Mitsubishi Outlander GS45X. Manual - part 1430

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-215

DTC B1C2E: Side-air bag Module (RH) (Squib) System (Short Circuit between Squib Circuit Terminals)

CAUTION

If DTC B1C2E is set in the SRS-ECU, always diag-
nose the CAN bus lines.

.

CIRCUIT OPERATION

• The SRS-ECU judges how severe a collision is 

by detecting signals from the side impact sensor 
installed on the lower side of the center pillar. 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 side-air bag 

module to inflate the side-air bag.

.

DTC SET CONDITIONS

This DTC is set if there is abnormal resistance 
between the input terminals of the side-air bag mod-
ule (RH) (squib).

.

TROUBLESHOOTING HINTS

• Improper engaged connector or defective short 

spring*

• Short between the side-air bag module (RH) 

(squib) circuit terminals

• Damaged connector(s)

• Malfunction of the SRS-ECU

CONNECTOR
LOCK SWITCH

SRS-ECU

Side-Airbag Module (Squib) (RH) Circuit

CONNECTOR
LOCK SWITCH

: CONNECTOR COUPLED: ON
  CONNECTOR UNCOUPLED: OFF

NOTE

SIDE-AIRBAG
MODULE
(SQUIB) (RH)

AC901076

C-27 (Y)

AC

Connector: C-27

AC901079

Connector: D-31

AF

D-31 (Y)

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-216

NOTE: *: The squib circuit connectors integrate a 
"short" spring (which prevents the air bag 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-3

). Therefore, if connector C-27 or 

D-31 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 resister

• MB991866: Resister harness

STEP 1. Using scan tool MB991934, diagnose the CAN bus 
line.

CAUTION

To prevent damage to scan tool MB991934, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991934.
(1) Connect scan tool MB991934. Refer to "How to connect the 

scan tool 

P.52B-28

."

(2) Turn the ignition switch to "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the check result satisfactory?

YES : Go to Step 2.
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-17

).

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-217

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 Cope with Intermittent 
Malfunction 

P.00-15

).

STEP 3. Check SRS-ECU connector C-27 and side-air bag 
module (RH) connector D-31. (Using scan tool MB991958, 
read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) While pressing the part A in the illustration of the C-27 

SRS-ECU harness side connector, turn the lock lever 
toward the arrow direction to release the lock lever. Then, 
disconnect the connector and reconnect it.

(3) Disconnect the D-31 side-airbag module connector, and 

then reconnect it. Unlock the connector by sliding the 
locking button to the direction of the arrow as shown in the 
figure, and then disconnect the connector.

(4) Connect the negative battery terminal.
(5) Erase the diagnostic trouble code memory, and check the 

diagnostic trouble code.

Q: Is DTC B1C2E out put?

YES : Go to Step 4.
NO :  The procedure is complete. It is assumed that DTC 

B1C2E set because connector C-27 or D-31 was 
engaged improperly.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

AC507645

A

AC

Lock lever

AC706606

AI

Locking button

Side-airbag 

module

connector

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-218

STEP 4. Check the side-air bag module (RH). (Using scan 
tool MB991934, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.
(2) Disconnect the D-31 side-airbag module connector, and 

then reconnect them, 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 test probe into the terminal from its front 
side directly, as the connector contact pressure may be 
weakened.
(4) Insert special tool MB991866 into the D-31 harness side 

connector by backprobing.

(5) Connect the negative battery terminal.
(6) Erase the diagnostic trouble code memory, and check the 

diagnostic trouble code. 

Q: Is DTC B1C2E set?

YES : Go to Step 5.
NO :  Replace the seatback assembly (Refer to GROUP 

52A, Front Seat Assembly 

P.52A-19

). Then go to 

Step 7.

AC706606

AI

Locking button

Side-airbag 

module

connector

AC507310AQ

D-31 

Side-airbag 

module (RH) connector

D-31 
Harness side 
connector

MB991865
(Dummy resistor: 3    )

MB991866 

(Resistor harness)