Metra ASWC connection hookup for 4th Gen 4R's in PLAIN ENGLISH

sgtcombatusmc · 2012-03-21T03:49:01+00:00

Okay, after much fighting, cursing, and one defective module - I finally got my stereo to recognize the steering wheel controls. No thanks to Metra, or their AXXESS interface website, or the PDF they give you, or the application guide. So I'm going to walk you through it step by step. I'm presuming you've already got the dash torn apart, the negative battery cable removed, etc.) Step 1. Connect the red wire (Pin 12) to an ignition controlled voltage source. I simply connected it in parallel with my HU. Step 2. Locate the wire harness for the steering wheel control. (It's the remaining harness after you connect your wire harness up (I used the Metra version) You're interested in 3 wires off of this harness, and 3 wires only. White with Red (Pin 6) Violet with white (Pin 7) Yellow with black (Pin 8) Now for the connections. Step 2a. Connect the black wire (Pin 6) to the white with red wire. (I used T Taps on all of my connections so that I wasn't hacking up the wire harness.) This is your ground, so make sure it's good and solid. Step 2b. Connect the Green with Orange wire (located on Pin 4 of the ASWC plug) to the violet with white wire. Step 2c. Connect the black with green wire (located on pin 8) to the yellow with black wire. Step 3. (This may not apply for your deck, but it does for my Sony 770) connect the 3.5mm plug into the back of your HU, it's labeled "Remote In" Step 4. Cut back or tape off all of the unused wires. Step 5. Plug the ASWC controller box into the wiring harness. Check (and if necessary reconnect) the wire harness to the Toyota's wiring harness and to the stereo. Reconnect the battery terminal. Step 6. Start the car. The ASWC is going to start blinking rapidly, then a bit slower, it should pause on blink 4, 6, and 8, as it's identifying that these wires are connected, and then blink a certain number of times for your particular HU (In my case 4 blinks for a sony) , and finally the light will become solid. You should now have the ability to use your steering wheel controls. (Note: I only have the left side steering wheel controls. But so far, I have full functionality to the HU with them . I cannot attest for what functionality (if any) you'll have with the right side steering wheel controls.) If the light doesn't go solid, it just stays blinking - then the likely culprit is one of your connections isn't solid. Break out the trusty ohm meter, and check them. Then resolder, recrimp, and repeat until you get the desired results. If the light doesn't come on at all - verify you have 12vdc to the pin side of the ASWC. If you do, and you still have no light - open up the little cover on the box, and check the voltage between the two outermost pins. It should be 5vDC. If not, your ASWC is defective, time to dig out the receipt and take it back. Hopefully this helps some of you out there, as I know reading this forum has helped me.

Thread starter sgtcombatusmc
Start date Mar 21, 2012

rhoadeswr

New member

Dec 11, 2023

I just installed my BOSS Audio HU and this is the 10th stereo I’ve installed and out of all of those
I’ved never been able to get the SWC’s
To work no thanks to the crappy instructions AXXESS provides. I’ll take it back out tommorow and try your instructions. Greatly appreciated. You are a lifesaver!