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,

Diagnosis P.54D-17).

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