DTC No.U0184 AUDIO CAN timeout

caution

If DTC U0184 is set, be sure to diagnose the CAN bus line.
When replacing the module, always check that the communication circuit is normal.

TECHNICAL DESCRIPTION (COMMENT)

If the signal from the radio and CD player cannot be received, the hands free module sets the diagnostic trouble code No. U0184.

TROUBLESHOOTING HINTS

The radio and CD player may be defective.
The hands free module may be defective.
The CAN bus may be defective.

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.

(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 radio and CD player or CD changer diagnostic trouble code.

Check if DTC is set to the radio and CD player.

Q. Is the DTC set?

	Troubleshoot the radio and CD player (Refer to ).

	Go to Step 3.

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

Check if the DTC U0184 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 radio and CD player.

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