Mitsubishi Montero (2004+). Manual — part 1186
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-79
.
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
These DTC are set if there is abnormal resistance
between the input terminals of the passenger's seat
belt pre-tensioner (squib).
.
TROUBLESHOOTING HITS
• Open circuit in the passenger's seat belt preten-
sioner (squib) circuit
• Improper connector contact
• 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-80
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 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 29 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-81
STEP 2. Check the harness for open circuit between
SRS-ECU connector E-07 (terminal No.27 and 28) and the
passenger's seat belt pretensioner F-29 (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 passenger's
seat belt pretensioner connector F-29, and measure at the
wiring harness.
(2) Check for continuity between the following terminals.
• Between connector E-07 terminal 28 and connector
F-29 terminal 2
• Between connector E-07 terminal 27 and connector
F-29 terminal 1
(3) It should be less than 2 ohms.
Q: Does continuity exist?
YES : Erase the diagnosis trouble code memory, and check
the diagnostic trouble code. If DTC 29 sets, replace
the SRS-ECU (Refer to
). Then go to Step
NO : Repair the harness wires between SRS-ECU
connector E-07 passenger’s seat belt pre-tensioner
connector F-29. Then go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Q: Is DTC 29 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)
AC204127
AD
CONNECTOR: F-29
F-29 (R)
CENTER
PILLAR
1 2
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC100327
34 35 36 37 38 39 40 41 42
25 26 27 28 29 30 31 32 33
21 22
23 24
1 2
AF
E-07 HARNESS SIDE
CONNECTOR
(REAR VIEW)
F-29 HARNESS SIDE
CONNECTOR (REAR VIEW)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-82
DTC 34: Connector Lock System Detects Connector Unlocked
.
DTC SET CONDITIONS
This DTC is set if a poor connection at the SRS-ECU
is detected. However, if the vehicle condition returns
to normal, DTC number 34 will be automatically
erased, and the SRS warning light will go out.
.
TROUBLESHOOTING HINTS
• Damaged connectors
• Malfunction of the SRS-ECU
.
DIAGNOSIS
Required Special Tool:
• 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)
STEP 1. Check the SRS-ECU connector E-07, E-08.
Q: Are connectors correctly engaged?
YES : Go to Step 2.
NO : Engage the connectors correctly. Then go to Step 3.
AC309378
34 35 36 37 38 39 40 41 42
25 26 27 28 29 30 31 32 33
21 22
23 24
E-08
HARNESS SIDE
CONNECTOR
(REAR VIEW)
E-07
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AB
CONNECTORS: E-07, E-08
E-07 (Y), E-08(Y)
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