I have ordered a 11-C0255-US-A radio and am preparing my car (1995 Pontiac Firebird) for the installation. I have some wiring questions:
1) Steering wheel controls: My car uses a variable resistance output wire. The factory steering wheel control has four wires: +12V input, ground, output to radio, and illumination. The 11-C0255-US-A has three wires for input; KEY 1, KEY 2, and SWC ground. I'm going to connect my output wire to KEY 1. My question is do I need to connect the SWC ground to the ground wire from my controls or will it use the radio's ground?
2) Brake input: Does this need a ground signal when the parking brake is applied?
3) Reversing input: Does this need a +12V signal when the car is in reverse?
Thank you.
11-C0255-US-A wiring
11-C0255-US-A wiring
Last edited by 20160203 on Mon Feb 08, 2016 11:59 am, edited 1 time in total.
Pumpkin 11-c0255 USA in a 1995 Pontiac Firebird
Re: 11-C0255-US-A wiring
Hi there
Thank you for your message!
1, yes, please connect the SWC-GND wire to the original car SWC GND wire.
2, yes, this wire is require to be connected with GND wire from the harness. But if you do not connect, it is also no effect. So it depends on you.
3, yes, the reverse wire is for reverse signal detective. You should connect it to the positive pole of the car reverse light. So it only have power to trigger the radio to switch to rear camera function when the reverse lamp light up when you engate the reverse gear of the car.
Regards!
Thank you for your message!
1, yes, please connect the SWC-GND wire to the original car SWC GND wire.
2, yes, this wire is require to be connected with GND wire from the harness. But if you do not connect, it is also no effect. So it depends on you.
3, yes, the reverse wire is for reverse signal detective. You should connect it to the positive pole of the car reverse light. So it only have power to trigger the radio to switch to rear camera function when the reverse lamp light up when you engate the reverse gear of the car.
Regards!
Re: 11-C0255-US-A wiring
Thank you for the update. I think I have figured out how the steering wheel control wiring works:
KEY 1 puts out +5V on a brown wire. It looks for a return on the SWC ground black wire.
My car has a +12V yellow wire that is the reference signal for the SWC.
My car has a blue wire that is the ground signal for the SWC.
I am going to substitute the brown wire for the yellow wire and connect the blue wire to the SWC ground. I have attached a diagram for reference.
KEY 1 puts out +5V on a brown wire. It looks for a return on the SWC ground black wire.
My car has a +12V yellow wire that is the reference signal for the SWC.
My car has a blue wire that is the ground signal for the SWC.
I am going to substitute the brown wire for the yellow wire and connect the blue wire to the SWC ground. I have attached a diagram for reference.
- Pumpkin_Android_to_1995_Firebird_wiring.jpg (303.21 KiB) Viewed 11626 times
Last edited by 20160203 on Mon Feb 08, 2016 2:54 pm, edited 1 time in total.
Pumpkin 11-c0255 USA in a 1995 Pontiac Firebird
Re: 11-C0255-US-A wiring
My wiring has now been tested and works properly for the steering wheel controls.
Pumpkin 11-c0255 USA in a 1995 Pontiac Firebird
11-C0255-US-A steering wheel control wiring
I'll summarize this for anyone that needs help with this wiring:
The KEY 1 and KEY 2 wires each output +5VDC. This is the reference or input signal the radio uses for the SWC. The black wire is the return or ground wire that outputs the reduced voltage when keys are pressed. It is independent of the chassis ground. There are two +5V wires in case your controls have two reference wires (such as left and right controls each with a unique reference wire). My car only had one, so I used KEY 1 and taped off KEY 2.
The goal is to have the KEY 1 (and KEY 2 if you have two input wires) wire go to one side of the SWC and the black wire connected to the other side, this is the side that would go to the factory radio.
This setup worked on my 1995 Pontiac Firebird and should work on any car that uses resistance values for the SWC. It will probably not work on later model CANBUS cars w/o an adapter. It is helpful to have a shop manual or wiring diagram so you know what wires to modify. In my case, I was able to remove the +12V reference wire and substitute the KEY 1 wire, then route the factory output wire to the SWC ground wire.
The KEY 1 and KEY 2 wires each output +5VDC. This is the reference or input signal the radio uses for the SWC. The black wire is the return or ground wire that outputs the reduced voltage when keys are pressed. It is independent of the chassis ground. There are two +5V wires in case your controls have two reference wires (such as left and right controls each with a unique reference wire). My car only had one, so I used KEY 1 and taped off KEY 2.
The goal is to have the KEY 1 (and KEY 2 if you have two input wires) wire go to one side of the SWC and the black wire connected to the other side, this is the side that would go to the factory radio.
This setup worked on my 1995 Pontiac Firebird and should work on any car that uses resistance values for the SWC. It will probably not work on later model CANBUS cars w/o an adapter. It is helpful to have a shop manual or wiring diagram so you know what wires to modify. In my case, I was able to remove the +12V reference wire and substitute the KEY 1 wire, then route the factory output wire to the SWC ground wire.
Pumpkin 11-c0255 USA in a 1995 Pontiac Firebird
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