Satellite Radio Tuner
DTC U0019: Bus Off (CAN-B)CAUTION:
- If DTC U0019 is set, be sure to diagnose the CAN bus line.
- When replacing the satellite radio tuner, always check that the communication circuit is normal.
DIAGNOSTIC FUNCTION
If the CAN-B circuit malfunction occurs, the satellite radio tuner sets DTC U0019.
JUDGMENT CRITERIA
With the ignition switch at the ON position and the system voltage at 10 - 16 volts (data from ETACS-ECU), if the Satellite radio tuner becomes unable to transmit data normally due to the CAN-B bus circuit malfunction, the satellite radio tuner determines that a problem has occurred.
TROUBLESHOOTING HINTS
The satellite radio tuner 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.
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.
1. Connect scan tool MB991958. Refer to "How to connect the Scan Tool (M.U.T.-III)." 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?
YES : Go to Step 2.
NO : Repair the CAN bus line.
STEP 2. Check for diagnostic trouble code.
Check again if the DTC is set to the satellite radio tuner
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?
YES : Erase the diagnostic trouble code. The procedure is complete.
NO : Check the power supply circuit of the satellite radio tuner, and repair if necessary.