Keyless Operation System (KOS)

DTC U0184: Audio CAN time-out

CAUTION:

- If the DTC U0184 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 radio and CD player or CD changer cannot be received, the KOS-ECU sets the DTC U0184.

TROUBLESHOOTING HINTS

- The CAN bus line may be defective.
- The KOS-ECU may be defective.
- The radio and CD player or CD changer may be defective.

DIAGNOSIS

STEP 1. Using scan tool MB991958, diagnose the CAN bus line

(1)
CAUTION:
To prevent damage to scan tool (MB991958), always turn the power supply mode of the engine switch to the 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) Reading and Clearing Diagnostic Trouble Codes."

(2)Turn the power supply mode of the engine switch to ON.

(3)Diagnose the CAN bus line.

(4)Turn the power supply mode of the engine switch to OFF.

Q. Is the CAN bus line found to be normal?

YES Go to Step 2.
NO Repair the CAN bus line CAN Bus Diagnostics Chart).
STEP 2. Using scan tool MB991958, read the audio diagnostic trouble code

Check again if the DTC is set to the audio.

Q. Is the DTC set?

YES Troubleshoot the radio and CD player. Radio and CD Player.
NO Go to Step 3.
STEP 3. Using scan tool MB991958, read the other system diagnostic trouble code.

Check if DTC U0184 is set to the combination meter.

Q. Is the DTC set?

YES Go to Step 4.
NO Go to Step 5.
STEP 4. Recheck for diagnostic trouble code.

Check again if the DTC is set to the KOS-ECU.

(1)Erase the DTC.

(2)Turn the power supply mode of the engine switch from OFF to ON.

(3)Check if DTC is set.

(4)Turn the power supply mode of the engine switch to OFF.

Q. Is the DTC set?

YES Replace the radio and CD player or CD changer.
NO The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).
STEP 5. Recheck for diagnostic trouble code.

Check again if the DTC is set to the KOS-ECU.

(1)Erase the DTC.

(2)Turn the power supply mode of the engine switch from OFF to ON.

(3)Check if DTC is set.

(4)Turn the power supply mode of the engine switch to OFF.

Q. Is the DTC set?

YES Replace KOS-ECU and register the ID codes (Refer to ID Codes Registration Procedure).
NO The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).