Occupant Classification-ECU

DTC U0195: Satellite Radio Tuner CAN Time-Out

CAUTION:
- If the DTC U0195 is set in the occupant classification-ECU, always diagnose the CAN main bus lines.
- When replacing the ECU, always check that the communication circuit is normal.

TROUBLE JUDGEMENT
If the signal from satellite radio tuner cannot be received, the occupant classification-ECU sets the DTC U0195.

JUDGEMENT CRITERIA
Because of the CAN-B bus circuit malfunction, if occupant classification-ECU becomes unable to perform the normal data transmission, occupant classification-ECU determines that an abnormality is present.

TROUBLESHOOTING HINTS
- The CAN bus may be defective.
- The satellite radio tuner may be defective.
- The occupant classification-ECU 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 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 (Refer to Diagnosis CAN Bus Diagnostics Chart).

STEP 2. Using scan tool MB991958, read the satellite radio tuner diagnostic trouble code.
Check if DTC is set to the satellite radio tuner.

Q : Is the DTC set?

YES : Diagnose the satellite radio. Then go to Step 4.

NO : Go to Step 3.

STEP 3. Using scan tool MB991958, read diagnostic trouble code No. U0195 for other system.
Check if the DTC U0195 is set in ETACS-ECU, SRS-ECU, A/C-ECU, hands free module, CAN box unit, radio and CD player.

Q : Is the DTC set?

YES : Replace the satellite radio tuner.

NO : Go to Step 4.

STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set to the occupant classification-ECU.

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 : Replace the front seat cushion frame (RH) [EXCEPT RALLIART] or replace the slide adjuster (RH) [RALLIART].

NO : There is an intermittent malfunction such as poor engaged connector(s) or open circuit. (Refer to How to Cope with Intermittent Malfunction Troubleshooting Contents).