Techstream Error: S303-05 ABS/VSC/TRAC can't connect

Hi all, I've been reading the forum but can't find the answers I'm looking for so I'm reaching out.

Vehicle: 2nd Gen (2007) Prius
Issue: ABS brake actuator, techstream won't connect, ABS alarm/chime going off

1. replaced the ABS actuator with a used one from a junk yard.
2. plugged in the hybrd battery and connected the 12V battery. In diagnostic mode, 12V battery shows 14V.
3. Dashboard shows all the error lights - Brake, VSC, ABS
4. Turned the car off and air bled the brakes with a broom stick holding the pedal down.
5. ABS pump was running and pumping out fluid. I kept it topped up while bleeding the brakes in this order - RR, LF, LR, RF
6. Dashboard still showing lights after bleeding. I pumped the brakes about 30 times while holding down power. Brakes were working but still showing dashboard error lights.
7. put paperclip in slots 4 and 13 of the OBDII connector, went to diagnostic mode, restarted, and the dashboard error lights were gone.

I drove it around and the brakes seemed fine. The next day, I got a cable from Amazon like the one from the ih8mud page. When I opened the car door, I heard the loud alarm/chime. Turned on the car and didn't see dashboard errors but did hear some pumping noise from the ABS unit. I connected the mini vci cable and it connected to the car. I was able to connect to the engine and see diagnostics but not the ABS/VSC/TRAC section of diagnostics.

I drove it around some more and kept hearing the alarm/chime. Once when backing up out of a parking space, the brakes didn't seem like they were going to stop the car!

My assumption at this point is that the cable is bad and can't connect to the ABS/VSC/TRAC portion of diagnostics or the used ABS unit is bad and the diagnostic software can't connect. Maybe there is something else I'm missing?

If the cable had connected, I would have followed the techstream brake bleeding sequence. At that point, I think I'd be able to determine if the ABS unit was bad or not.

 

Thanks, Tombukt2, I'll look into the cable. It's frustrating because the cable I have seems to work for other diagnostic systems, just not the ABS/VSC/TRAC portion.

 

Thanks @mr_guy_mann and @MAX2 . Sorry for the delay, had some other unrelated things come up.

I tried to post a link to an image in the first post but it wouldn't let me. I'll try again.

 

ABS ecu - is that the same as the skid control ecu inside the car? (From another post here...)

When I try to do a health check on ABS/VSC/TRAC, it shows a little popup that says, "Selected System is not responding or not available. Please check the repair manual for applicable systems."

There is an asterisk before, *ABC/VSC/TRAC, in the cell.

I haven't clicked through all of them, but Engine and ECT, Hybrid Control, HV Battery, were all loading.