DTC B1A89:13 [CONNECTIVITY MASTER UNIT]
id0902n7105900
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Description |
DAB antenna feeder circuit malfunction |
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Detection condition
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• The connectivity master unit (CMU) detects an open circuit in DAB antenna feeder circuit with the ignition switched ON (engine off or on).
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Fail-safe
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Not applicable
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Possible cause
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• Tuner and amp unit (TAU) connector or terminal malfunction
• Open circuit in antenna feeder No.2
• Rod antenna malfunction
• Tuner and amp unit (TAU) malfunction
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System wiring diagram
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Not applicable
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Diagnostic Procedure
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Step |
Inspection |
Action |
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1
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INSPECT TUNER AND AMP UNIT (TAU) CONNECTOR CONDITION
• Switch the ignition off.
• Disconnect the negative battery terminal.
• Disconnect the tuner and amp unit (tau) 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 5.
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2
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INSPECT ROD ANTENNA CONNECTOR CONDITION
• Disconnect the rod antenna 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 5.
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3
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INSPECT ANTENNA FEEDER No.2
• Inspect the antenna feeder No.2.
• Is the antenna feeder No.2 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 antenna feeder No.2, then go to Step 5.
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4
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INSPECT ROD ANTENNA
• Inspect the rod antenna.
(See ROD ANTENNA INSPECTION.)
• Is the rod antenna 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 rod antenna, then go to the next step.
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5
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VERIFY THAT REPAIRS HAVE BEEN COMPLETED
• Always reconnect all disconnected connectors.
• Connect the negative battery terminal.
• Clear the DTC for the connectivity master unit (CMU) using the M-MDS.
• Switch the ignition ON (engine off or on) and wait for 7 s or more.
• Retrieve the connectivity master unit (CMU) DTCs using the M-MDS.
• Is the same Pending DTC present?
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Yes
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Repeat the inspection from Step 1.
• If the malfunction recurs, replace the tuner and amp unit (TAU).
Go to the next step.
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No
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Go to the next step.
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6
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VERIFY IF OTHER DTCs DISPLAYED
• Are any other DTCs displayed?
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Yes
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Repair or replace 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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