Mitsubishi Evolution X. Manual - part 727

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-355

DTC U0245: Audio Visual Navigation Unit CAN timeout

CAUTION

• If DTC U0245 is set in the occupant classifica-

tion-ECU, always diagnose the CAN main bus 
lines.

• When replacing the ECU, always check that 

the communication circuit is normal.

.

DIAGNOSTIC FUNCTION

When the signals from audio visual navigation unit 
cannot be received, the occupant classification sys-
tem sets DTC U0245.

.

JUDGMENT CRITERIA

Because of the CAN-B bus circuit malfunction, if 
audio visual navigation becomes unable to perform 
the normal data transmission, occupant classifica-
tion-ECU determines that an abnormality is present.

.

TROUBLESHOOTING HINTS

• The CAN bus line may be defective.

• The occupant classification-ECU may be defec-

tive.

• The audio visual navigation unit may be defec-

tive.

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 (M.U.T.-III) 

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-356

STEP 2. Using scan tool MB991958, read the audio visual 
navigation unit diagnostic trouble code.
Check if DTC is set to the audio visual navigation unit.
Q: Is the DTC set?

YES : Diagnose the MMCS.
NO :  Go to Step 3.

STEP 3. Recheck for diagnostic trouble code.
Check again if the DTC is set to the occupant classifica-
tion-ECU.
(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

).

DTC U1419: The signal from a weight sensor (front: LH) is unusual

 

DTC U141A: The signal from a weight sensor (front: RH) is unusual

 

DTC U141B: The signal from a weight sensor (rear: LH) is unusual

 

DTC U141C: The signal from a weight sensor (rear: RH) is unusual

 

DTC U1423: The signal from a weight sensor is unusual

.

DTC SET CONDITIONS

There DTCs are set if communication between the 
weight sensor and the occupant classification-ECU is 
not possible or faulty.

.

TROUBLESHOOTING HINTS

Malfunction of weight sensor

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-357

STEP 1. 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 2.
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 2. Check the weight sensor.
Replace weight sensor
Check the diagnostic trouble code.
Q: Is DTC U1419, U141A, U141B, U141C, U1423 set?

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

52A, Front Seat Assembly 

P.52A-24

).

NO :  The procedure is complete.

TROUBLE SYMPTOM CHART

M1524003401186

CAUTION

During diagnosis, a DTC code associated with another system may be set when the ignition switch is 
turned on with connector(s) disconnected. After completing the repair, confirm all systems for DTC 
code(s). If DTC code(s) are set, erase them all.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

Symptom

Inspection procedure No. Reference page

Communication between the scan tool and the 
SRS-ECU is not possible.

1

P.52B-358

Power supply circuit system

2

P.52B-359

The SRS warning light does not illuminate.

3

P.52B-362

The SRS warning light does not go out.

4

P.52B-365

SRS AIR BAG DIAGNOSIS

TSB Revision

SUPPLEMENTAL RESTRAINT SYSTEM (SRS)

52B-358

SYMPTOM PROCEDURES

Inspection procedure 1: Communication between the Scan Tool and the SRS-ECU is not possible.

.

TECHNICAL DESCRIPTION (COMMENT)

If the scan tool (M.U.T.-III Sub Assembly) can not 
communicate with the SRS system, the CAN bus 
lines may be defective. If the SRS system does not 
work, the SRS-ECU or its power supply circuit may 
be defective. 

.

TROUBLESHOOTING HINTS (THE MOST 
LIKELY CAUSES FOR THIS CASE:)

• Damaged wiring harness or connector

• Malfunction of the SRS-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. 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 (M.U.T.-III) 

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 : Check and repair the power supply circuit system 

(Refer to 

P.52B-359

). 

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

Diagnosis 

P.54C-14

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB