Mystery issue with brake lights

Seems like there's something wrong with brake lights or wiring. You don't have a tow hitch in you're car? Or some other modification to tail light wiring? If yes check those connections first. If no mayby check for bad brake lights first.

 

Do the tail lights.....in the same assembly.....work when you turn the headlights ON ?
The classic most common cause of a problem like this was a loose ground wire serving the stop lights.
But I don't know if they depend on frame ground like they used to.

 

check the 12v neg to ground

 

I would check the BN Ground point in the back and the connectors at the lights

 

Starting multiple threads on the same problem is not a good idea. Choose one of your threads to move forward on and link the other threads back to them, or ask a moderator to combine the threads.

 

My brake lights do work. So i am not doing anything yet.
My mechanic says if abs turns on and generally stays on and if you get either c1256 or c1391 then we should replace brake actuator.

my abs,vsc,! indicator turned on and went away 3-4 times and the code has been c1246. My mechanic just cleared the code.

my actuator makes that noise every 20 sec(while not driving) and every 10 sec while driving.

 

Here is the workup for DTC C1246 : https://share.qclt.com/%E4%B8%B0%E7%94%B0%E6%99%AE%E7%91%9E%E6%96%AF%E5%8E%9F%E5%8E%82%E8%8B%B1%E6%96%87%E6%89%8B%E5%86%8Cpdf%E6%A0%BC%E5%BC%8F/repair%20manual/04pruisr/05/21avn/cic12464.pdf

Notice in the above workup for DTC C1246 that there are eleven (11) possible 'detailed codes' (aka sub codes or INFs), knowing the INF for a DTC may save time and money when diagnosing or repairing a problem.

Does the mechanic have a toyota hybrid compatible scanner that can provide the sub code(s) (detailed code or INF) for DTC C1246 ?

 

Sorry. I mistyped. My code has always been c1249 not c1246. It has been checked 2 times now after clearing. But every time the abs, vsc,(!), Brake indicator comes on and goes away after i stop. It comes on again at random usually in the next drive or the one after. The frequency of indicators coming on has increased. In the last 2 months i have had it come on a total of 8 times. But in the last 7 days it has come on 3-4 times. Since c1249 seems non-critical (just a abs feature that i hardly would use in a dry desert) i am not taking any action. The brake lights work like a charm.
Would you do anything different ?

 

Anyone found solution?

I have toyota vitz/yaris 2007, my car shows ABS warning sometimes, mostly when I drive on uneven or rough road. If I turn of engine and start again warning goes away. I have scanned and C1249 error comes. I have done service of brake light switch, got it replaced also but still same.

 

https://attachments.priuschat.com/attachment-files/2020/08/192471_DTC_C1249.pdf

An open circuit can mean wiring.