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Turn signal circuit on a 1997 buick century

Chevyman
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4 years 11 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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jreardon
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4 years 11 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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Chevyman
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4 years 11 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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jreardon
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4 years 11 months ago - 4 years 11 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.

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 11 months ago by jreardon.

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jreardon
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4 years 11 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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Chevyman
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4 years 11 months ago - 4 years 11 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 11 months ago by Chevyman.

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Cheryl
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4 years 11 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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Chevyman
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4 years 11 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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Chevyman
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4 years 11 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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jreardon
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4 years 11 months ago #48049 by jreardon

Replied by jreardon on topic Turn signal circuit on a 1997 buick century

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jreardon
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4 years 11 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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Cheryl
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4 years 11 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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Chevyman
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4 years 11 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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Cheryl
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4 years 11 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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Chevyman
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4 years 11 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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