Backup alarm not working - Cars & Trucks

Unhooking your battery should disable your alarm if there is no battery backup inside the alarm itself... but if there is then take out the backup battery first then car battery

Good Luck!

Ford Reverse Backup Sensor not working - YouTube

? 2:11
https://www.youtube.com/watch?v=uf4RbK9f1ko
Oct 26, 2013 - Uploaded by MOSES CALI
Ford Expedition. Parking sensor not working. Diagnoses works for most car makers.

Troubleshooting Backup Sensors - YouTube

? 8:30
https://www.youtube.com/watch?v=_ZLutliglds
Aug 15, 2014 - Uploaded by DeathScouter
Troubleshooting and replacing backup sensors on a 2006 Ford F250 truck, but information is ... Offered up an aftermarket back up camera for $150 in place of repairing the factory system. ...The backup alarm did not work.

You could get a 12 V sonalert from supply house like Newark:

MALLORY SONALERT SC628 TRANSDUCER PIEZO 2 9KHZ 80DBA 28VDC
it's $20 and works from 6 to 28 VDC.
Just wire it to the car's backup lights and you're set.

MALLORY SONALERT SC628 TRANSDUCER PIEZO 2 9KHZ 80DBA 28VDC

Remove alarm check for proper operation with voltage from battery .
if defective replace, if operating check for other wiring problems such as corroded connectors or broken wires.

First, check if the backup lights come on when in reverse.
If so, you can eliminate the switch.
Next up is a fuse, the unit itself, or a loose/disconnected/broken wire.

Have you checked your backup battery to see if it is dead? Your owners manual will show you where this is located. A bad backup battery can trip your alarm with no warning.

2 possible reasons. 1 is that the alarm is not able to function correctly with voltage that is too low. 2 is that the battery theft part of alarm is being triggered. This alarm is not factory OEM.

These type of alarms used to have a secondary battery that powered the alarm solely (small battery, usually in same housing as alarm). It is possible that the backup battery has failed.

Alternatively, you can have a mechanic or technician wire in a small sealed battery to the alarm that is connected to the main battery through a diode. That way, the backup battery will be charged off alternator, but will not discharge except through the alarm. In any case, even the backup battery will fail eventually and you back to same problem.

try replacing the reverse light bulbs with regular ones. alot of the application have a little speaker built onto the bulb. hope this helps