Mitsubishi Galant (2004+). Manual - part 1600

 

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Mitsubishi Galant (2004+). Manual - part 1600

 

 

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-293

STEP 2. Recheck for diagnostic trouble code.

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.00-6

).

STEP 3. Check the seat slide sensor. (Using scan tool 
MB991958, read the diagnostic trouble code.)
(1) Disconnect the negative battery terminal.

(2) Disconnect the seat slide sensor connector D-27.

(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-27 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 B1508 set?

YES : Go to Step 4.
NO :  Replace the seat slide sensor. (Refer to 

P.52B-384

). 

Then go to Step 5.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC308165

CONNECTOR : D-27

AC

D-27 (GR)

HARNESS SIDE

AC006042BQ

MB991866
(RESISTOR HARNESS)

D-27 HARNESS SIDE
CONNECTOR

D-27 SEAT SLIDE
SENSOR CONNECTOR

MB991865 (DUMMY 
RESISTOR: 3

 

Ω)

(REAR VIEW)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-294

STEP 4. Check the seat slide sensor circuit. Measure the 
voltage at the SRS-ECU connector C-122.

(1) Disconnect SRS-ECU connector C-122.

(2) Disconnect seat slide sensor connector D-27.
(3) Turn the ignition switch to the "ON" position.

CAUTION

Do not insert a test probe into the terminal from its front 
side directly, as the connector contact pressure may be 
weakened.
(4) Measure the voltage between C-122 harness side 

connector terminals 1, 2 and body ground.

Voltage should measure 0 volt.

Q: Is the measured voltage within the specified range?

YES : Erase the diagnostic trouble code memory, and check 

the diagnostic trouble code. If DTC B1508 sets, 
replace the SRS-ECU. (Refer to 

P.52B-365

). Then go 

to Step 6.

NO :  Go to Step 5.

AC305362

CONNECTOR: C-122

C-122 (Y)

AI

SRS-ECU

C-122 
Harness side
connector 
(rear view)

A

B

18

10

15

7

13

5

14

6

16

8

17

9

19

11

20

12

1 2

3 4

AC308165

CONNECTOR : D-27

AC

D-27 (GR)

HARNESS SIDE

AC308187

A

B

18

10

15

7

13

5

14

6

16

8

17

9

19

11

20

12

1 2

3 4

C-122 HARNESS SIDE
CONNECTOR
(REAR VIEW)

AB

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-295

STEP 5. Check the harness wires for short circuit to power 
supply between SRS-ECU connector C-122 (terminal No.2 
and 1) and seat slide sensor connector D-27 (terminal No.1 
and 2).

Q: Are the harness wires between SRS-ECU connector 

C-122 (terminal No.2 and 1) and seat slide sensor 
connector D-27 (terminal No.1 and 2) in good condition?
YES : 
Go to Step 6.
NO :  Replace the harness wires between SRS-ECU 

connector C-122 and seat slide sensor connector 
D-27. Then go to Step 6.

STEP 6. Recheck for diagnostic trouble code. 

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 B1508 set?

YES : Return to Step 1. 
NO :  The procedure is complete.

AC305362

CONNECTOR: C-122

C-122 (Y)

AI

SRS-ECU

C-122 
Harness side
connector 
(rear view)

A

B

18

10

15

7

13

5

14

6

16

8

17

9

19

11

20

12

1 2

3 4

AC308165

CONNECTOR : D-27

AC

D-27 (GR)

HARNESS SIDE

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-296

DTC B1509: Improper installation of SRS-ECU

CAUTION

If DTC B1509 is set in the SRS-ECU, always diag-
nose the CAN main bus line.

.

TROUBLE JUDGMENT
This DTC is set when an SRS-ECU, designed only 
for the driver's air bag, is installed on the vehicle, 
which has both driver's and passenger's air bags.

.

TROUBLESHOOTING HINTS

• Malfunction of the SRS-ECU

.

DIAGNOSIS

Required Special Tool:

•  MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A (Vehicles with CAN 

communication system)

STEP 1. 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-30

."

(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 54C, 

Diagnosis 

P.54C-14

).

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

 

 

 

 

 

 

 

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