odd turn signal problems
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From: Illinios
odd turn signal problems This morning I put in new sockets for the running/turn lights. Installation went fine and when I turned the key, only the driver side came on. Turn the switch to running lights and both are on, and headlights bright and dim both work. When I tried the blinkers on all settings neither front lights blink while my rears still work perfect. The indicators inside the cab work as if nothing is wrong (but they did this before the new sockets too).
Summery : front blinkers don't blink while rears do
With key on but switch off only driver side comes on, with the switch on both light up
Is this pointing toward a fuse or something? I have to admit, I haven't checked anything else as I work nights and its getting close to nap time. But any ideas for me to try tomorrow morning are welcome. After the fuses I am kind of lost on my own though.
Summery : front blinkers don't blink while rears do
With key on but switch off only driver side comes on, with the switch on both light up
Is this pointing toward a fuse or something? I have to admit, I haven't checked anything else as I work nights and its getting close to nap time. But any ideas for me to try tomorrow morning are welcome. After the fuses I am kind of lost on my own though.
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From: Illinios
Lol, that's the thing, I have never had front turn signals or running lights since I bought the car... I am not even sure if the guys who wired up the old sockets did it right (was a pretty ****-poor job) so I just followed how they were wired, A - brown, B - blue, G - black.
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From: Illinios
Unless something else had failed (switch or something in the dash) before I bought the car...
Looking for different components of the system to check, not just connections as everything is soldered and am pretty sure making good contact. Back to searching I guess. I did find a thread along time ago about a step-by-step of checking different components but having trouble finding it again...but that other members problem, the rears would stay solid so not sure if it would help anyway.
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From: Illinios
I guess it is possible to assume that who ever rewired that sockets last time was completly incompetent and didn't even look where the wires went before cutting the old off...but nothing else is rigged like that on the whole car so I am thinking that isn't the problem.
From that other thread, I do remember something about a box behind the radio about the size of a cigarette box. Not totally sure on what it does though lol.
From that other thread, I do remember something about a box behind the radio about the size of a cigarette box. Not totally sure on what it does though lol.
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From: Illinios
Yup, I just searched "radio cigarette box" and found the thread I was looking for...weird what you have type in some times lol.
But yeah, when I get home gonna bust out the test light and check power at the blue wires and trace back to the module. I think I might look for my haynes manual and see if I can figure out if the previous owner had the wires going to the correct slots on the socket too...I would think that not a lot of anything would work up front if that was the case though.
All it would take is getting a ground wire flipped position with one of the others and it will still sort of work but not work right. Heck, GM in their brilliance totally screwed up the wiring in my 2002 trailblazer's front turn signal sockets, but their screwup still manages to work normally because of which two wires they flipped 
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From: Illinios
^^^some how that doesn't surprise me. The more experience some one gets under their belt working on odd things, you can't help but wonder "why?". Prime example - 4th gen TA drl/turn signal design.
Engineers anyhow...hmph
Engineers anyhow...hmph
But, it sounds like you do have a bad DRL module. (If your sockets are wired correctly and your flashers are good.) If you end up replacing the DRL module, I'd be interested in acquiring to old/bad one from you so I can dissect it.
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From: Illinios
You gotta keep in mind that the electrical on a 2002 4th gen was designed in the 1980's for the 3rd gen! All that got carried over and the state of electrical engineering was a lot different back then. Dating myself here... It wasn't as easy to make printed circuit boards, etc. back then. So, a lot of the stuff is very "old school."
But, it sounds like you do have a bad DRL module. (If your sockets are wired correctly and your flashers are good.) If you end up replacing the DRL module, I'd be interested in acquiring to old/bad one from you so I can dissect it.
But, it sounds like you do have a bad DRL module. (If your sockets are wired correctly and your flashers are good.) If you end up replacing the DRL module, I'd be interested in acquiring to old/bad one from you so I can dissect it.
That's cool, if I do end up replacing the module, you buy its bus ticket and its yours lol.
I didn't get to test anything yesterday since it was raining and with no garage, I wasn't feeling it...and now the weather says rain for most of he week. Hopefully I'll get to it this weekend.
Did you replace your module? Any update on this?
I have been having a similar issue, I ended up replacing both turn signal housings, both sockets, both bulbs, and the flasher.
I am still having odd behavior, both my DRL turn on when I first start the car up, but sometimes after i use the left turn signal the left DRL will stay off. I can turn on the parking lights and it will light up on the dimmer filament. Even weirder thing is that i can use the right turn singal and then sometimes the left DRL will come back on.
I am thinking my issue must be in the DRL module. I guess i will try replacing it, where would i get one? A junkyard? I guess i could try GM parts direct, anyone know the part number?
I have been having a similar issue, I ended up replacing both turn signal housings, both sockets, both bulbs, and the flasher.
I am still having odd behavior, both my DRL turn on when I first start the car up, but sometimes after i use the left turn signal the left DRL will stay off. I can turn on the parking lights and it will light up on the dimmer filament. Even weirder thing is that i can use the right turn singal and then sometimes the left DRL will come back on.
I am thinking my issue must be in the DRL module. I guess i will try replacing it, where would i get one? A junkyard? I guess i could try GM parts direct, anyone know the part number?
They're a pain in the ***! I replaced both housings, one socket, both bulbs and when I turn the car on both turn on and work just fine except when I turn the headlights on one turns off. When I turn on the turn signal on the failing side it does flash just fine but won't stay on once the turn signal is off again. 
The DRL and flasher use one filament in the bulb. The parking lights use the other filament. When you turn on the parking lights, the DRL function turns off.
So, your parking filament is either burned out in that bulb or you have a wiring/socket problem.
So, your parking filament is either burned out in that bulb or you have a wiring/socket problem.
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From: 20 minutes from the Valley...
Did you replace your module? Any update on this?
I have been having a similar issue, I ended up replacing both turn signal housings, both sockets, both bulbs, and the flasher.
I am still having odd behavior, both my DRL turn on when I first start the car up, but sometimes after i use the left turn signal the left DRL will stay off. I can turn on the parking lights and it will light up on the dimmer filament. Even weirder thing is that i can use the right turn singal and then sometimes the left DRL will come back on.
I am thinking my issue must be in the DRL module. I guess i will try replacing it, where would i get one? A junkyard? I guess i could try GM parts direct, anyone know the part number?
I have been having a similar issue, I ended up replacing both turn signal housings, both sockets, both bulbs, and the flasher.
I am still having odd behavior, both my DRL turn on when I first start the car up, but sometimes after i use the left turn signal the left DRL will stay off. I can turn on the parking lights and it will light up on the dimmer filament. Even weirder thing is that i can use the right turn singal and then sometimes the left DRL will come back on.
I am thinking my issue must be in the DRL module. I guess i will try replacing it, where would i get one? A junkyard? I guess i could try GM parts direct, anyone know the part number?
Sounds like it might be your turn signal switch...if it isn't completely breaking the connection to the left signal it may send enough current to kill the DRL but not to cycle the flasher...when it does it, try moving the turn signal switch around a little and see if the DRL comes back on.
I hope that it is the turn signal switch, cause I found the part # (10407669) and GMpartsdirect wants $220.71 for the DRL module
F'n Sh#t!!
- When its acting up, turn on the hazards and see what happens.
(If I recall correctly, the hazards go through the DRL module but not the turn signal switch.)
For what a module costs, I'd want to do some testing at the DRL module to see what's going on before plunking down the $$$ for a new one. (You might also have luck getting a used module.)