ABS warning lights

Welcome to Prius Chat .

Some questions:

• How many miles on your Prius?
• Have you had any recent maintenance performed?
• Does the car have a clean history?
• Do you (or the mechanic) you take it to have Techstream software?
• Do you notice any difference in performance since the lights have come on?
• Have you tried disconnecting the 12v battery and seeing if the codes return?

Keep us posted .

 

Couple of things for your next steps:

• That’s awful low mileage, but that can be bad for the traction battery. How long have you owned your Prius?
• How many miles have you put on it?
• Get a 12 volt reading in the battery in the morning of after it has been sitting for awhile. What is that reading?

There are codes there. They will tell you the next steps .

Good luck and keep us posted .

 

Heat is the enemy of batteries .

That short of a drive may not get the battery the frequent use it needs.

Can you post up some pictures of the voltages you are reading?

Keep us posted .

 

I didn’t see a SoC PID, can you add that? Also, the IR PIDs need one more decimal place of precision ideally, if that can be adjusted. Normally they are in the range of 0.019 - 0.032 Ohms. If IR variance is spread, that may indicate a HV battery problem, but otherwise I don’t see anything about which to worry. If they are around 0.024 - 0.026 Ohms, then nothing too serious.

If your scan tool can see the HV battery PIDs then, it should also show the DTCs.

You did not show any HV battery DTCs, so I am thinking your worries are elsewhere.

 

Make the Prius READY, and look at the inverter coolant reservoir. Do you see fluid turbulence in the reservoir? If you do not, the inverter coolant pump has failed (located behind the left headlight assembly. "Left" is from the point of view of the rear of the car, looking towards the front.)

The skid control ECU is guaranteed to have logged DTC given the presence of the warning lights described in your message. However your phone is not able to pick those up.

 

The skid-control ECU has this strangely underappreciated ability to talk to you with light blinks, if you don't have a suitable scan tool to get the codes that way. A short piece of skinny wire is all it takes.

-Chap

 

Time to measure the voltage across the 12V battery, when the car is IG-OFF.

 

ABS: 42 & VSC: 45 don't appear to be valid blink codes for the respective systems. Can you please reconfirm the blink codes for the ABS and VSC?

((!)) (or ECB) codes are C1241, C1242 and C1249 respectively.

I would be focused on the 12 V battery and ensure it is in good condition and fully charged before moving on to other areas.

Detection Item and Trouble Area for the ECB Codes:

	DTC No.	Detection Item	INF Code​	Trouble Area
1	C1241/41	Low Battery Positive Voltage or Abnormally High Battery Positive Voltage	81 82 83 84	ABS NO. 1 relay ABS NO. 2 relay Harness and connector Skid control power supply circuit Brake control power supply assembly Hybrid control system
2	C1242/42	Open in IG1 / IG2 Power Source Circuit	87 88	ABS NO. 1 relay ABS NO. 2 relay Harness and connector Skid control power supply circuit Brake control power supply assembly Hybrid control system
3	C1249/49	Open in Stop Light Switch Circuit	520	Stop light switch Stop light switch control Stop light bulb

It would help if you could get the INF codes too, which any good scan tool or Techstream could retrieve from the FFD (freeze frame data).

 

The next message explains why I underappreciate the blink codes...

Since many posters who try to rely upon the blink codes report two-digit numbers which are not documented, it seems like those codes are not tremendously useful except to tell the OP to check battery voltage which is the default response, anyway.