Mitsubishi Evolution X. Manual - part 680

 

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Mitsubishi Evolution X. Manual - part 680

 

 

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-167

STEP 3. Check the seat belt buckle switch (passenger’s 
side) connector D-37. Measure the resistance and voltage 
at SRS-ECU connector C-36.
(1) Disconnect the negative battery terminal.
(2) Disconnect the seat belt buckle switch (passenger’s side) 

connector D-37.

(3) 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-36 SRS-ECU connector.

(4) Measure the resistance between terminal 55, 58 and body 

ground (No. B1B54 only).
It should be an open circuit.

(5) Measure the voltage between terminal 55, 58 and body 

ground (No. B1B55 only).
Voltage should measure 0 voltage.

Q: Is the check result normal?

YES : Go to Step 5
NO :  Go to Step 4.

STEP 4. Check the harness wires between SRS-ECU 
connector C-36 (terminal No.55 and 58) and the seat belt 
buckle switch (passenger’s side) connector D-37 (terminal 
No.1 and 2) (No. B1B56 only).
Q: Are harness wires between SRS-ECU connector C-36 

(terminal No.55 and 58) and the seat belt buckle switch 
(passenger’s side) connector D-37 (terminal No.1 and 2) 
in good condition?
YES : 
Go to Step 6.
NO :  Repair the harness wires between SRS-ECU 

connector C-36 and the seat belt buckle switch 
(passenger’s side) connector D-37. Then go to Step 
6.

AC507645

A

AC

Lock lever

AC608812

C-36 Harness side 
connector (front view)

GB

AC608813

C-36 Harness side 
connector (front view)

CD

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-168

STEP 5. Check the harness wires between SRS-ECU 
connector C-36 (terminal No.55 and 58) and the seat belt 
buckle switch (passenger’s side) connector D-37 (terminal 
No.1 and 2).
(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-36 SRS-ECU connector.

(3) Disconnect the seat belt buckle switch (passenger’s side) 

connector D-37.

CAUTION

Do not insert a probe into the terminal from D-37 harness 
side connector front side directly, as the connector contact 
pressure may be weakened.

(4) Check for continuity between the following terminals. It 

should be less than 2 ohms.

• SRS-ECU connector C-36 (terminal No.55) and the seat 

belt buckle switch (passenger’s side) connector D-37 
(terminal No.1)

• SRS-ECU connector C-36 (terminal No.58) and the seat 

belt buckle switch (passenger’s side) connector D-37 
(terminal No.2)

Q: Is the check result normal?

YES : go to Step 6.
NO :  Repair harness wires between SRS-ECU connector 

C-36 and the seat belt buckle switch (passenger’s 
side) connector D-37. Then go to Step 6.

STEP 6. Seat belt buckle switch continuity check 
(passenger’s side). 
Refer to GROUP 52A, Front Seat Belt 

P.52A-29

Q: Is the check result normal?

YES : Go to Step 7.
NO :  Replace the seat belt buckle switch (passenger’s 

side) (Refer to GROUP 52A, Front Seat Belt 

P.52A-28

).

STEP 7. 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 B1B54, B1B55 or B1B56 set?

YES : Replace the SRS-ECU (Refer to 

P.52B-383

).

NO :  The procedure is complete.

AC506734

A

AD

Lock lever

AC608812

D-37 Harness side 
connector 
(rear view)

HR

C-36 Harness side 
connector (front view)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-169

DTC B1B70: Malfunction of G-sensor inside Front Impact Sensor (LH)

 

DTC B1B71: Malfunction of G-sensor inside Front Impact Sensor (RH)

CAUTION

If DTC B1B70 or B1B71 is set in the SRS-ECU, 
always diagnose the CAN main bus line.

.

DTC SET CONDITIONS

These DTCs are set if the following conditions are 
detected from the analog G-sensor inside the front 
impact sensor output:

• Analog G-sensor is not operating.

• Analog G-sensor characteristics are abnormal.

• Analog G-sensor output is abnormal.

.

TROUBLESHOOTING HINTS

Malfunction of front impact sensor (LH) (for DTC 
B1B70) and front impact sensor (RH) (for DTC 
B1B71)

DIAGNOSIS

Required Special Tool:

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

Diagnosis 

P.54C-14

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-170

STEP 2. Check the front impact sensor.
(1) Disconnect the negative battery terminal.
(2) A front impact sensor is checked in the following way.

• Replace the front impact sensor (LH) {In case of code 

B1B70 (Regardless of "Active" or "Stored" faults)} with 
new part.

• Replace the front impact sensor (RH) {In case of code 

B1B71 (Regardless of "Active" or "Stored" faults)} with 
new part.

(3) Connect the negative battery terminal.
(4) After erasing the diagnostic trouble code memory, check the 

diagnostic trouble code again.

Q: Is either DTC No. B1B70 or B1B71 set?

YES : Go to Step 3.
NO :  The procedure is complete.

STEP 3. Check the SRS-ECU.
(1) Disconnect the negative battery terminal.
(2) Replace the SRS-ECU with a new one (Refer to 

P.52B-383

). 

(3) Connect the negative battery terminal.
(4) Check the diagnostic trouble code again.
Q: Is either DTC No. B1B70 or B1B71 set?

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

DTC B1B72: Malfunction of G-sensor Inside Side Impact Sensor (LH)

 

DTC B1B75: Malfunction of G-sensor Inside Side Impact Sensor (RH)

CAUTION

If the diagnostic trouble code B1B72 or B1B75 is 
set in the SRS-ECU, always diagnose the CAN 
main bus line.

.

DTC SET CONDITIONS

These DTCs are set if the following conditions are 
detected from the analog G-sensor inside the side 
impact sensor output:

• Analog G-sensor is not operating.

• Analog G-sensor characteristics are abnormal.

• Analog G-sensor output is abnormal.

.

TROUBLESHOOTING HINTS

Malfunction of side impact sensor (LH) (for DTC 
B1B72) and side impact sensor (RH) (for DTC 
B1B75)

DIAGNOSTIC PROCEDURE

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)

 

 

 

 

 

 

 

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