I installed an aftermarket system in a 2006 Honda Accord, everything works except for this Buzzing Noise. I tried every remedy in the book but couldn't get rid of this noise.
The noise only comes when the key is in the ignition position (with or without engine running doesn't matter). So, if the key has three positions: A, B and C is starting the car after which it returns to B, whatever it's called. The noise only appears in this B position or when the engine is On. The noise goes away when the key is in A position and the music sounds PERFECT and CLEAN! As soon as I put it in position B when all the dash light symbols show up, the noise comes back.
Headunit is Alpine 172BT with 3 sets of 4v RCA, Amplifier is Helix H400X class A/B 4 Channel Amplifier. The RCA is Stinger, Speaker Wires are Silver Tinned OFC NVX, Speakers are JBL Component Speakers in the front, coaxials in the back, Power Cables are all oversized OFC NVX cables.
Here're some of the steps I took:
I would greatly appreciate any input.
The noise only comes when the key is in the ignition position (with or without engine running doesn't matter). So, if the key has three positions: A, B and C is starting the car after which it returns to B, whatever it's called. The noise only appears in this B position or when the engine is On. The noise goes away when the key is in A position and the music sounds PERFECT and CLEAN! As soon as I put it in position B when all the dash light symbols show up, the noise comes back.
Headunit is Alpine 172BT with 3 sets of 4v RCA, Amplifier is Helix H400X class A/B 4 Channel Amplifier. The RCA is Stinger, Speaker Wires are Silver Tinned OFC NVX, Speakers are JBL Component Speakers in the front, coaxials in the back, Power Cables are all oversized OFC NVX cables.
Here're some of the steps I took:
- The 4 channel RCA is high quality shielded Stinger cable, and routed to the trunk from the opposite side where the power cables are.
- All cables are OFC Copper.
- All Grounding points have been sanded down.
- Tried different grounding points for the Headunit: Didn't work.
- I tried to use a pair of PAC (PAC CSS12) ground noise isolators on both yellow and red wires going to the headunit : Didn't work.
- Disconnected the Antenna: Didn't work.
- I replaced the Battery Ground cable with a heavy duty cable, cleaned the grounding points, the wires are properly crimped and additionally soldered.
- If I remove the RCA from the Amp, the noise goes away from that channel.
- I can turn this buzzing noise up and down using the amp level set knobs.
- The headunit volume control has no effect on this noise.
- Changing the Source to USB, Radio, BLE etc has no effect on the noise.
- Disconnected other amps and ran only the 4 channel amp: Didn't work.
- I tried grounding the RCA at the headunit - Didn't work.
- I tried grounding the RCA at the amplifier - Didn't work.
- I tried grounding headunit chassis- Didn't work.
- I tried grounding amplifier chassis- Didn't work.
I would greatly appreciate any input.
Attachments
Last edited: