DTC: U0197:00, 26:Er81 [Bluetooth SYSTEM (HANDS-FREE TELEPHONE (HF/TEL) SYSTEM)]

id0902g8407600

Description | Communication error with audio unit
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Detection condition | CAN signal is not sent from Bluetooth unit
Possible cause | • 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

Diagnostic Procedure

Step | Inspection | Action
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1 | INSPECT FOR SHORT BETWEEN CAN CIRCUITS • Remove the glove compartment (R.H.D.). (See GLOVE COMPARTMENT REMOVAL/INSTALLATION.) • Turn the ignition switch to the ON position. • Measure the voltage between the following terminals: ― Between Bluetooth unit terminal 1S and body ground ― Between Bluetooth unit terminal 1T and body ground • Are the measured voltage values between the 2 terminals the same? | Yes | Go to the next step.
No | Go to Step 4.
2 | DETERMINE IF SHORT OCCURRING BETWEEN LINES IS IN AUDIO UNIT • Turn the ignition switch to the OFF position. • Disconnect the negative battery cable. • Remove the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.) • Disconnect the audio unit connector. • Connect the negative battery cable. • Turn the ignition switch to the ON position. • Measure the voltage between the following terminals: ― Audio unit connector (vehicle wiring harness) terminal 2I and body ground ― Audio unit connector (vehicle wiring harness) terminal 2J and body ground • Are the measured voltage values between the 2 terminals the same? | Yes | Go to the next step.
No | Replace the audio unit because there is a short between circuits in the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.) After replacement, go to Step 13.
3 | DETERMINE IF SHORT OCCURRING BETWEEN LINES IS IN BLUETOOTH UNIT • Turn the ignition switch to the OFF position. • Disconnect the negative battery cable. • Remove the Bluetooth unit. (See Bluetooth UNIT REMOVAL/INSTALLATION.) • Disconnect the Bluetooth unit connector. • Connect the negative battery cable. • Turn the ignition switch to the ON position. • Measure the voltage between the following terminals: ― Audio unit connector (vehicle wiring harness) terminal 2I and body ground ― Audio unit connector (vehicle wiring harness) terminal 2J and body ground • Are the measured voltage values between the 2 terminals the same? | Yes | 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.
No | Replace the Bluetooth unit because there is a short between circuits in the Bluetooth unit. (See Bluetooth UNIT REMOVAL/INSTALLATION.) After replacement, go to Step 13.
4 | INSPECT FOR SHORT TO POWER SUPPLY IN CAN CIRCUIT • Measure the voltage between the following terminals: ― Between Bluetooth unit terminal 1S and body ground ― Between Bluetooth unit terminal 1T and body ground • Can B+ voltage be measured? Note • If a short to power supply other than the B+ power supply has occurred, a constant voltage other than B+ can be measured. | Yes | Go to the next step.
No | Go to Step 7.
5 | DETERMINE IF SHORT TO POWER SUPPLY IS OCCURRING IN AUDIO UNIT • Turn the ignition switch to the OFF position. • Disconnect the negative battery cable. • Remove the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.) • Disconnect the audio unit connector. • Connect the negative battery cable. • Turn the ignition switch to the ON position. • Measure the voltage between the following terminals: ― Audio unit connector (vehicle wiring harness) terminal 2I and body ground ― Audio unit connector (vehicle wiring harness) terminal 2J and body ground • Can B+ voltage be measured? Note • If a short to power supply other than the B+ power supply has occurred, a constant voltage other than B+ can be measured. | Yes | Go to the next step.
No | Replace the audio unit because there is a short to the power supply in the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.) After replacement, go to Step 13.
