DTC U0245 AND [Audio visual Navigation (HDD) unit] CAN timeout

caution

If DTC U0245 is set, be sure to diagnose the CAN bus line.
When replacing the ECU, always check that the communication circuit is normal.

DIAGNOSTIC FUNCTION

When the signals from CAN box unit (audio visual navigation unit) cannot be received, the hands free module sets the diagnostic trouble code No. U0245.

TROUBLESHOOTING HINTS

The CAN bus line may be defective.
The hands free module may be defective.
The CAN box unit may be defective.

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

(1)

caution

To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III)

."
(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?

Go to Step 2.

Repair the CAN bus line (Refer to GROUP 54C, Diagnosis

STEP 2. Using scan tool MB991958, read the CAN box unit diagnostic trouble code

Check the DTC is set to the CAN box unit.

Q. Is the DTC set?

	Troubleshoot the CAN box unit (Refer to MMCS - Diagnostic Trouble Code Chart ).

	Go to Step 3.

STEP 3. Using scan tool MB991958, read the ETACS diagnostic trouble code.

Check if the DTC U0245 is set to the ETACS-ECU.

Q. Is the DTC set?

	Go to Step 4.

	Go to Step 5.

STEP 4. Recheck for diagnostic trouble code.

Check again if the DTC is set to the hands free module.

(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?

	Replace the CAN box unit (multivision display).

	The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the CAN box unit (multivision display) and the hands free module (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).

STEP 5. Recheck for diagnostic trouble code.

Check again if the DTC is set to the hands free module.

(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?

	Replace the hands free module.

	The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the CAN box unit (multivision display) and the hands free module (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).