Mitsubishi Outlander GS45X. Manual — part 1412
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-143
DTC B1B22: Curtain Air Bag Module (RH) (Squib) System (Squib Circuit Open)
CAUTION
If DTC B1B22 is set in the SRS-ECU, always diag-
nose the CAN main bus line.
.
CIRCUIT OPERATION
• The SRS-ECU judges how severe a collision is
by detecting signals from the side impact sensors
installed on the lower side of the center pillar and
at the quarter panel inner. If the impact is over a
predetermined level, the SRS-ECU sends an
ignition signal. At this time, if the side collision
safing G-sensor is on, the SRS air bag will inflate.
• The ignition signal is input to the curtain air bag
module (RH) to inflate the curtain air bag.
AC709517
CURTAIN AIR BAG
MODULE
(SQUIB) (RH)
: CONNECTOR LOCK SWITCH
CONNECTOR COUPLED: ON
CONNECTOR UNCOUPLED: OFF
NOTE
SRS-ECU
Curtain Air Bag Module (Squib) (RH) Circuit
AB
AC901076
C-27 (Y)
AC
Connector: C-27
AC901080AC
Connectors: D-08, D-104
D-104 (B)
D-08 (Y)
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-144
.
DTC SET CONDITIONS
This DTC is set if there is abnormal resistance
between the input terminals of the curtain air bag
module (RH) (squib).
.
TROUBLESHOOTING HITS
• Open circuit in the curtain air bag module (RH)
(squib) circuit
• Improper connector contact
• Malfunction of the SRS-ECU
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A (Vehicles with
CAN Communication System)
• MB991865: Dummy resistor
• MB991866: Resister harness
• MB991884: Resister harness
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
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) Connect scan tool MB991958. Refer to "How to connect the
."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 2.
NO : Repair the CAN bus line (Refer to GROUP 54C,
).
ZC501967
AC404789
AC701411AB
MB991824
MB991827
MB991910
Data link
connector
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-145
STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) Check if the DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Go to Step 3.
NO : There is an intermittent malfunction such as poor
engaged connector(s) or open circuit (Refer to
GROUP 00, How to Use Troubleshooting/Inspection
Service Points
− How to Cope with Intermittent
Malfunctions
).
STEP 3. Check by dummy resistor connection. (Using scan
tool MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect the D-08 intermediate connector, unlock the
connector by sliding the locking button to the direction of the
arrow as shown in the figure, and then disconnect the
connector.
(3) Connect special tool MB991865 to special tool MB991866.
CAUTION
Do not insert a probe into the terminal from its front side
directly, as the connector contact pressure may be weak-
ened.
(4) Insert the probe of resistor harness, to which the dummy
resistor is installed, from the back of D-08 intermediate
connector (floor harness side).
(5) Connect the negative battery terminal.
(6) After erasing the diagnostic trouble code memory, check the
diagnostic trouble code again.
(7) Disconnect the negative battery terminal.
Q: Is DTC B1B22 set?
YES : Go to Step 4.
NO : Go to Step 5.
ZC501967
AC404789
AC701411AB
MB991824
MB991827
MB991910
Data link
connector
AC706606
AH
Locking button
Intermediate
connector
AC507310AB
D-08 Intermediate connector
(Curtain air bag harness side)
D-08
Intermediate
connector
(Floor harness side)
MB991865
(Dummy resistor: 3 )
MB991866
(Resistor harness)
SRS AIR BAG DIAGNOSIS
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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-146
STEP 4. Resistance measurement at the C-27 SRS-ECU
connector and the D-08 intermediate connector.
(1) Disconnect the negative battery terminal.
(2) While pushing the part "A" indicated in the figure of the
harness side connector, turn the lock lever to the direction
of the arrow to release the lock lever, and disconnect the
C-27 SRS-ECU connector.
DANGER
To prevent the air bag from deploying unintentionally,
disconnect the intermediate connector D-08 to short
the squib circuit.
(3) Disconnect the D-08 intermediate connector, unlock the
connector by sliding the locking button to the direction of the
arrow as shown in the figure, and then disconnect the
connector.
CAUTION
The short spring may not be released due to the insuffi-
cient insertion. Therefore, insert the insulator for 4 mm (0.6
inch) or more.
(4) Insert a cable tie [3 mm (0.12 inch) wide, 0.5 mm (0.02 inch)
thick] between terminal 39, 40 and the short spring to
release the short spring.
AC506734
A
AB
Lock lever
AC706606
AH
Locking button
Intermediate
connector
AC507303BO
A
A
C-27 Harness side
connector (front view)
Section
A - A
Cable tie
Short spring
4 mm or more
Terminal
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