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1
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VERIFY PCM DTCs
• Retrieve the PCM DTCs using the M-MDS.
• Is the DTC 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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Go to the next step.
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2
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INSPECT BATTERY
• Is the battery normal?
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Yes
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Go to the next step.
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No
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Recharge or replace the battery, then go to Step 11.
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3
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INSPECT GENERATOR
• Is the generator normal?
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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 generator, then go to Step 11.
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4
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INSPECT IGNITION RELAY (ACC_STAB)
• Switch the ignition off.
• Disconnect the negative battery cable.
• Remove the ignition relay (ACC_STAB).
• Inspect ignition relay (ACC_STAB).
• Is the ignition relay (ACC_STAB) normal?
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Yes
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Go to the next step.
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No
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Repair or replace the ignition relay (ACC_STAB), then go to Step 11.
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5
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INSPECT AUDIO AMPLIFIER CONNECTOR CONDITION
• Disconnect the audio amplifier connector.
• Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
• Is the connector normal?
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Yes
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Go to the next step.
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No
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Repair or replace the connector, then go to Step 11.
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6
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INSPECT POWER SUPPLY CIRCUIT OF AUDIO AMPLIFIER FOR MALFUNCTION
• Verify that the ignition relay (ACC_STAB) is removed.
• Verify that the audio amplifier is disconnected.
• Connect the negative battery cable.
• Switch the ignition ON (engine off or on).
• Measure the voltage at the following terminals (wiring harness-side):
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― Ignition relay (ACC_STAB) terminal C
― Audio amplifier terminal 3A
• Is the voltage B+?
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Yes
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Go to the next step.
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No
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Inspect the AUDIO2 7.5 A fuse and BOSE 25 A fuse.
• Any fuse is blown:
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― Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
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• AUDIO2 7.5 A fuse—Ignition relay (ACC_STAB) terminal C
• BOSE 25 A fuse—Audio amplifier terminal 3A
If there is a common connector:
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• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
• Repair or replace the malfunctioning part.
If there is no common connector:
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• Repair or replace the wiring harness which has a short to ground.
• Replace the fuse.
• Any fuse is damaged:
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― Replace the fuse.
• All fuses are normal:
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― Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
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• DC-DC converter terminal K—Ignition relay (ACC_STAB) terminal C
• DC-DC converter terminal K—Audio amplifier terminal 3A
If there is a common connector:
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• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
• Repair or replace the malfunctioning part.
If there is no common connector:
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• Repair or replace the wiring harness which has an open circuit.
Go to Step 11.
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7
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INSPECT DC-DC CONVERTER CONNECTOR CONDITION
• Switch the ignition off.
• Disconnect the negative battery cable.
• Disconnect the DC-DC converter connector.
• Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection.
• Is the connector normal?
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Yes
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Go to the next step.
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No
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Repair or replace the connector, then go to Step 11.
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8
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INSPECT DC-DC CONVERTER
• Inspect the DC-DC converter.
• Is the DC-DC converter normal?
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Yes
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Go to the next step.
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No
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Repair or replace the DC-DC converter and go to Step 11.
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9
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INSPECT BETWEEN IGNITION RELAY AND AUDIO UNI FOR SHORT TO GROUND
• Verify that the ignition relay (ACC_STAB) is removed.
• Verify that the audio amplifier is disconnected.
• Inspect for continuity between ignition relay (ACC_STAB) terminal D (wiring harness-side) and body ground.
• Is there continuity?
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Yes
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Refer to the wiring diagram and verify if there is a common connector between Ignition relay (ACC_STAB) terminal D and audio amplifier terminal 2D.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to ground.
Go to Step 11.
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No
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Go to the next step.
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10
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INSPECT BETWEEN IGNITION RELAY AND AUDIO UNI FOR OPEN CIRCUIT
• Verify that the ignition relay (ACC_STAB) is removed.
• Verify that the audio amplifier is disconnected.
• Inspect for continuity between ignition relay (ACC_STAB) terminal D (wiring harness-side) and audio amplifier terminal 2D (wiring harness-side).
• 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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Refer to the wiring diagram and verify if there is a common connector between Ignition relay (ACC_STAB) terminal D and audio amplifier terminal 2D.
If there is a common connector:
• Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
• Repair or replace the malfunctioning part.
If there is no common connector:
• Repair or replace the wiring harness which has a short to ground.
Go to the next step.
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11
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VERIFY THAT REPAIRS HAVE BEEN COMPLETED
• Always reconnect all disconnected connectors.
• Connect the negative battery cable.
• Clear the audio amplifier DTCs.
• Switch the ignition ON (engine off or on) and wait for 5 s or more.
• Retrieve the audio amplifier DTCs using the M-MDS.
• Is the same DTC displayed?
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Yes
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Repeat the inspection from Step 1.
• If the malfunction recurs, replace the audio amplifier.
Go to the next step.
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No
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Go to the next step.
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12
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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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