an analog G sensor
and CPU, etc. The CPU monitors the analog G sen-
sor output signal. If the CPU judges that the side-air-
bags should be deployed, it sends a fire signal to the
SRS-ECU to deploy the side-airbags. Besides that,
the CPU diagnoses the internal components of the
side impact sensor. If a malfunction occurs, it
requests the SRS-ECU to set a diagnostic trouble
code.
.
DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the passenger's seat
belt pre-tensioner (squib).
.
TROUBLESHOOTING HITS
• Damaged wiring harnesses or connectors
• Short to the power supply in the passenger's seat
belt pretensioner (squib) harness
• 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
AC204127
AB
CONNECTOR: F-29
F-29 (R)
CENTER
PILLAR
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-141
STEP 1. Check the passenger's seat belt pre-tensioner.
(Using scan tool MB991958, read the diagnostic trouble
code).
(1) Disconnect the negative battery terminal.
(2) Disconnect the passenger's seat belt pretensioner
connector F-29.
(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 side
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 68 set?
YES : Go to Step 2.
NO : Replace the passenger's seat belt pre-tensioner
(Refer to
AC204127
AD
CONNECTOR: F-29
F-29 (R)
CENTER
PILLAR
1 2
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC006042 AZ
MB991866
(RESISTOR HARNESS)
F-29 HARNESS
CONNECTOR
MB991865 (DUMMY
RESISTOR: 3
Ω)
F-29 SEAT BELT
PRE-TENSIONER
CONNECTOR (PASSNGER'S SIDE)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-142
STEP 2. Check the passenger's seat belt pretensioner at
the SRS-ECU connector E-07.
(1) Disconnect SRS-ECU connector E-07.
(2) Disconnect passenger's seat belt pretensioner connector
F-29.
(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 E-07 harness connector
terminals 27, 28 and body ground.
Voltage should measure 0 volt.
Q: Is the circuit normal?
YES : Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC 68 sets, replace
the SRS-ECU (Refer to
). Then go to Step
NO : Go to Step 3.
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)
AC204127
AD
CONNECTOR: F-29
F-29 (R)
CENTER
PILLAR
1 2
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC100341
34 35 36 37 38 39 40 41 42
25 26 27 28 29 30 31 32 33
21 22
23 24
AQ
E-07 HARNESS SIDE
CONNECTOR (REAR VIEW)
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