Mitsubishi Outlander XL. Manual - part 902

ZC500788

D-28 Driver’s seat belt  
switch connector

0058

Item

Tester
connection

Specified
condition

Fastened seat belt

3 - Ground

No continuity

4 - Ground

No continuity

3 - 4

Continuity

 (Less

than 2 Ω)

Unfastened seat belt

3 - Ground

No continuity

4 - Ground

No continuity

3 - 4

No continuity

Q:Is driver’s seat belt switch in good condition?

YES:

 Go to Step 4.

NO:

 Replace inner seat belt. (Refer to GROUP 52A, Front

Seat Belt P.52A-22.)

STEP 4. Check the driver’s seat belt switch circuit D-28.
Measure the resistance at SRS-ECU connector C-27.

(1)

Disconnect driver’s seat belt switch connector D-28.

ZC603628

Buckle

Tongue

D-28 Driver’s  
seat belt switch  
connector

0001

(2)

Install the driver’s seat belt to the driver’s seat belt switch.

(3)

Disconnect SRS-ECU connector C-27 and measure at the
harness side.

ZC600210

A

Lock lever

0000

(4)

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.

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-139

SRS AIR BAG DIAGNOSIS

ZC5007880059

C-27 Harness side 
connector (front view)

(5)

Measure the resistance between terminal 56, 57 and body
ground.
It should be an open circuit

 

ZC500788

C-27 Harness side 
connector (front view)

0060

(6)

Measure the resistance between terminal 56 and terminal 57.
Resistance should be less than 2 ohms

 

ZC603628

Buckle

Tongue

D-28 Driver’s  
seat belt switch  
connector

0002

(7)

Remove  the  driver’s  seat  belt  from  the  driver’s  seat  belt
switch.

(8)

Disconnect SRS-ECU connector C-27 and measure at the
harness side.

ZC600210

A

Lock lever

0000

(9)

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.

 

ZC5007880059

C-27 Harness side 
connector (front view)

(10)

Measure the resistance between terminal 56, 57 and body
ground.
It should be an open circuit

 

52B-140

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

SRS AIR BAG DIAGNOSIS

ZC500788

C-27 Harness side 
connector (front view)

0060

(11)

Measure the resistance between terminal 3 and terminal 4.
It should be an open circuit

Q:Does the resistance meet the value above?

YES:

 Erase the diagnostic trouble code memory, and check

the diagnostic trouble code. If DTC B1B50, B1B51or B1B52
are set, replace the SRS-ECU. (Refer to P.52B-326.) Then
go to Step 6.

NO:

 Go to Step 5.

STEP 5. Check the harness wires between SRS-ECU
connector C-27 (terminal No.56 and 57) and driver’s seat
belt switch connector D-28 (terminal No.3 and 4).

Q:Are  harness  wires  between  SRS-ECU  connector  C-27

(terminal  No.56  and  57)  and  driver’s  seat  belt  switch

connector D-28 (terminal No.3 and 4) in good condition?

YES:

 Go to Step 6.

NO:

 Replace the harness wires between SRS-ECU connector

C-27 and driver’s seat belt switch connector D-28. Then
go to Step 6.

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 B1B50, B1B51 or B1B52 set?

YES:

 Return to Step 1.

NO:

 The procedure is complete.

DTC B1B54: Seat Belt Switch (RH) Circuit (Ground Side) Shorted
DTC B1B55: Seat Belt Switch (RH) Circuit (Power Supply Side) Shorted

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-141

SRS AIR BAG DIAGNOSIS

DTC B1B56: Seat Belt Switch (RH) Circuit Open

M15204000997USA0000010000

SEAT BELT SWITCH 
(DRIVER'S SIDE)

SEAT BELT SWITCH 
(PASSENGER'S SIDE)

SRS-ECU

Seat belt Switch Circuit

ZC600876

Connector: C-27

C-27 (Y)

0025

ZC6008790022

Connector: D-32

D-32 (B)

 

If DTC B1B54, B1B55 or B1B56 are set in the SRS-
ECU, always diagnose the CAN main bus lines.

CIRCUIT OPERATION
The  SRS-ECU  determines  whether  the  seat  belt  is
fastened or not according to the connection location
of the seat belt switch in the seat buckle.

52B-142

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

SRS AIR BAG DIAGNOSIS