So... 06 Z06, headlight recall has been done by previous owner and worked fine for however long ago it was done. Recently its back. I pulled the fuse block out and flexed the recall wire to check for breaks and seemed good. Continuity seemed fine. I replaced the multi function switch and no dice. I'm a shade tree mechanic however I do have a older power probe an old mechanic gave me and I can follow directions. Haven't had time unfortunately to check what has power cold then after lights go out check what lost power. Trying to create a game plan for the next time I can work on it. Any input and direction would be great appreciated. Thanks in advance

 

So this is just the low beams ??…do you have a 12 volt test light ??…I’d be careful with that Power Probe…you can do a lot of damage with that thing….did you try swapping the low beam relay with the high beam relay ??…so you know how to check a relay or follow a wiring diagram ??….”seemed good” or “seemed fine” is not good enough…you have to be 100% positive in your testing…BTW I see you live in Florida…you’re a “palm tree mechanic”…not a shade tree !!

 

C5 Daig, thank you. Palm tree for sure.... The relay was my first thing I did. I should have stated that. I pulled the cover off the old relay and with my fingers, while relay installed, manually completed the circuit and the low beams would work. Hoping that would fix it, I bought one however no luck. Looking to trace down what's making the relay activate? I do have 12v however for now just using probe for hot or ground. Thank you again for your input

 

Rob, I know that most of us here on the forms don't like dealerships. I live in Ruskin (just south of Tampa). Do you know of a good dealership in the greater Tampa Bay area that you would trust to complete the headlight recall?

 

Any dealership should be able to perform this recall because it’s just splicing in a jumper wire into the fusebox…I think they could handle it…this yes, but diagnosing NO !!

 

Thank you, sir!

 

Ok, so you will need a test light to do a quick test…we know the “load” side of the relay is good so we need to test the “control” side”…the pic is if you were over the fusebox and arrow is to the front of the car…with test light connected to GROUND the light should illuminate when probing the coil feed terminal…if good now connect the test light to battery POSITIVE or the B+ stud on the fusebox…the ignition can be off for this…turn the headlight on and the test light should illuminate…the issue can be no coil feed, broken wire on relay control between fusebox and BCM or even a bad BCM not providing a ground to the fusebox…also a bad stalk…testing would have to be done there…we can start here…also with the test light if the probe end is thick you may not reach into the fusebox to touch the terminal…if so you can use something thin to insert into the terminal to test and you don’t want to spread the terminal apart either.

 

In case I don't get back to you today and you want to continue diagnosing and when you turn on the headlights and the test light does NOT illuminate on the relay control terminal at the fuse box we will have to see if maybe there is a broken wire between the fuse box and the BCM...use your ohm meter and go from the relay control fuse box terminal to the only PINK/WHITE wire at the BCM C2 connector which is the upper right BCM Connector...if GOOD continuity we will then check the headlight "signal on" circuit wire at the BCM...find the only WHITE wire at the C2 connector again and you should see 12.6 or system voltage at the BCM...now turn on the headlights...the 12.6 volts will get pulled to ground (around 0.1 volts) and that input tells the BCM to ground the relay control terminal at the fuse box....now if the voltage does not get pulled to ground we will have to investigate the wiring between the BCM and stalk...G201 supplies the ground through the MFS for the "signal on" circuit...G201 is at the base of the left A pillar...if voltage gets pulled to ground and BCM to MFS wiring is good but no test light action at fuse box BCM is most likely bad...I use these "piercing" probes below to check the wiring...after use I'll use Liquid Electrical Tape to seal the tiny hole…even nail polish can be used.

 

C5 Daig thank you. I will do that first chance I get and share the results.

 

C5 Diag that is very informative. It will give me direction for quite some time. I had searched the forum for a while looking for threads on this subject. I thank you again

 

No problem !!

 

If you know how to read a wiring diagram.