Question about Pioneer GM-7100M Car Audio Amplifier

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Deh-9300 remote on wire ground

The "remote on" wire for amp from head unit indicates that it is grounded. Is this normal for this wire when the head unit is OFF? However, its still shows ground when head unit is on. Possible bad head unit? Everything else with the head unit is working, amp will not come on using head remote on, however, it comes on when jumpered. Verified head unit is configured for sub-woofer mode (power on).

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There is an internal relay that switches the amplifier remote turn on from ground to 12VDC when the ignition (ACC) wire is applied power.

The internal relay (inside the radio) is faulty and must be repaired.

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Posted on Apr 30, 2010

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Posted on Jan 02, 2017

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1 Answer

My amp doesn't turn on but all wires are plugged in. I tested it right before I bought it, it's grounded to a bolt in the chasis. What could be wrong?


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The remote wire DOES need to be connected to the head unit. You can see if thats the problem simply by touching the remote wire to the power wire. The unit should come on. The head unit should either have a remote lead, or a power antenna lead, and thats what you need to turn the amp on and off. BE SURE your ground is solid, and its usually best to take that to the battery as well to prevent unwanted engine noise. Hope this helps!

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With these units, the internal amplifier is an IC that fails sometimes. It can leave the rest of the unit working ok, bit will have no audio. There may be audio from the line level RCA's but not from the speaker outs. Smell the back of the unit to see if it smells burnt. Most of the time it will, but not always. The IC is usually something like a PAL007a or similar. If you are good at soldering, you can order the part, and change it yourself. If not, you will need to seek a technician to replace the part. You may also try an external amplifier and RCA's instead of fixing the IC.

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The amp needs a remote signal to turn on. This is provided by wire from the back of your head unit. Also look for a 'REM' or 'remote' connection on the amp (besides the 12v and ground connection).

Look at the wiring/setup diagram for your head unit to determine which wire/connection you should use for this.

If the head unit does not have a specific 'remote' wire, you can usually use the power antenna wire to provide a turn on signal to the amp instead.

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when cut off amp if you still here the humming this can be an indicator of low power being produced by alternator alternators produce 14 anything below 12 would mean replacement of alternator

if alternator fine then you need to find new ground for amp and make sure you have a good ground for sterio this can be checked with a test light
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if pulsing in test light on the ground means you have a bad ground
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I had the same problem with my Pioneer Head Unit.

I changed the ground of the Head Unit and the AMP to the same location and that took care of the Alternator noise.




Best of Luck.

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