Mitsubishi Lancer Evolution IX. Manual - part 625

 

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Mitsubishi Lancer Evolution IX. Manual - part 625

 

 

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-13

Step 2. Resistance measurement at the SRS-ECU 
connector C-12.

(1) Disconnect SRS-ECU connector C-12.

CAUTION

Do not insert a test probe into the terminal from 
its front side directly as the connector contact 
pressure may be weakened.
(2) Take the measurements below at harness-side 

connector C-12.

• Resistance between terminals 1 and 2 as well 

as 3 and 4.

NG: 2 ohms or less (short circuit) or 2 
megaohms or more (open circuit) 

• Continuity between terminals 1, 2, 3, 4 and 

body earth

OK: No continuity

Q: Is the check result satisfactory?

YES : 

Go to Step 3.

NO : 

Go to Step 4.

Step 3. Voltage measurement at the SRS-ECU 
connector C-12.

(1) Disconnect SRS-ECU connector C-12.

CAUTION

Do not insert a test probe into the terminal from 
its front side directly as the connector contact 
pressure may be weakened.
(2) Take the measurements below at harness-side 

connector C-12.

• Voltage between terminals 1, 2, 3, 4 and body 

earth

OK: 0V

Q: Is the check result satisfactory?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

AC101950AJ

SRS-ECU

Harness side 
connector 
(rear view)
 

C-12 (Y)

Connector: C-12

AC100338

AC103684

1314151617181920

5 6 7 8 9 101112

1 2

3 4

AC103683 AK

C-12 Harness side 
(Rear View)
 

AC100338 

1314151617181920

5 6 7 8 9 101112

1 2

3 4

AC103684 AK

C-12 Harness side 
(Rear View)
 

AC103372

4

1

2

3

5

7

6

8

16

15

14

13

12

11

10

9

20

19

18

17

AI

C-12 Harness side 
(Rear View)
 

AC101950AJ

SRS-ECU

Harness side 
connector 
(rear view)
 

C-12 (Y)

Connector: C-12

4

1

2

3

5

7

6

8

16

15

14

13

12

11

10

9

20

19

18

17

AC210613

C-12 Harness side 
(Rear View)
 

AB

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-14

Step 4. Check the wiring harness between the 
right front impact sensor connector A-37 
(terminals 1 and 2) and SRS-ECU connector C-12 
(terminals 1 and 2) as well as between left front 
impact sensor connector A-33 (terminals 1 and 2) 
and SRS-ECU connector C-12 (terminals 3 and 4).

NOTE: 

AC310431

Connector: A-37 <LHD>

AF

Harness side 
(front view)

A-37 (Y)

2

1

AC310433

Connector: A-37 <RHD>

AE

Harness side 
(front view)

A-37 (Y)

2

1

AC101950AJ

SRS-ECU

Harness side 
connector 
(rear view)
 

C-12 (Y)

Connector: C-12

AC310542

Connectors: A-33 <LHD>

AE

A-33 (Y)

Harness side 
(front view)

2

1

AC310475

Connector: A-33 <RHD>

AD

A-33 (Y)

Harness side 
(front view)

2

1

AC310452

AW

Connector: C-111 
<LHD>

AC310456

Connector: C-111

AT

<RHD>

AC310446

Connector: C-129 <LHD>

BD

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-15

Prior to the wiring harness inspection, check interme-
diate connectors C-111 and C-129, and repair if nec-
essary.

• Check the front impact sensor output line for 

open or short circuit.

Q: Is the check result satisfactory?

YES : 

Go to Step 4.

NO : 

Repair the wiring harness.

Step 5. Check whether the diagnosis code is 
reset.
Check again if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Turn the ignition switch to the "ON" position.
(3) Check if the diagnosis code is set.
(4) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Is diagnosis code 1A, 1B, 1C, 1D, 2A, 2B, 2C or 2D 

set?
YES : 

Replace the SRS-ECU (Refer to 

P.52B-109

).

NO : 

The procedure is complete. (If no 
malfunctions are found in all steps, an 
intermittent malfunction is suspected. Refer 
to GROUP 00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

Code No.14: Analogue G-sensor malfunction

 

Code No.15: Safing G-sensor (for frontal collision) short-circuited

 

Code No.16: Safing G-sensor (for frontal collision) open-circuited

 

Code No.31: SRS-ECU capacitor circuit voltage too high

 

Code No.32: SRS-ECU capacitor circuit voltage too low

 

Code No.45: SRS-ECU non-volatile memory (EEPROM) and A/D converter system

 

Code No.51: Driver's air bag squib activating circuit short-circuited

 

Code No.52: Driver's air bag squib activating circuit open-circuited

 

Code No.54: Passenger's (front) air bag squib activating circuit short-circuited

 

Code No.55: Passenger's (front) air bag squib activating circuit open-circuited

 

Code No.56: Driver’s seat belt pre-tensioner activating circuit short-circuited

 

Code No.57: Driver’s seat belt pre-tensioner activating circuit open-circuited

 

Code No.58: Passenger’s (front) seat belt pre-tensioner activating circuit short-circuited

 

Code No.59: Passenger’s (front) seat belt pre-tensioner activating circuit open-circuited

AC310454

Connector: C-129 <RHD>

AV

TROUBLESHOOTING

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-16

DIAGNOSIS CODE SET CONDITIONS

These diagnosis codes are set when a fault is 
detected in the SRS-ECU. The most likely causes for 
this code to be set are shown in the table below:

PROBABLE CAUSE

Malfunction of the SRS-ECU

DIAGNOSIS PROCEDURE

Replace the SRS-ECU (Refer to 

P.52B-109

).

Code No.

Part/Circuit integral to 
SRS-ECU

Trouble causes

14

Analog G-sensor

• When the analog G-sensor is not operating

• When the characteristics of the analog G-sensor are 

abnormal

• When the output from the analog G-sensor is 

abnormal

15

Safing G-sensor (for frontal 
collision)

• Short circuit in the safing G-sensor

16

• Open circuit in the safing G-sensor

31

Capacitor circuit

• Voltage at the capacitor terminal is higher than the 

specified value for five seconds or more

32

• Voltage at the capacitor terminal is lower than the 

specified value for five seconds or more (This is not 
detected if diagnosis code No.41 or 42 indicating 
battery positive voltage drop has been output).

45

Non-volatile memory (EEPROM) 
and A/D converter

• When the non-volatile memory (EEPROM) and A/D 

converter system are abnormal

51

Driver's air bag module (squib 
ignition drive circuit)

• Short circuit in the squib ignition drive circuit

52

• Open circuit in the squib ignition drive circuit

54

Passenger's (front) air bag 
module (squib ignition drive 
circuit)

• Short circuit in the squib ignition drive circuit

55

• Open circuit in the squib ignition drive circuit

56

Driver’s seat belt pre-tensioner 
(squib ignition drive circuit)

• Short circuit in the squib ignition drive circuit

57

• Open circuit in the squib ignition drive circuit

58

Passenger’s (front) seat belt 
pre-tensioner (squib ignition drive 
circuit)

• Short circuit in the squib ignition drive circuit

59

• Open circuit in the squib ignition drive circuit

 

 

 

 

 

 

 

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