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If the voice guide "Unable to obtain vehicle speed. Please try again or contact your dealer for service" is sent from the speaker, the vehicle speed signal of hands free-ECU has a problem. At this time, the hands free-ECU, and the vehicle speed signal of radio and CD player may have a problem.
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- The hands free-ECU may be defective.
- The radio and CD player may be defective.
- Damaged harness wires and connectors
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Check if the speed compensated volume function of radio and CD player works normally during driving.
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Q.
Is the check result normal?
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Troubleshoot the radio and CD player (Refer to ).
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Use the M.U.T.-III to diagnose the CAN bus lines.
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Q.
Is the check result normal?
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Repair the CAN bus line (Refer to GROUP 54C - Troubleshooting ).
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Check again if the diagnosis code is stored in the radio and CD player.
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Q.
Is the diagnosis code stored?
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Troubleshoot the radio and CD player (Refer to ).
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Check if the hands free-ECU can be switched to the diagnosis mode.(Refer to <Vehicles with 1CD audio> or <Vehicles with display audio>.)
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Q.
Is the check result normal?
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Perform Inspection Procedure 5: "DIAGNOSIS MODE cannot be made an entry." (Refer to .)
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Q.
Is the check result normal?
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Replace the hands free-ECU.
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Replace the radio and CD player.
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