HELP..C6..Poor FM & Dimmer not working after Kenwood HU install
03-20-2010, 08:13 AM
#1
Burning Brakes
Thread Starter
HELP..C6..Poor FM & Dimmer not working after Kenwood HU install
I just did a clean sweep of the stereo in my C6Z, HU, amp, speakers. I installed a Kenwood DNX5140 HU. The FM reception sucks compared to the stock unit & the dimmer doesn't dim down at night. I believe I have the setting right in the unit & all connection made to the GMCO. I did go from a CD changer to Nav unit.
Any advice would be appreciated.
Thanks, Steve
I think I found the dimmer problem, needs to be hooked the gray wire for the TC......correct ?
Any advice would be appreciated.
Thanks, SteveI think I found the dimmer problem, needs to be hooked the gray wire for the TC......correct ?
Last edited by speedy77; 03-21-2010 at 10:31 AM.
03-20-2010, 09:08 AM
#2
Tech Contributor
Correct for the gray TC dimmer wire 
C6 has a powered antenna module in the rear of the car. It is normally powered by the radio via the same circuit that powers the stock amp. I'm guessing you connected the 'remote amp turn on' from the new HU (blue/white) to your new amp, but didn't also connect it to the blue wire on GMCO (connected to white wire at B3 of the main radio harness). In your situation, I'd connect the 'power antenna' wire from the new HU (blue) to the GMCO blue wire since you only need it to come on when you play the radio. Then make sure the settings on the HU turn on that wire when you play AM/FM (if it can be changed).
C6 radio schematics are available here, check out the antenna schematic.
C6 has a powered antenna module in the rear of the car. It is normally powered by the radio via the same circuit that powers the stock amp. I'm guessing you connected the 'remote amp turn on' from the new HU (blue/white) to your new amp, but didn't also connect it to the blue wire on GMCO (connected to white wire at B3 of the main radio harness). In your situation, I'd connect the 'power antenna' wire from the new HU (blue) to the GMCO blue wire since you only need it to come on when you play the radio. Then make sure the settings on the HU turn on that wire when you play AM/FM (if it can be changed).
C6 radio schematics are available here, check out the antenna schematic.
03-20-2010, 10:30 AM
#3
Burning Brakes
Thread Starter
Correct for the gray TC dimmer wire
C6 has a powered antenna module in the rear of the car. It is normally powered by the radio via the same circuit that powers the stock amp. I'm guessing you connected the 'remote amp turn on' from the new HU (blue/white) to your new amp, but didn't also connect it to the blue wire on GMCO (connected to white wire at B3 of the main radio harness). In your situation, I'd connect the 'power antenna' wire from the new HU (blue) to the GMCO blue wire since you only need it to come on when you play the radio. Then make sure the settings on the HU turn on that wire when you play AM/FM (if it can be changed).
C6 radio schematics are available here, check out the antenna schematic.
C6 has a powered antenna module in the rear of the car. It is normally powered by the radio via the same circuit that powers the stock amp. I'm guessing you connected the 'remote amp turn on' from the new HU (blue/white) to your new amp, but didn't also connect it to the blue wire on GMCO (connected to white wire at B3 of the main radio harness). In your situation, I'd connect the 'power antenna' wire from the new HU (blue) to the GMCO blue wire since you only need it to come on when you play the radio. Then make sure the settings on the HU turn on that wire when you play AM/FM (if it can be changed).
C6 radio schematics are available here, check out the antenna schematic.
Also I have both plugs disconnected at the Bose amp, does that matter ? I tied all the black ground wires together, should them be run to ground ? Thank You !
Last edited by speedy77; 03-20-2010 at 10:39 AM.
03-20-2010, 10:55 AM
#4
Tech Contributor
The stock amp being unplugged won't matter.
The blue gmco wire connects directly to the white wire at B3 of the car harness. That white wire connects directly to the antenna module to power it. If you don't have anything connected to the blue gmco wire, your antenna module is not powered.
Powering the module may not help much, but it will help.
Use the blue antenna power wire from the HU harness on the blue gmco wire and make sure the power antenna settings are correct, that will be as good as the stock antenna can get with an aftermarket HU.
The blue gmco wire connects directly to the white wire at B3 of the car harness. That white wire connects directly to the antenna module to power it. If you don't have anything connected to the blue gmco wire, your antenna module is not powered.
Powering the module may not help much, but it will help.
Use the blue antenna power wire from the HU harness on the blue gmco wire and make sure the power antenna settings are correct, that will be as good as the stock antenna can get with an aftermarket HU.
