ABS and brake warning lights on - Toyota Prius Forum : Prius Online Toyota Forums
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#1 (permalink) Old 09-04-2008, 02:49 PM
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Default ABS and brake warning lights on

Hi,

I've done a search on this forum and online and haven't been able to find a solution to this problem. I'm not a mechanic so try to excuse my ignorance on these issues.

I just moved to Canada with my 2005 Prius. BC regulations require Daytime Running Lights. I took it in to a shop which installed DRL's, but then got an ABS warning light and brake warning lights appearing. They checked the codes on their computer and took it in to a dealer to check on their own computer and apparently no issues came up. They removed the DRL's and checked the connections on the wheel relays (I think) and still the warning lights remain. They drained and re-charged the battery. Apparently the car drives fine and the brakes work fine. I can't get my car back until this gets fixed and it's been a week so far.

Any thoughts on what could be happening? Does anyone have a checklist I could send them of things to run through?

Thanks,

m.
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#2 (permalink) Old 09-05-2008, 01:42 AM
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Default Re: ABS and brake warning lights on

Since it was ok before the shop installed the DRL's I would backtrack there. Was a module installed to control this function, or did the shop just wire them to some power wire connected to the ignition switch?
As an example, when the headlights are used the MFD dims down for nighttime and the tailights come on.
DRL's would illuminate the front lights but not the tail lights, and not dim out the MFD or instument lighting.
I'm sure there is a module that controls all this.
As far as the ABS and brake light warnings, it may just be Toyota's way of warning that the PCM detected that something was changed or added. Maybe no other relationship at all.
If the module was added, maybe a software upgrade or "reflash" is needed.
Anyhow that's my only guess or idea at this point.
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#3 (permalink) Old 09-05-2008, 04:04 AM
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Default Re: ABS and brake warning lights on

However, you do know as the manual states that with any of these brake warnings the car goes right to the dealers. The warning lights indicate either failure of the electric hydraulic pump or the brake accumulator.
The car will brake fine with just one of the systems working but when both go you have "zero" brake applications.
Sounds like it is related to the wireing job but you cant gamble with those warning lights with this type of brake system.
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#4 (permalink) Old 09-10-2008, 12:43 PM
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Default Re: ABS and brake warning lights on

I thought I would post a follow-up so people doing a search on this in the future could find some recommendations.

Well, after 12 days at the shop, with varying degrees of certainty that they were actually doing anything with my car, I finally got irritated enough that I went down there and picked it up and drove it to a dealership. On the drive I could feel that the power-assist brakes were not working (it shuts down when there is an ABS warning). The dealership fixed it in approximately 2 1/2 hours. They identified through a code that a relay under the fuse box had not been reconnected. Because it was under the fuse box, the shop never identified it. The shop had actually taken it to another dealership, and though the shop told me over the phone that the other dealership did not identify any codes, the paperwork that the shop accidentally left in my car proved otherwise... in fact, the other dealership was probably a half hour away from fixing my car (9 days before I got fed up) when the shop felt that the dealership was "ripping them off" and pulled the car out of their service department.

To add insult to injury, based on my own research online (through this forum and others) I had been telling the shop for DAYS that they needed to go back through all the relays and make sure they were well-connected.

So, in my case, ABS and brake warning lights=unconnected relay.

Thanks for your help.
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#5 (permalink) Old 09-10-2008, 07:42 PM
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Default Re: ABS and brake warning lights on

The shop made a critical mistake that many people make---when the warning lights showed up the very first thing you do is go back over every step of the way that you previously did. After all there was no problem with that when you brought it in, right? Instead they start guessing, throwing parts at it etc, thinking it can't be related. It usually is.
Glad you got it repaired, assume the DTLs are operating correctly? Thanks for posting the solution.
l
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