52B-TROUBLE CODE DIAGNOSIS

DIAGNOSTIC FUNCTION

HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE)

Required Special Tools:

MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
MB992745: V.C.I.-Lite main harness A
MB992747: V.C.I.-Lite USB cable short
MB992748: V.C.I.-Lite USB cable long

caution

To prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).

1. Ensure that the ignition switch is at the "LOCK" (OFF) position.

2. Start up the personal computer.

3. Connect special tool MB992747/M992748 to special tool MB992744 and the personal computer.

4. Connect special tool MB992745 to special tool MB992744.

5. Connect special tool MB992745 to the data link connector.

note	When the special tool MB992745 is connected to the data link connector, the special tool MB992744 indicator light will be illuminated in a green color.

6. Start the scan tool (M.U.T.-IIISE) system on the personal computer.

note	Disconnecting scan tool (M.U.T.-IIISE) is the reverse of the connecting sequence, making sure that the ignition switch is at the "LOCK" (OFF) position.

HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES

Required Special Tools:

MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
MB992745: V.C.I.-Lite main harness A
MB992747: V.C.I.-Lite USB cable short
MB992748: V.C.I.-Lite USB cable long

note	If the battery voltage is low, diagnostic trouble codes will not be set. Check the battery if scan tool (M.U.T.-IIISE) does not display.

1. Connect scan tool (M.U.T.-IIISE) to the data link connector.

2. Turn the ignition switch to the "ON" position.

3. Select "STV."

4. Select "SRS-AIR BAG" from "System List," and press the "OK" button. <SRS-ECU>

5. Select "OCM" from "System List," and press the "OK" button. <Occupant classification-ECU>

6. Select "Diagnostic Trouble Code" to read the DTC.

7. If a DTC is set, it is shown.

8. Choose "Erase DTCs" to erase the DTC.

HOW TO READ DATA LIST

Required Special Tools:

MB992744: Vehicle communication interface-Line (V.C.I.-Line)
MB992745: V.C.I.-Line main harness A (for vehicle with CAN communication)
MB992747: V.C.I.-Line USB cable short
MB992748: V.C.I.-Line USB cable long

1. Connect scan tool (M.U.T.-IIISE) to the data link connector.

2. Turn the ignition switch to the "ON" position.

3. Select "STV."

4. Select "SRS-AIR BAG" from "System List," and press the "OK" button. <SRS-ECU>

5. Select "OCM" from "System List," and press the "OK" button. <Occupant classification-ECU>

6. Select "Data List."

7. Choose an appropriate item and select the "OK" button.

HOW TO PERFORM ACTUATOR TEST <SRS-ECU>

Required Special Tools:

MB992744: Vehicle communication interface-Line (V.C.I.-Line)
MB992745: V.C.I.-Line main harness A (for vehicle with CAN communication)
MB992747: V.C.I.-Line USB cable short
MB992748: V.C.I.-Line USB cable long

1. Connect scan tool (M.U.T.-IIISE) to the data link connector.

2. Turn the ignition switch to the "ON" position.

3. Select "STV."

4. Select "SRS-AIR BAG" from "System List," and press the "OK" button.

5. Choose "Actuator Test."

6. Choose an appropriate item and select the "OK" button.

HOW TO DIAGNOSE THE CAN BUS LINES

Required Special Tools:

MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
MB992745: V.C.I.-Lite main harness A
MB992747: V.C.I.-Lite USB cable short
MB992748: V.C.I.-Lite USB cable long

1. Connect scan tool (M.U.T.-IIISE) to the data link connector.

2. Turn the ignition switch to the "ON" position.

3. Select "CAN bus diagnosis" from the start-up screen.

4. When the optional equipment screen is displayed, choose the one which the vehicle is fitted with, and then select the "OK" button.

CHECK OF FREEZE FRAME DATA <Occupant classification-ECU>

The freeze frame data can be checked by using the scan tool (M.U.T.-IIISE).

When detecting the trouble and setting the DTC, the ECU connected to CAN bus line obtains the data when the DTC is confirmed, and then stores the ECU status of that time. By analyzing each data from scan tool (M.U.T.-IIISE), the troubleshooting can be performed more efficiently. The displayed items are as the table below.

Display item list

Item No.	Item name	Data item	Unit
01	Odometer	Total driving distance when the DTC is generated	km/mile
02	Ignition cycle	Number of times the ignition switch is turned "ON" or "LOCK (OFF)" after the past failure transition	Number of counts is display
04	Accumulated minute	Cumulative time for current malfunction of DTC	min