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DTC U0197: Hands free module CAN timeout
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- If DTC U0197 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.
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DIAGNOSTIC FUNCTION
When the signals from hands free module cannot be received, the radio and CD player sets DTC U0197.
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 communications with hands free module 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 hands free module may be defective.
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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)
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STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
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(1)
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To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
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Connect scan tool MB991958. Refer to "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?
 Go to Step 2.
 Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
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STEP 2. Using scan tool MB991958, read the hands free module diagnostic trouble code.
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Check again if the DTC is set to the hands free module.
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(1)Turn the ignition switch to the "ON" position.
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(2)Check for hands free module DTCs.
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(3)Turn the ignition switch to the "LOCK" (OFF) position.
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Troubleshoot the hands-free cellular phone system. (Refer to .)
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Go to Step 3.
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STEP 3. Using scan tool MB991958, read the ETACS-ECU diagnostic trouble code.
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Check if the DTC U0197 is set to the ETACS-ECU.
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Go to Step 4.
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Go to Step 5.
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STEP 4. Recheck for diagnostic trouble code.
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Check again if the DTC is set to the radio and CD player.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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Replace the hands free module.
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The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the hands free module and the radio and CD player (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
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STEP 5. Recheck for diagnostic trouble code.
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Check again if the DTC is set to the radio and CD player.
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(2)Turn the ignition switch from "LOCK" (OFF) position to "ON" position.
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(4)Turn the ignition switch to the "LOCK" (OFF) position.
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Replace the radio and CD player.
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The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the hands free module and the radio and CD player (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
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)