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DM720
OPERATION
Problem
Yellow wire not connected or incorrect voltage
Unit will not turn on
Red wire not connected or incorrect voltage
(no power)
Black wire not connected
Fuse blown
Speaker wires not connected
Unit has power
One or more speaker wires touching each
(but no sound)
other or touching chassis ground
Yellow or red wire touching chassis ground
Speaker wires touching chassis ground
Unit blows fuse(s)
Incorrect fuse rating
Parking brake safety circuit not connected
Unit has audio
Parking brake not applied
(but no video)
Reverse circuit not connected
No video display
Vehicle is not in reverse
(when in reverse)
Troubleshooting
General
Cause
Learn more about car stereos we have.
Action
Check connections for proper voltage (11~16VDC)
Check connection to ground
Replace fuse(s)
Check connections at speakers
Insulate all bare speaker wires from each other and
chassis ground
Check for pinched wire
Check for pinched wire
Use fuses with correct rating
Check connections at parking brake
Apply parking brake as described
Check connections at reverse lamp
Select reverse gear
on page 26
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