Mitsubishi Outlander XL. Manual - part 929

STEP 5. 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 B1C49 set?

YES:

 Return to Step 1.

NO:

 The procedure is complete.

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-247

SRS AIR BAG DIAGNOSIS

DTC B1C4A: Front Passenger's Pre-tensioner (Squib) System (Short Circuit Between
Squib Circuit Terminals)

M15204000940USA0000010000

SEAT BELT
PRE-TENSIONER
(RH)

CONNECTOR
LOCK SWITCH

CONNECTOR
LOCK SWITCH

Seat Belt Pre-Tensioner (RH) (Squib) Circuit

SRS-ECU

: CONNECTOR COUPLED : ON
  CONNECTOR UNCOUPLED : OFF

NOTE

ZC600876

Connector: C-27

C-27 (Y)

0025

ZC600879

Connector: D-130

D-130 (B)

0013

 

If  DTC  B1C4A  is  set  in  the  SRS-ECU,  always
diagnose the CAN main bus line.

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  sends  an
ignition signal. At this time, if the front air bag safing
G-sensor is on, the pre-tensioner will deploy.

52B-248

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

SRS AIR BAG DIAGNOSIS

DTC SET CONDITIONS
This  DTC  is  set  if  there  is  abnormal  resistance
between the input terminals of the passenger’s seat
belt pre-tensioner (squib).

TROUBLESHOOTING HITS

｠

Improper  engaged  connector  or  defective  short
spring*

｠

Short circuit between the passenger's seat belt pre-
tensioner (squib) circuit terminals

｠

Damaged connector(s)

｠

Malfunction of the SRS-ECU

NOTE: 

*: The squib circuit connectors integrate a

"short" spring (which prevents the seat belt pre-
tensioner 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 P.52B-5).
Therefore, if connector C-27 or D-130 is damaged
or improperly engaged, the short spring may not be
released when the connector is connected.

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-249

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 "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 SRS-ECU connector C-27 and passenger’s
seat belt pre-tensioner connector D-130. (Using scan tool
MB991958, read the diagnostic trouble code.)

(1)

Disconnect the negative battery terminal.

ZC6018230000

Seat belt  
pre-tensioner

Floor wiring harness side
connector (2-pin, black)

Locking  
button

Flat-tipped
screwdriver

(2)

Disconnect connectors C-27 and D-130, and then reconnect
them. For connector D-130, 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.

(3)

Connector the negative battery terminal.

(4)

Erase the diagnostic trouble code memory, and check the
diagnostic trouble code.

Q:Is DTC B1C4A set?

YES:

 Go to Step 4.

NO:

 The procedure is complete. It is assumed that DTC

B1C4A set because connector C-27 or D-130 was engaged
improperly.

STEP 4. Check the passenger's seat belt pre-tensioner.
(Using scan tool MB991958, read the diagnostic trouble
code.)

(1)

Disconnect the negative battery terminal.

52B-250

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

SRS AIR BAG DIAGNOSIS