Mitsubishi Evolution X. Manual - part 721

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-331

STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set the occupant classification-ECU.
(1) Zero calibration of occupant classification -ECU 
(2) Erase the DTC.
(3) Turn the ignition switch to the "ON" position.
(4) Check if the DTC is set.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the slide adjuster (RH) (Refer to GROUP 

52A, Front Seat Assembly 

P.52A-24

).

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

).

DTC B1C23: Passenger Seat Weight Sensor (front: LH) Configuration Mismatch

 

DTC B1C24: Passenger Seat Weight Sensor (front: RH) Configuration Mismatch

 

DTC B1C25: Passenger Seat Weight Sensor (rear: LH) Configuration Mismatch

 

DTC B1C26: Passenger Seat Weight Sensor (rear: RH) Configuration Mismatch

 

CAUTION

If DTC B1C23, B1C24 B1C25, B1C26 is set in the 
occupant classification-ECU, always diagnose 
the CAN main bus lines.

.

DTC SET CONDITIONS

The DTC is set if the weight sensor serial No. of the 
coding data in the occupant classification-ECU does 
not match the serial No. sent from the weight sensor. 

.

TROUBLESHOOTING HINTS

• Zero calibration not executed

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)

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-332

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

).

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 : Perform the zero calibration.
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

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-333

DTC B1CB2: Occupant Classification-ECU Parameter Table Incompatible

 

DTC B2212: Occupant Classification-ECU Internal Failure

 

DTC B2250: Occupant Classification-ECU not Parameter Flash Required

 

DTC B2262: Occupant Classification-ECU Electrostatic Discharge Event Detected

CAUTION

If DTC B1CB2, B2212, B2250, B2262 is set in the 
occupant classification-ECU, always diagnose 
the CAN main bus lines.

.

TROUBLE JUDGMENT 

The above DTC is set if an abnormality is detected in 
the circuit inside the occupant classification-ECU.

.

TROUBLESHOOTING HINTS

Malfunction of the occupant classification-ECU

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicles 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-334

STEP 2. Recheck for diagnostic trouble code.
Check again if the DTC is set.
(1) Erase the DTC.
(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if DTC is set.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?

YES : Replace the slide adjuster (RH) (Refer to GROUP 

52A, Front Seat Assembly 

P.52A-24

).

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

).