DTC: U0197:00/26:Er81 [Bluetooth SYSTEM (HANDS-FREE TELEPHONE (HF/TEL) SYSTEM)]
id0902g8408200
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Description |
• U0197:00: Communication error with audio unit
• 26:Er81: CAN system communication error
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Detection condition
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CAN signal is not sent from Bluetooth unit
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Fail-safe function
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Not applicable
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Possible cause
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• Short in wiring harness between Bluetooth unit and audio unit, short to power supply, short or open circuit to ground
• Audio unit malfunction
• Bluetooth unit malfunction
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Diagnostic Procedure
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Step |
Inspection |
Action |
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1
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INSPECT FOR SHORT BETWEEN CAN CIRCUITS
• Remove the glove compartment.
• Switch the ignition ON (engine off or on).
• Measure the voltage between the following terminals:
• Are the measured voltage values between the 2 terminals the same?
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Yes
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Go to the next step.
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No
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Go to Step 4.
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2
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DETERMINE IF SHORT OCCURRING BETWEEN LINES IS IN AUDIO UNIT
• Switch the ignition off (LOCK).
• Disconnect the negative battery cable.
• Remove the audio unit.
• Disconnect the audio unit connector.
• Connect the negative battery cable.
• Switch the ignition ON (engine off or on).
• Measure the voltage between the following terminals:
• Are the measured voltage values between the 2 terminals the same?
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Yes
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Go to the next step.
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No
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Replace the audio unit because there is a short between circuits in the audio unit.
After replacement, go to Step 13.
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3
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DETERMINE IF SHORT OCCURRING BETWEEN LINES IS IN BLUETOOTH UNIT
• Switch the ignition off (LOCK).
• Disconnect the negative battery cable.
• Remove the Bluetooth unit.
• Disconnect the Bluetooth unit connector.
• Connect the negative battery cable.
• Switch the ignition ON (engine off or on).
• Measure the voltage between the following terminals:
• Are the measured voltage values between the 2 terminals the same?
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Yes
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Repair or replace the wiring harness between the audio unit and the Bluetooth unit because the wiring harness is shorted between circuits, then go to Step 13.
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No
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Replace the Bluetooth unit because there is a short between circuits in the Bluetooth unit.
After replacement, go to Step 13.
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4
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INSPECT FOR SHORT TO POWER SUPPLY IN CAN CIRCUIT
• Measure the voltage between the following terminals:
• Can B+ voltage be measured?
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Yes
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Go to the next step.
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No
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Go to Step 7.
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5
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DETERMINE IF SHORT TO POWER SUPPLY IS OCCURRING IN AUDIO UNIT
• Switch the ignition off (LOCK).
• Disconnect the negative battery cable.
• Remove the audio unit.
• Disconnect the audio unit connector.
• Connect the negative battery cable.
• Switch the ignition ON (engine off or on).
• Measure the voltage between the following terminals:
• Can B+ voltage be measured?
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Yes
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Go to the next step.
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No
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Replace the audio unit because there is a short to the power supply in the audio unit.
After replacement, go to Step 13.
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6
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DETERMINE IF SHORT TO POWER IS OCCURRING IN BLUETOOTH UNIT
• Switch the ignition off (LOCK).
• Disconnect the negative battery cable.
• Remove the Bluetooth unit.
• Disconnect the Bluetooth unit connector.
• Connect the negative battery cable.
• Switch the ignition ON (engine off or on).
• Measure the voltage between the following terminals:
• Can B+ voltage be measured?
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Yes
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Repair or replace the wiring harness between the audio unit and the Bluetooth unit because the wiring harness is shorted to the power supply, then go to Step 13.
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No
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Replace the Bluetooth unit because there is a short to the power supply in the Bluetooth unit.
After replacement, go to Step 13.
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7
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INSPECT FOR SHORT TO GROUND IN CAN CIRCUIT
• Switch the ignition off (LOCK).
• Disconnect the negative battery cable.
• Inspect for continuity between the following terminals:
• Is there continuity?
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Yes
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Go to the next step.
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No
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Go to Step 10.
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8
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DETERMINE IF SHORT TO GROUND IS OCCURRING IN AUDIO UNIT
• Remove the audio unit.
• Disconnect the audio unit connector.
• Inspect for continuity between the following terminals:
• Is there continuity?
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Yes
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Go to the next step.
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No
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Replace the audio unit because there is a short to ground inside the unit.
After replacement, go to Step 13.
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9
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DETERMINE IF SHORT TO GROUND IS OCCURRING IN BLUETOOTH UNIT
• Remove the Bluetooth unit.
• Disconnect the Bluetooth unit connector.
• Inspect for continuity between the following terminals:
• Is there continuity?
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Yes
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Repair or replace the wiring harness between the audio unit and the Bluetooth unit because the wiring harness is shorted to ground, then go to Step 13.
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No
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Replace the Bluetooth unit because there is a short to ground inside the unit.
After replacement, go to Step 13.
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10
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INSPECT CAN CIRCUIT FOR OPEN CIRCUIT
• Remove the audio unit.
• Disconnect the audio unit connector.
• Remove the Bluetooth unit.
• Disconnect the Bluetooth unit connector.
• Inspect for continuity between the following terminals:
• Is there continuity?
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Yes
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Go to the next step.
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No
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Go to Step 13.
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11
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INSPECT AUDIO UNIT RESISTANCE
• Inspect the resistance between the audio unit terminal 2I and terminal 2J (part side).
• Is the resistance 118―130 Ω?
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Yes
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Go to the next step.
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No
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Replace the audio unit.
After replacement, go to Step 13.
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12
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INSPECT BLUETOOTH UNIT RESISTANCE
• Inspect the resistance between Bluetooth unit terminals S and T (part side).
• Is the resistance 118―130 Ω?
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Yes
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Go to the next step.
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No
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Replace the Bluetooth unit.
After replacement, go to the next step.
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13
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VERIFY THAT REPAIRS HAVE BEEN COMPLETED
• Connect all the connectors.
• Perform an inspection of the Bluetooth unit DTCs.
• Is the same DTC displayed?
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Yes
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Return to Step 1 and inspect for other possible causes. If the malfunction recurs, replace the Bluetooth unit, then go to the next step.
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No
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Go to the next step.
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14
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VERIFY IF OTHER DTCs DISPLAYED
• Are any other DTCs displayed?
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Yes
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Repair the malfunctioning part according to the applicable DTC troubleshooting.
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No
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DTC troubleshooting completed.
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