Mitsubishi Montero (2004+). Manual — part 1205
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-155
DTC 72: Right Hand Side-Airbag Module (Squib) System Fault 2 (Open in the Squib Circuit)
.
CIRCUIT OPERATION
• The SRS-ECU judges how severe a collision is
by detecting signals from the left and right side
impact sensors. If the impact is over a predeter-
mined level, the SRS-ECU outputs an ignition
signal. At this time, if the side-airbag safing
G-sensor is on, the SRS side-airbag will inflate.
• The ignition signal is input to the side-airbag
module to inflate the side-airbag.
.
DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the side-airbag mod-
ule (RH) (squib).
.
TROUBLESHOOTING HINTS
• Open circuit in the side-airbag module (RH)
(squib) circuit
• Improper connector contact
• Malfunction of the SRS-ECU
MICROCOMPUTER
AIR BAG DRIVE CIRCUIT
SRS-ECU
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
SIDE AIR BAG
MODULE (SQUIB)
(RH)
NOTE
: CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF
Side-Airbag Module (RH) (Squib) Circuit
ACX01478AI
CONNECTOR: E-07
E-07 (Y)
ACX01649
X0942CA
AD
CONNECTOR: F-21
F-21 (R)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-156
.
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
STEP 1. Check the side-airbag module (RH). (Using scan
tool MB991958, read the diagnostic trouble code).
(1) Disconnect the negative battery terminal.
(2) Disconnect the side-airbag module (RH) connector F-21.
(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 the diagnostic trouble code memory, and check the
diagnostic trouble code.
Q: Is DTC 72 set?
YES : Go to Step 2.
NO : Replace the seat back assembly of the front seat
(RH) (Refer to GROUP 52A, Front Seat
).
Then go to Step 3.
ACX01649
X0942CA
AF
CONNECTOR: F-21
F-21 (R)
1 2
HARNESS SIDE
CONNECTOR
(REAR VIEW)
AC006042 AW
MB991866
(RESISTOR HARNESS)
F-21 HARNESS
CONNECTOR
F-21 SIDE-AIRBAG
MODULE (RH) CONNECTOR
MB991865 (DUMMY
RESISTOR: 3
Ω)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-157
STEP 2. Check the harness for open circuit between
SRS-ECU connector E-08 (terminal No.23 and 24) and the
side-air bag module (RH) connector F-21 (terminal No.1
and 2).
(1) Disconnect SRS-ECU connector E-07 and side-air bag
module (RH) connector F-21.
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 the following terminals.
• Between connector E-07 terminal 23 and connector
F-21 terminal 2.
• Between connector E-07 terminal 24 and connector
F-21 terminal 1.
(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. If DTC 72 sets, replace
the SRS-ECU (Refer to
). Then go to Step
NO : Repair the harness wires between SRS-ECU
connector E-07 and side-airbag module (RH)
connector F-21. Then go to Step 3.
STEP 3. Recheck for diagnostic trouble code.
Q: Is DTC 72 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)
ACX01649
X0942CA
AF
CONNECTOR: F-21
F-21 (R)
1 2
HARNESS SIDE
CONNECTOR
(REAR VIEW)
34 35 36 37 38 39 40 41 42
25 26 27 28 29 30 31 32 33
21 22
23 24
1 2
AC100382
E-07 HARNESS SIDE
CONNECTOR
(REAR VIEW)
F-21 HARNESS SIDE
CONNECTOR (REAR VIEW)
AO
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-158
DTC 75: Right Hand Side-Airbag Module (Squib) System Fault Power Supply Circuit (Short-Circuit to
Power Supply)
.
CIRCUIT OPERATION
• The SRS-ECU judges how severe a collision is
by detecting signals from the left and right side
impact sensors. If the impact is over a predeter-
mined level, the SRS-ECU outputs an ignition
signal. At this time, if the side-airbag safing
G-sensor is on, the SRS side-airbag will inflate.
• The ignition signal is input to the side-airbag
module to inflate the air bag.
.
DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the side-airbag mod-
ule (RH) (squib).
.
MICROCOMPUTER
AIR BAG DRIVE CIRCUIT
SRS-ECU
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
SIDE AIR BAG
MODULE (SQUIB)
(RH)
NOTE
: CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF
Side-Airbag Module (RH) (Squib) Circuit
ACX01478AI
CONNECTOR: E-07
E-07 (Y)
ACX01649
X0942CA
AD
CONNECTOR: F-21
F-21 (R)
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