Radio and CD Player

DTC U1415: Coding not completed/Data fail

CAUTION:
If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be set. Prior to this diagnosis, always diagnose the CAN bus lines.

CAUTION:
Before replacing the radio and CD player, be sure to check that the power supply circuit, ground circuit, and communication circuit are normal.

TROUBLE JUDGMENT

When the vehicle information data is not registered to the audio unit, the radio and CD player sets the diagnostic trouble code No.U1415.

TECHNICAL DESCRIPTION (COMMENT)

The audio unit, ETACS-ECU, or CAN bus line may have a problem.

TROUBLESHOOTING HINTS

- Malfunctions of radio and CD player
- Malfunction of the ETACS-ECU
- Malfunction of CAN bus line wiring harness and connector

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

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) Scan Tool Testing and Procedures."
(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. CAN Bus Diagnostics Chart).

STEP 2. Using scan tool MB991958, read the other system DTC.

Check if the diagnostic trouble code relating to the coding error is set to the ETACS-ECU.

(1)Turn the ignition switch to the "ON" position.

(2)Check for DTCs.

(3)Turn the ignition switch to the "LOCK" (OFF) position.

Q. Is the DTC set?

YES Diagnose the ETACS-ECU Electronic Time and Alarm Control System (ETACS)), and then go to Step 3.
NO Go to Step 3.
STEP 3. Recheck for diagnostic trouble code.

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

(1)Erase the DTC.

(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.

(3)Check if the DTC is set.

Q. Is the DTC set?

YES Replace the radio and CD player.
NO The trouble can be an intermittent malfunction How to Cope With Intermittent Malfunctions).