A4 Sedan L4-1.8L Turbo (AEB) (1997)
Ultrasonic Sensor: Service and Repair
Corrective Repair Steps
If malfunctions occur to Ultrasonic Interior Monitoring system, repair as follows:
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Check switch deactivation. See: Testing and Inspection
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Check wiring See Wiring Diagram Troubleshooting and Component Location.
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Perform interior monitor diagnosis. See: Testing and Inspection
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Evaluate diagnosis according to diagnostic table, refer to "Interior Monitoring, Diagnosis" See: Testing and Inspection and repair accordingly.
Sensors, replacing
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Replace sensors. See: Interior Monitoring Sensors, Removing/Installing
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Visually inspect for irregularities (e.g. connections).
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Replace sensors - do not install B pillar trim.
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Perform diagnosis. Refer to "Interior Monitoring, Diagnosis". See: Testing and Inspection
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To check function refer to "Interior Monitoring, Functional Check". See: Testing and Inspection
Removed sensors, diagnosis
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Reinstall one used sensor.
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Perform diagnosis. Refer to "Interior Monitoring, Diagnosis". See: Testing and Inspection
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To check function refer to "Interior Monitoring, Functional Check". See: Testing and Inspection
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Reinstall second used sensor.
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Perform diagnosis. Refer to "Interior Monitoring, Diagnosis". See: Testing and Inspection
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To check function refer to "Interior Monitoring, Functional Check". See: Testing and Inspection
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Based on test results, replace sensors (s) if necessary.
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Install sensors and B pillar trim.
If both tests show a malfunction replace Control Module. See: Interior Monitoring Control Module, Removing/Installing
Control Module, removing
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Remove Control Module. See: Interior Monitoring Control Module, Removing/Installing
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Install new Control module.
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To diagnose refer to "Interior Monitoring, Diagnosis". See: Testing and Inspection
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To check function refer to "Interior Monitoring, Functional Check". See: Testing and Inspection
If both tests are not OK, check wiring according to latest Wiring Diagram:
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Terminal assignments for Control Module Connector, See: Accessories and Optional Equipment/Antitheft and Alarm
Systems/Locations/Connector Locations
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Terminal assignments for sensor connector, See: Accessories and Optional Equipment/Antitheft and Alarm Systems/Locations/Connector
Locations
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Repair wiring.
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To diagnose, refer to "Interior Monitoring, Diagnosis". See: Testing and Inspection
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To check function refer to "Interior Monitoring, Functional Check". See: Testing and Inspection