Radio and CD Player
DTC U0151: SRS-ABG CAN time-out
CAUTION:
- If DTC U0151 is set, be sure to diagnose the CAN bus line.
- When replacing the radio and CD player, always check that the communication circuit is normal.
DIAGNOSTIC FUNCTION
If the signal from SRS-ECU cannot be received, the radio and CD player sets DTC U0151.
JUDGMENT CRITERIA
With the ignition switch in the ON position, system voltage between 10-16 volts
(data from ETACS-ECU), power supply fuse(IOD fuse) is OK, or odometer value is 80.5 km (50 miles) or more, and the communication with SRS-ECU cannot be established for 2,500 ms or more, the radio and CD player determines that a problem has occurred.
TROUBLESHOOTING HINTS
- The CAN bus line may be defective
- The radio and CD player may be defective
- The SRS-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
(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 SRS-ECU diagnostic trouble code
Check again if the DTC is set to the SRS-ECU.
Q. Is the DTC set?
YES Troubleshoot the SRS Supplemental Restraint System).
NO Go to Step 3.
STEP 3. Using scan tool MB991958, read the combination meter diagnostic trouble code.
Check if the DTC U0151 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 radio and CD player.
(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 SRS-ECU.
NO The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the SRS-ECU and the radio and CD player How to Cope With Intermittent Malfunctions).
STEP 5. 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 DTC is set.
(4)Turn the ignition switch to the "LOCK" (OFF) position.
Q. Is the DTC set?
YES Replace the radio and CD player.
NO The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the SRS-ECU and the radio and CD player How to Cope With Intermittent Malfunctions).