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Turn signal circuit on a 1997 buick century

  • Chevyman
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4 years 6 months ago #48033 by Chevyman
Turn signal circuit on a 1997 buick century was created by Chevyman
On my son's buick the left rear turn signal flashes very fast front left bulb lights but doesn't flash. Bulb looked ok but I replaced it anyway.same thing it lights stays on steady. could this be a bad ground. I'm not sure how this circuit works. Would anyone have a wiring schematic of this circuit. Thank you.

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4 years 6 months ago #48034 by jreardon
Replied by jreardon on topic Turn signal circuit on a 1997 buick century

File Attachment:

File Name: 1997buickc...nals.pdf
File Size:88 KB

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4 years 6 months ago #48035 by Chevyman
Replied by Chevyman on topic Turn signal circuit on a 1997 buick century
Is it possible even thought front left turn signal bulb lights but doesn't flash there is to much resistance in the ground wire for that bulb. Don't understand why rear left turn signal bulb flashes rapidly and front just glows no flash. Maybe do voltage drop test on ground side of circuit.

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4 years 6 months ago - 4 years 6 months ago #48036 by jreardon
Replied by jreardon on topic Turn signal circuit on a 1997 buick century
if front left turn signal is blinking in the instrument cluster, the daytime running lamps control module needs to know that on the light blue/white wire for it to flash the front left turn lamp. The wire I highlighted is either shorted to power or the module is not getting the input to do so or the driver's dead from short to ground.

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As for the rear I think it's too little resistance in the circuit that makes it flash too fast. if the right rear flashes normally, try swapping the bulbs around and see if issue follows the bulb?
Last edit: 4 years 6 months ago by jreardon.

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4 years 6 months ago #48037 by jreardon
Replied by jreardon on topic Turn signal circuit on a 1997 buick century
if the bulbs are dim, yes check for voltage drop and ground resistance of course.

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4 years 6 months ago - 4 years 6 months ago #48042 by Chevyman
Replied by Chevyman on topic Turn signal circuit on a 1997 buick century
So go from blue wire to ground with circuit loaded and I should show zero volts correct
Last edit: 4 years 6 months ago by Chevyman.

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4 years 6 months ago #48046 by Cheryl
Replied by Cheryl on topic Turn signal circuit on a 1997 buick century
Also if that daytime light module isn’t to hard to get to you could swap the wires from left to right. In other words swap terminals b to c see if the problem follows if it did then the module woulld be the problem

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4 years 6 months ago #48047 by Chevyman
Replied by Chevyman on topic Turn signal circuit on a 1997 buick century
When I try a voltage drop test on wire from module to left front turn signal the voltage fluctuates up and down from like 3 volts to like 8 is that correct. It's the white wire with the blue dot

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4 years 6 months ago #48048 by Chevyman
Replied by Chevyman on topic Turn signal circuit on a 1997 buick century
I don't have a schematic of the module connector cheryl. You know where I can find one

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4 years 6 months ago #48049 by jreardon
Replied by jreardon on topic Turn signal circuit on a 1997 buick century
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4 years 6 months ago #48050 by jreardon
Replied by jreardon on topic Turn signal circuit on a 1997 buick century
Do you mean on the light blue wire with the white tracer, you're seeing voltage going up and down? Your meter's black lead is on a good ground and the red lead is on that wire?

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4 years 6 months ago #48052 by Cheryl
Replied by Cheryl on topic Turn signal circuit on a 1997 buick century
Have you checked g108 yet?? Put black meter lead on battery negative then red lead at black wire at left front turn signal bulb pierce the wire or back probe. Turn left turn signal on meter should display below 200 mv. Put meter on mv scale then tell us what you get. Or easier use a test light to check the ground your choice. Check the ground at the bulb then compare to checking ground at battery negative

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4 years 6 months ago #48053 by Chevyman
Replied by Chevyman on topic Turn signal circuit on a 1997 buick century
I'll check this afternoon. I found a ground wire coming out of wiring loom going from left head light connector running towards right fender along lower radiator support. Would this be ground G108?

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4 years 6 months ago #48058 by Cheryl
Replied by Cheryl on topic Turn signal circuit on a 1997 buick century
Sounds like the location according to the diagram. Says it’s on the radiator support

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4 years 6 months ago #48059 by Chevyman
Replied by Chevyman on topic Turn signal circuit on a 1997 buick century
Tonight when I went to check ground light wouldn't light. Tried with bulb from right side to make sure bulb was good. Took a test light to light blue wire to ground so it's getting voltage to bulb socket. I checked and cleaned ground 108. What if I took a wire from battery ground to terminal in bulb socket? Just can't figure this out.

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