Master warning, airbag, yellow brake and VSC lights comes up

What is the accident history on this car?

I suggest that you have your local Toyota dealer retrieve the DTC on the car. With those warning lights on, it is guaranteed that DTC have been logged by the skid control and SRS ECUs (which a generic scan tool will not retrieve.)

 

It is very likely that the airbag light is related to the accident and incomplete repairs. Maybe another airbag fired and was not replaced correctly (driver's seat airbag or side curtain airbag, for example). Once you have the SRS ECU DTC then you'll have a better idea about that problem.

Regarding the VSC and yellow brake light, this shows you that the brake system is impaired. You'll need the DTC logged by the skid control ECU to pin this down further. This problem might or might not be related to accident damage.

 

Recently I had a small airbag light issue during the repairs to
AMAPOLA being rear-ended about a month ago. It may have
relevance here.

The air bags had not deployed. Immediately after the accident, I
noticed that the main airbag light in the center of the dash was
illuminated and the passenger side light said "OFF," despite there
being a person sitting there. The car appeared to operate normally
when I drove home, ~eight miles. My ScanGauge did not show any
"thrown" codes."

After talking to my insurance carrier, I took the car into the shop the
next day.

When I went to pick up my car after repairs were "completed," I
noticed that the lights were still in the immediate post accident
condition. ALL STOP! I checked my Owner's Manual and it said the
car sould be taken to a Toyota dealer immediately. I reported the
same to the body shop and refused to accept the car. They "would get
right on it," even though there was some noticeable concern on their
part that the condition might not be related to the accident!

The next day the car was reported ready to pick up again, with no air
bag warnings illuminated. I found that to be true. I asked what they
had done by way of correction.

The repair shop had driven the car to the nearest Toyota dealership,
about five miles distant. There the techs had read out a "stored
collision code" in whatever ECU controls the passenger side air bag. It
was then cleared.

So, if I got a true story, apparently the code is routinely logged and
the warnings illuminated at some force/acceleration level below the
air bag activation level. It might just be Toyota covering it's butt, but
then again, it might be a meaningful reminder to prudent operators to
have the car checked over after a non-air bag activating incident.

I suspect that the illuminated air bag lights could very well be "left
over" from the earlier accident.

 

I can't say for sure. I think it did. In my minds eye I can see
it on with the airbag lights. But then, I've had it come on at other times
when I tried to drive with the driver's door not fully closed, which I may
have tried to do after the accident.

Given the complexity of the HSD's operating algorithms, this wouldn't
surprise me. But I would question whether the lights are triggered by
time, distance travelled, or as the result of some lengthy string of error
finding routines involving both time and distance. Perhaps it might
even be the result of the HSD relearning something after "losing it's
memory" due no 12V power. I'm not sufficiently HSD smart myself to
say.

 

There's really no problem disconnecting the 12V battery, as you've learned from your own experience.

What mpg is the car logging? I wonder if the car is relying solely on friction braking (and not regen).

The logic associated with turning on the warning lights can be complex, and may require certain operating parameters to be achieved before the lights will come on (like the problem happening twice, or subject to operating temp being achieved, etc.)

Regarding reading the skid control ECU and SRS ECU DTC, it is possible to retrieve and clear blink codes by shorting terminals 4 and 13 within the DLC3 connector. I've previously posted on this, and you can also download Toyota repair manual info at techinfo.toyota.com to obtain the specifics regarding how to do this and what the various blink codes mean. However if other ECUs have logged DTC you will not be able to retrieve those DTC via blink codes.

 

Re: Master warning, airbag lights comes up

[FONT=&quot]Similar SRS Airbag light illuminates and causing breaks to grab or slip/slight accelerate at VERY slow speeds 1 mph down to 0 mph. Jerky brake grab at the final transition to stop. [/FONT]
[FONT=&quot]
[/FONT]
[FONT=&quot]I can temporally reset the light (turn it off): by disconnecting/then reconnecting all three connectors under the driver seat while the key is not in the ignition. I might get five to twenty miles of proper brake performance from the car until during driving the SRS airbag red dash warning light again illuminates. New 12V battery in place. [/FONT]

[FONT=&quot]Air bag warning light 1st appeared around these events: [/FONT]

1. [FONT=&quot]Very low battery voltage output (11 then down to 9.3V) – battery now replaced[/FONT]
2. [FONT=&quot]Small impact with a curb drivers side tire went flat/no rim damage [/FONT]

[FONT=&quot]a. [/FONT][FONT=&quot]Replaced the front tire w/same size/different brand possible slight tire size imbalance?[/FONT]
[FONT=&quot]
[/FONT]
[FONT=&quot]3. [/FONT][FONT=&quot]Creaking sound in right front brake. Suspect lack of lube on brake slide - Pads replaced/rotors turned[/FONT][FONT=&quot]

4. [/FONT][FONT=&quot]Reoccurring SRS bag light illuminated just after temporary loss of full engine power while driving (I thought I had a temporary fuel delivery problem). Chugged a bit and then drove fine except for the re-illuminated SRS warning light[/FONT]
[FONT=&quot]Anyone have an idea where this evidence points?[/FONT]
[FONT=&quot]
[/FONT]
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Kmun, if you feel comfortable, you can try following the procedure shown in the video linked below, then post the flash codes here to be interpreted.

It is possible that the curb check disrupted the wiring to one of the front collision sensors and has caused an intermittent problem.

http://priuschat.com/forums/gen-ii-...shes-dlc-jumper-wire-does-procedure-work.html