Does anyone know which wires on the head unit's wiring harness are for: switched power (ACC), constant power (BATT) & ground??? Please see my post below explaining:
FX35 - Radio Connectors
FX35 - Radio Connectors
ACC, Batt & Ground wires on HU
- Thread starter kahlilj
- Start date
Did you try a voltmeter at the other pins? Could it be that the pins are mislabeled on the diagram that was posted? Reason I ask is because the 2005 FX35 service manual shows the plug in a different orientation that has the middle blank spot at the top. I think that diagram might be showing the pinouts on the radio side and not the harness side. Here are a couple of screenshots I took with both orientations. Hope it helps!
Service manual orientation
Rotated to match the orientation posted
Service manual orientation
Rotated to match the orientation posted
Last edited:
Thanks. That's exactly what the problem was I was looking at the pins in the wrong orientation, but mine also don't appear to exactly match the pin assignments. I measured voltage across what should be the 12V constant & ground and also to switched ign and ground, but could never get 12V with ignition key on or off. I tried other pins and finally located the ground to be on pin 5. I wrote the pinouts for my harness only for those 3.
I also took a pic showing the 3 wires I tapped into. If you look carefully you will see these 3 wires (wht/ blu, lt grn & red/wht) are also not included in a second bundling of the other wires going to the 10 pin connector. As if they were routed from another source?
- 12V+ (BATT or constant) - white with blue stripe
- ACC (switched ign) - light green
- Ground - red with white stripe
I hope this helps others if they come across this.
Now part 2: Getting the MB (Media Bridge) operational:
So after making those connections I had to reinstall the radio to see if the MB works. It did not.
Now my dilemma is having to remove the radio once again and checking my connections to see if anything loosened or disconnected when I reinstalled the radio^Helpful info there. Ok I had a chance to look more at the fsm. Looks like the pinouts on the fsm are on the radio side and not the harness side so your handwritten diagram of the harness above does match.
Below are the wiring colors that I found in the fsm that might help to solve the issue. Looks like some of the wires might be mixed up.
*1: BOSE
*2: Base
Below are the wiring colors that I found in the fsm that might help to solve the issue. Looks like some of the wires might be mixed up.
*1: BOSE
*2: Base
Thanks Mole. I noticed in your wiring table it has pin numbers up to 21? Is that for the same one I'm using (it only has 10)?
Anyway, unit is still not working. I checked the voltage at the MB connector that attaches at the back of the MB device. I got 10.9 volts. Which is kind of odd to me because at the 10 pin connector on the HU radio harness I measured 11.6 volts. So I'm not sure why there is a significant voltage drop like that.
Regardless the MB does not seem to even power on. I say that because when I connect my iTouch to the MB's USB port and turn on the ignition, it does not show a charge indicator, light up or change its state in any way.
I'm going to try to activate the MB today by connecting it to their firmware update program on my laptop.
catch 22 situation now: well I can't update the MB firmware because it's not registered. and I can't register it because the product is not supported or simply don't have the right form to register it anyway. So.. it still is not working. odd thing is I feel that I can get it to work, but am missing something. I've tried changing the dipswitches to every possible combo, but still nothing.
For now I have to move on to the gazillion other things on my plate, but not willing to totally give up on this project.
For now I have to move on to the gazillion other things on my plate, but not willing to totally give up on this project.
Thanks Mole. I appreciate you checking anyway. How do you like the iSimple?
No complaints so far as it seems to be doing its job. I wanted bluetooth streaming for my music so I just attached an adapter and it works perfectly fine.