Mitsubishi Montero (2004+). Manual — part 1176
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-39
.
TROUBLESHOOTING HINTS
Malfunction of the SRS-ECU.
.
DIAGNOSIS
Replace the SRS-ECU (Refer to
31
Capacitor
• Voltage at the capacitor terminal is higher than the
specified value for five seconds or more
32
• Voltage at the capacitor terminal is lower than the
specified value for five seconds or more (This is not
detected if DTC No.41 or 42 indicating battery positive
voltage drop has been output).
45
Non-volatile memory (EEPROM)
and A/D converter
• When the non-volatile memory (EEPROM) and A/D
converter system are abnormal
51
Driver's air bag module (squib
ignition drive circuit)
• Short circuit in the squib ignition drive circuit
52
• Open circuit in the squib ignition drive circuit
54
Front passenger's air bag module
(squib ignition drive circuit)
• Short circuit in the squib ignition drive circuit
55
• Open circuit in the squib ignition drive circuit
56
Driver’s seat belt pre-tensioner
(squib ignition drive circuit)
• Short circuit in the squib ignition drive circuit
57
• Open circuit in the squib ignition drive circuit
58
Passenger’s seat belt
pre-tensioner (squib ignition drive
circuit)
• Short circuit in the squib ignition drive circuit
59
• Open circuit in the squib ignition drive circuit
73
Side-airbag module (RH) (squib
ignition drive circuit)
• Short circuit in the squib ignition drive circuit
74
• Open circuit in the squib ignition drive circuit
83
Side-airbag module (LH) (squib
ignition drive circuit)
• Short circuit in the squib ignition drive circuit
84
• Open circuit in the squib ignition drive circuit
CODE NO. DEFECTIVE PART
SYMPTOMS
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-40
DTC 21: Driver’s Air Bag Module (Squib) System Fault 1 (Short Circuit between Terminals of the Squib
Circuit)
.
AIR BAG MODULE
(SQUIB)
(DRIVER'S SIDE)
CLOCK
SPRING
MICROCOMPUTER
AIR BAG DRIVE CIRCUIT
SRS-ECU
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
CONNECTOR
LOCK SWITCH
NOTE
: CONNECTOR
COUPLED: ON
CONNECTOR
UNCOUPLED: OFF
Driver's Air Bag Module (Squib) Circuit
AC204226AD
CLOCK SPRING
D-206 (Y)
CONNECTORS: D-206, D-229
D-229
ACX01478 AG
CONNECTOR: E-08
E-08 (Y)
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-41
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 SRS
air bag will inflate.
• The ignition signal is input to the air bag module
via the clock spring to inflate the air bag.
.
DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the driver's side air
bag module (squib). The most likely causes for
this code to be set the followings:
• Short circuit in driver’s air bag module (squib)
or harness
• Short circuit in the clock spring
However, if no DTC resets, the SRS warning light will
be switched off (DTC will be retained).
.
TROUBLESHOOTING HINTS
• Improper engaged connector or defective short
spring*
• Short circuit in the clock spring
• Short circuit between the driver's air bag module
(squib) circuit terminals
• Damaged connector(s)
• Malfunction of the SRS-ECU
.
NOTE: *: The squib circuit connectors integrate a
"short" spring (which prevents the air bag from
deploying unintentionally due to static electricity by
shorting the positive wire to the ground wire in the
squib circuit when the connectors are disconnected)
(Refer to
). Therefore, if connector E-08,
D-206 or D-229 is damaged or improperly engaged,
the short spring may not be released when the con-
nector is connected.
.
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
SRS AIR BAG DIAGNOSIS
TSB Revision
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-42
STEP 1. Using scan tool MB991958, read the diagnostic
trouble code.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOOK (OFF)" position.
Q: Is DTC 34 set?
YES : Go to Step 2.
NO : Go to Step 3.
STEP 2. Check SRS-ECU connector E-08.
Q: Is the connector correctly engaged?
YES : Go to Step 3.
NO : Engage the connector correctly. Then go to Step 8.
AC307591 AB
MB991911
DATA LINK
CONNECTOR
MB991824
MB991827
ACX01478AM
CONNECTOR: E-08
E-08 (Y)
HARNESS SIDE
CONNECTOR
(REAR VIEW)
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