Question about Pioneer GM-X372 Car Audio Amplifier
Hi i have a Pioneer DEH-4600MP which seems to work fine; however none of the car speakers make any sound regardless of the volume. What does apparently recieve a weak signal is my amp which powers a subwoofer. If I put the volume fairly high (like 35/62, while normal listening volume was maybe 10) I can hear the output from the subwoofer. The amp has a seperate input from regular audio cables (red and black out of deck). This setup worked fine when I purchased the car used, then came and went, and now just works as described above. All connections look fine (main cable bundle, antenna, and RCA cable). Could the deck have a bad internal amp or something? Let me know if any more information would help...thanks!
For the pair that is at 0v, disconnect them from the wires that go to the speakers and re-test them. If they remain at 0v, they IC is defective. If they return to the voltage on the others, check the wiring between the speaker output wires and the speakers. Make sure they're not grounded anywhere.
Posted on Apr 25, 2008
It's possible (probable) that the head unit has a blown internal amplifier IC. Measure the DC voltage on each of the 8 speaker wires on the head unit. Place the black lead on the chassis of the head unit. Probe each wire with the red lead. All should read approximately 1/2 of the voltage on the yellow wire. If you get some that are significantly higher or lower, disconnect all speaker wires from the harness and measure again. If the voltage is still not ~1/2 of the voltage on the yellow wire, the IC is almost certainly defective.
For the external amp, you need to check the shield ground for the head unit. The following page shows you how.
Test RCA shield ground
Posted on Apr 22, 2008
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Posted on Jan 02, 2017
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