6 | DETERMINE IF SHORT TO POWER IS OCCURRING IN BLUETOOTH UNIT • Turn the ignition switch to the OFF position. • Disconnect the negative battery cable. • Remove the Bluetooth unit. (See Bluetooth UNIT REMOVAL/INSTALLATION.) • Disconnect the Bluetooth unit connector. • Connect the negative battery cable. • Turn the ignition switch to the ON position. • Measure the voltage between the following terminals: ― Audio unit connector (vehicle wiring harness) terminal 2I and body ground ― Audio unit connector (vehicle wiring harness) terminal 2J and body ground • Can B+ voltage be measured? Note • If a short to power supply other than the B+ power supply has occurred, a constant voltage other than B+ can be measured. | Yes | 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.
No | Replace the Bluetooth unit because there is a short to the power supply in the Bluetooth unit. (See Bluetooth UNIT REMOVAL/INSTALLATION.) After replacement, go to Step 13.
7 | INSPECT FOR SHORT TO GROUND IN CAN CIRCUIT • Turn the ignition switch to the OFF position. • Disconnect the negative battery cable. • Inspect for continuity between the following terminals: ― Between Bluetooth unit terminal S and body ground ― Between Bluetooth unit terminal T and body ground • Is there continuity? | Yes | Go to the next step.
No | Go to Step 10.
8 | DETERMINE IF SHORT TO GROUND IS OCCURRING IN AUDIO UNIT • Remove the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.) • Disconnect the audio unit connector. • Inspect for continuity between the following terminals: ― Audio unit connector (vehicle wiring harness) terminal 2I and body ground ― Audio unit connector (vehicle wiring harness) terminal 2J and body ground • Is there continuity? | Yes | Go to the next step.
No | Replace the audio unit because there is a short to ground inside the unit. (See AUDIO UNIT REMOVAL/INSTALLATION.) After replacement, go to Step 13.
9 | DETERMINE IF SHORT TO GROUND IS OCCURRING IN BLUETOOTH UNIT • Remove the Bluetooth unit. (See Bluetooth UNIT REMOVAL/INSTALLATION.) • Disconnect the Bluetooth unit connector. • Inspect for continuity between the following terminals: ― Audio unit connector (vehicle wiring harness) terminal 2I and body ground ― Audio unit connector (vehicle wiring harness) terminal 2J and body ground • Is there continuity? | Yes | 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.
No | Replace the Bluetooth unit because there is a short to ground inside the unit. (See Bluetooth UNIT REMOVAL/INSTALLATION.) After replacement, go to Step 13.
10 | INSPECT CAN CIRCUIT FOR OPEN CIRCUIT • Remove the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.) • Disconnect the audio unit connector. • Remove the Bluetooth unit. (See Bluetooth UNIT REMOVAL/INSTALLATION.) • Disconnect the Bluetooth unit connector. • Inspect for continuity between the following terminals: ― Inspect the wiring harness for continuity between Bluetooth unit connector (vehicle wiring harness side) terminal S and audio unit connector (vehicle wiring harness side) terminal 2I. ― Inspect the wiring harness for continuity between Bluetooth unit connector (vehicle wiring harness side) terminal T and audio unit connector (vehicle wiring harness side) terminal 2J. • Is there continuity? | Yes | Go to the next step.
No | Go to Step 13.
11 | INSPECT AUDIO UNIT RESISTANCE • Inspect the resistance between the audio unit terminal 2I and terminal 2J (part side). • Is the resistance 118―130 Ω? | Yes | Go to the next step.
No | Replace the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.) After replacement, go to Step 13.
12 | INSPECT BLUETOOTH UNIT RESISTANCE • Inspect the resistance between Bluetooth unit terminals S and T (part side). • Is the resistance 118―130 Ω? | Yes | Go to the next step.
No | Replace the Bluetooth unit. (See Bluetooth UNIT REMOVAL/INSTALLATION.) After replacement, go to the next step.
13 | VERIFY THAT REPAIRS HAVE BEEN COMPLETED • Connect all the connectors. • Perform an inspection of the Bluetooth unit DTCs. (See STARTING PROCEDURE FOR ON-BOARD DIAGNOSTIC TEST MODE [Bluetooth SYSTEM (HANDS-FREE TELEPHONE (HF/TEL) SYSTEM)].) • Is the same DTC displayed? | Yes | Return to Step 1 and inspect for other possible causes. If the malfunction recurs, replace the Bluetooth unit, then go to the next step. (See Bluetooth UNIT REMOVAL/INSTALLATION.)
No | Go to the next step.
14 | VERIFY IF OTHER DTCs DISPLAYED • Are any other DTCs displayed? | Yes | Repair the malfunctioning part according to the applicable DTC troubleshooting.
No | DTC troubleshooting completed.