Mitsubishi Outlander GS45X. Manual - part 1449

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-291

• The SRS-ECU power is supplied from two cir-

cuits. Even if one circuit is shut off, the air bag 
can inflate.

.

DTC SET CONDITIONS

This code is set when an open circuit occurs in the 
power supply circuit to the SRS-ECU (terminal 
No.61) or in the power supply circuit to the SRS-ECU 
(terminal No.62). Also, if the code No. B212C and 
B212D are set at the same time, the battery voltage 
may have dropped. Therefore, check the battery first.

.

TROUBLESHOOTING HINTS

• Open circuit to power supply circuit

• Damaged wiring harnesses or connectors

• Malfunction of the SRS-ECU

• Malfunction of ETACS-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)

STEP 1. Power supply fuse number 12,18 check.
Q: Is the fuse in good condition?

YES : Go to Step 3.
NO :  Go to Step 2

STEP 2. Check for a blown fuse.
(1) Replace the fuse.
(2) Turn the ignition switch to the "ON" position, wait for at least 

one minute and then turn the switch off.

(3) Check the fuse.
Q: Is the fuse in good condition?

YES : Go to Step 3.
NO :  Repair the wiring harness between the C-313 

ETACS-ECU connector terminal No. 4/2 and the C-27 
SRS-ECU connector terminal No. 61/62, and replace 
the power supply fuse. 

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-292

STEP 3. Using scan tool MB991958, diagnose the CAN bus 
line.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the 

scan tool 

P.52B-28

."

(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 4.
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-17

).

STEP 4. Using scan tool MB991958, diagnose the ETACS.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect the 

scan tool 

P.52B-28

."

(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 : Diagnose the ETACS, (Refer to GROUP 54A, 

ETACS, Diagnosis 

P.54A-733

.

NO :  Check the input signal of ETACS-ECU ignition switch 

(IG1) (Refer to GROUP 54A 

− ETACS, Symptom 

procedures 

P.54A-789

). Than go to step 5.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-293

STEP 5. 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 6.
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 6. Resistance measurement at the C-28 SRS-ECU 
connector.
(1) 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-28 SRS-ECU connectors.

(2) Take the measurements below at the C-28 wiring harness 

side connectors. It should be less than 2 ohms.

• Continuity between C-28 wiring harness side connector 

terminal No. 17 and body ground

Q: Does continuity exist?

YES : Go to Step 7.
NO :  Repair the wiring harness between the C-28 

SRS-ECU connector terminal No. 17 and the ground.

ZC501967

AC404789

AC701411AB

MB991824

MB991827

MB991910

Data link 
connector

AC506734

A

AD

Lock lever

AC608812

C-28 Harness side 
connector (front view)

HD

SRS AIR BAG DIAGNOSIS

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SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-294

STEP 7. Measure the voltage at the C-27 SRS-ECU 
connector.
(1) Disconnect the negative battery terminal.
(2) 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.

(3) Connect the negative battery terminal.
(4) Ignition switch: ON

(5) Take the measurements below at the C-27 harness side 

connector. 

• Voltage between terminal No. 61/62 and body ground

OK: 9 V or more

Q: Is the measured voltage within the specified range?

YES : Go to Step 9.
NO :  Go to Step 8.

AC507645

A

AB

Lock lever

AC608813

C-27 Harness side 
connector (front view)

BQ