Mitsubishi Outlander XL. Manual — part 921
TROUBLESHOOTING HITS
⦆
Damaged wiring harnesses or connectors
⦆
Short to the ground in the driver's seat belt pre-
tensioner (squib) harness
⦆
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
⦆
MB991884: Resister harness
STEP 1. Using scan tool MB991958, diagnose the CAN bus
line.
ZC501967
AC404789
ZC5019680000
MB991824
MB991827
MB991910
Data link
connector
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991958.
(1)
Connect scan tool MB991958. Refer to "How to connect the
scan tool P.52B-31."
(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 54D,
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-215
SRS AIR BAG DIAGNOSIS
STEP 2. Recheck for diagnostic trouble code.
ZC501967
AC404789
ZC5019680000
MB991824
MB991827
MB991910
Data link
connector
Check again if the DTC is set.
(1)
Erase the DTC.
(2)
Turn the ignition switch to the "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 Cope with Intermittent Malfunction P.00-15).
STEP 3. Check the driver's seat belt pre-tensioner. (Using
scan tool MB991958, read the diagnostic trouble code.)
(1)
Disconnect the negative battery terminal.
ZC6018230001
Seat belt
pre-tensioner
Floor wiring harness side
connector (2-pin, black)
Locking
button
Flat-tipped
screwdriver
(2)
Disconnect driver's seat belt pre-tensioner connector D-121.
Use a flat-tipped screwdriver to unlock the locking button at
the harness side connector by withdrawing it toward you in
two stages, and then disconnect the connector.
ZC600214
Harness side
connector
MB991865
(Dummy resistor: 3
)
MB991884
(Resistor harness)
0000
(3)
Connect special tool MB991865 to special tool MB991884.
(4)
Connect special tool MB991884 to the D-121 harness side
connector.
(5)
Connect the negative battery terminal.
(6)
Erase diagnostic trouble code memory, and check the
diagnostic trouble code.
Q:Is DTC B1C38 set?
YES:
Go to Step 4.
NO:
Replace the driver's seat belt with pre-tensioner.
Refer to P.52B-345. Then go to Step 6.
STEP 4. Check the driver's seat belt pre-tensioner circuit.
Measure the resistance at the SRS-ECU connector C-27.
(1)
Disconnect SRS-ECU connector C-27.
52B-216
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
SRS AIR BAG DIAGNOSIS
ZC6018230001
Seat belt
pre-tensioner
Floor wiring harness side
connector (2-pin, black)
Locking
button
Flat-tipped
screwdriver
(2)
Disconnect driver's seat belt pre-tensioner connector D-121.
Use a flat-tipped screwdriver to unlock the locking button at
the harness side connector by withdrawing it toward you in
two stages, and then disconnect the connector.
ZC5007880042
C-27 Harness side
connector (front view)
Do not insert a test probe into the terminal from its front side
directly, as the connector contact pressure may be
weakened.
(3)
Check for continuity between C-27 harness side connector
terminals 45, 46 and body ground.
It should be an open circuit.
Q:Does continuity exist?
YES:
Go to Step 5.
NO:
Erase the diagnostic trouble code memory, and check
the diagnostic trouble code. If DTC B1C38 sets, replace
the SRS-ECU (Refer to P.52B-326). Then go to Step 6.
STEP 5. Check harness wires for short circuit to ground
between SRS-ECU connector C-27 (terminal No.45 and 46)
and driver's seat belt pre-tensioner connector D-121
(terminal No.1 and 2).
Q:Are the harness wires between SRS-ECU connector C-27
(terminal No.45 and 46) and driver's seat belt pre-
tensioner connector D-121 (terminal No.1 and 2) in good
condition?
YES:
Go to Step 6.
NO:
Replace the harness wires between SRS-ECU connector
C-27 and driver's seat belt pre-tensioner connector
D-121. Then go to Step 6.
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
52B-217
SRS AIR BAG DIAGNOSIS
STEP 6. Recheck for diagnostic trouble code.
ZC501967
AC404789
ZC5019680000
MB991824
MB991827
MB991910
Data link
connector
Check again if the DTC is set.
(1)
Erase the DTC.
(2)
Turn the ignition switch to the "ON" position.
(3)
Check if the DTC is set.
(4)
Turn the ignition switch to the "LOCK" (OFF) position.
Q:Is DTC B1C38 set?
YES:
Return to Step 1.
NO:
The procedure is complete.
52B-218
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
SRS AIR BAG DIAGNOSIS
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