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sprinkles08
sprinkles08, ASE Certified Technician
Category: Toyota
Satisfied Customers: 23114
Experience:  ASE Master and Advanced level certified. Factory trained with 17 years dealership experience
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I have a 2006 scion tc. I replaced both the rear wheel

Customer Question

I have a 2006 scion tc. I replaced both the rear wheel bearing assemblies including the abs sensors, after which it started to throw a p0500 code. I checked all the fuses and if I use a volt meter i can see the signal coming off all the sensors when i spin them and i cant find any issues in the wiring.
JA: Most vehicles have two fuse panels. Have you located both?
Customer: yeah they are all goo good
JA: Are you fixing your tC yourself? What have you tried so far?
Customer: i work in shop so yeah haha. I have checked all the sensors and their harnesses and scanned it with a snapon modis. i can try to reset the code bu if i try to use that to test the abs system, i keep getting a communication eorror
JA: Anything else you want the mechanic to know before I connect you?
Customer: thats about it
Submitted: 11 months ago.
Category: Toyota
Expert:  david craig replied 11 months ago.

Hi Im David, did you drive the vehicle after the install?

Customer: replied 11 months ago.
Customer: replied 11 months ago.
it was fine during a test drive but everything happened the second time i went to drive it
Expert:  david craig replied 11 months ago.

and you cant get into the system to read sensor output while driving?

Customer: replied 11 months ago.
i get a communication error if i try.
Customer: replied 11 months ago.
I wired up aftermarket lights before as well, will running light impotence effect it?
Expert:  david craig replied 11 months ago.

wiring up aftermarket anything screws crap up. its unreal how many problem i run into becaise of aftermarket lights,alarms,stereos..etc...

Customer: replied 11 months ago.
I understand that it's a can bus and how sensitive those can be but i do this professionally and i have not run into anything like this. do you think load resistors could help
Expert:  david craig replied 11 months ago.

they sure can. but again these can busses will drive you nuts with things like this.

Customer: replied 11 months ago.
if I try that and it doesn't work, then what would you suggest?
Expert:  david craig replied 11 months ago.

taking those dang lights out

Customer: replied 11 months ago.
The only lights that were changed to LED were the running lights. We tried disconnecting them and resetting the computer, but nothing has changed.
Expert:  david craig replied 11 months ago.

have you checked the dlc connector for the correct outputs?

Customer: replied 11 months ago.
what do you mean?
Expert:  david craig replied 11 months ago.

you said you cant communicate with the abs module right?

Customer: replied 11 months ago.
correct
Expert:  david craig replied 11 months ago.

ok. check for grounds at 4 and 5 at the DLC. check the k line voltage at 7 and make sure you have B+ on 16.

Customer: replied 11 months ago.
pin 7 gets ignition power only and pin 16 gets constant power. ground on 4 and 5 are good.
Expert:  david craig replied 11 months ago.

whats the voltage on 7?

Customer: replied 11 months ago.
with ignition on it was 11.4
Expert:  david craig replied 11 months ago.

ok. it should be 1 volt less than B+, now what the voltage with key off?

Customer: replied 11 months ago.
5.6 which is half of our current B+
Expert:  david craig replied 11 months ago.

so all of that is good. im out of ideas my friend. i will opt out and let someone else chime in.

Customer: replied 11 months ago.
okay thank you for trying, you understand my frustrations now haha
Expert:  sprinkles08 replied 11 months ago.

Hello and welcome to JustAnswer!

If the ABS module is the only thing that won't communicate then you don't need to be concerned with the data link connector.

If the ABS module isn't awake it is missing a power or ground feed or has failed. If fuses are good then the next step would be to test the module's power and ground feeds and then it's communication bus voltages directly at the module to ensure there isn't a wiring issue. If all inputs are found to be present yet the module doesn't communicate then it can be condemned.