Honda Backup Sensors 08V67-SHJ-1000-81 Owner's Manual page 15

Troubleshooting
Troubleshooting With Beeps
When you turn the ignition switch to ON (II), and the
backup sensor signal sounds more than once, there
may be a problem with one of the sensors.
Corner Sensors
Two slow beeps: right sensor is faulty.
Three slow beeps: left sensor is faulty.
Four slow beeps: right and left sensors are faulty.
Center Sensors
Three fast beeps: one or both sensors are faulty.
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