Buzzing Noise at Rear Speakers 2007 Tahoe/Suburban

[Manuux96]

Hello everyone,

I’m reaching out from Germany because the community for Suburbans, Tahoes, and Yukons is quite small here. I drive a 2007 Suburban, which is essentially the same as the Tahoe and Yukon, just a bit longer.

I bought the car with an aftermarket radio already installed by the previous owner, and I've been having issues with the sound system ever since. When I turn on the rear seat audio (RSA) controller, the speakers produce a buzzing and humming noise, and the sound is very faint. When I turn off the RSA, the buzzing stops. When the engine speed increases, the noise does not change but remains constant.

I’m trying to troubleshoot without buying a new RSA unit because the shipping costs to Germany are very high. I’d like to know which pins on the connector need to be bridged to bypass the RSA and see if the buzzing comes from the RSA or my CANBUS adapter (PAC RP5-GM31).

Has anyone dealt with a similar issue or can provide a pinout for the RSA connector? Any advice would be greatly appreciated!

Thank you in advance!

 

[Tahoe14]

@Doubeleive

 

[Doubeleive]

Hello everyone,

I’m reaching out from Germany because the community for Suburbans, Tahoes, and Yukons is quite small here. I drive a 2007 Suburban, which is essentially the same as the Tahoe and Yukon, just a bit longer.

I bought the car with an aftermarket radio already installed by the previous owner, and I've been having issues with the sound system ever since. When I turn on the rear seat audio (RSA) controller, the speakers produce a buzzing and humming noise, and the sound is very faint. When I turn off the RSA, the buzzing stops. When the engine speed increases, the noise does not change but remains constant.

I’m trying to troubleshoot without buying a new RSA unit because the shipping costs to Germany are very high. I’d like to know which pins on the connector need to be bridged to bypass the RSA and see if the buzzing comes from the RSA or my CANBUS adapter (PAC RP5-GM31).

Has anyone dealt with a similar issue or can provide a pinout for the RSA connector? Any advice would be greatly appreciated!

Thank you in advance!

I do not know the pinout but you can probably find it in the GM upfitter guide (full size electrical)

Light Duty Prior To 2013 - GM Upfitter

www.gmupfitter.com

 

[Joseph Garcia]

Welcome to the Forum from USA.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving sage advice from the knowledgeable folks on this Forum.

 

[Manuux96]

I do not know the pinout but you can probably find it in the GM upfitter guide (full size electrical)

Light Duty Prior To 2013 - GM Upfitter

www.gmupfitter.com

Thank you!
The green plug of the radio control must be bridged from top to bottom to bypass this. Unfortunately, that did not solve the problem and the humming also occurs with the radio unit bridged. So my guess is that the Bose amplifier has a bad ground connection, the amplifier is defective or a speaker is short-circuited.

 

[Manuux96]

Welcome to the Forum from USA.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving sage advice from the knowledgeable folks on this Forum.

Thank you for the good reception here!

I have attached some pictures. There are a few things that need to be modified in order to be allowed to drive an american car in Germany.

 

[Doubeleive]

Thank you!
The green plug of the radio control must be bridged from top to bottom to bypass this. Unfortunately, that did not solve the problem and the humming also occurs with the radio unit bridged. So my guess is that the Bose amplifier has a bad ground connection, the amplifier is defective or a speaker is short-circuited.

I could be wrong but I think some have reported that the rear control could be the issue (making noise), you might try searching around a bit to confirm or deny

 

[Manuux96]

I could be wrong but I think some have reported that the rear control could be the issue (making noise), you might try searching around a bit to confirm or deny

I disconnected the rear control and bridged the cables of the plugs, so I bypass the rear control

 

[Doubeleive]

I disconnected the rear control and bridged the cables of the plugs, so I bypass the rear control

did that solve the problem? if not if you have a capable scanner you can test the amp channels, this will create a tone on each channel, not sure if the noise would be present or not but if it is then that may confirm if it is the amp or not.
maybe also you could try to switch the input signal for that channel and see if the problem follows the input, if so that would make the problem the head unit.

 

[Manuux96]

did that solve the problem? if not if you have a capable scanner you can test the amp channels, this will create a tone on each channel, not sure if the noise would be present or not but if it is then that may confirm if it is the amp or not.
maybe also you could try to switch the input signal for that channel and see if the problem follows the input, if so that would make the problem the head unit.

No, the noise also comes when the plug is bridged. It doesn't matter which channel is set on the radio. The front speakers work perfectly, but the sound from the rear is very quiet and the loud noise comes from all rear speakers.

what kind of tester do I need? Unfortunately, there is no information about this in Germany