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Clayso, Master Automobile Technician
Category: Oldsmobile
Satisfied Customers: 880
Experience:  ASE Master Certified Automobile Technician. 30 Years Experience.
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98 olds intrigue, headlights and tail lights won't turn off

Customer Question

98 olds intrigue, headlights and tail lights won't turn off when I turn key off, any thoughts
Submitted: 1 year ago.
Category: Oldsmobile
Expert:  AZTechBrian replied 1 year ago.

Hello. Are you able to turn off the headlights with the headlamp switch?

Customer: replied 1 year ago.
Expert:  AZTechBrian replied 1 year ago.

Try removing the plastic steering column cover and unplug the headlamp switch and see if they go out then.

Customer: replied 1 year ago.
Give me a little bit, I think my battery is dead, lost all power
Expert:  AZTechBrian replied 1 year ago.

No problem.

Customer: replied 1 year ago.
When I get power back, I will try that then let you know
Expert:  AZTechBrian replied 1 year ago.

Sounds good. If you unplug it and your lights go out, then you will need to replace the switch. This is what I am suspecting is going to be the problem. Let me know. Thanks

Customer: replied 1 year ago.
That didn't work
Expert:  AZTechBrian replied 1 year ago.

They stayed lit with the switch unplugged?

Customer: replied 1 year ago.
Expert:  AZTechBrian replied 1 year ago.

is it the daytime running lights that are on?

Customer: replied 1 year ago.
No, they aren't coming on, they are amber and in the center anyway it could be in my dimmer switch?
Expert:  AZTechBrian replied 1 year ago.

That was my next thought. Check continuity on the switch between the light green and tan terminals while holding the plunger all the way in. If there is no continuity then the switch is bad

Customer: replied 1 year ago.
Recharging Bat. When I flicked my bright in and off the ding noise indicating lights on stopped but bat too dead at that point to check lights
Customer: replied 1 year ago.
What about my sensor in dash tvat turns on lights when it gets dark
Customer: replied 1 year ago.
Could that thinks it's dark out, and if so, why when key is off
Expert:  AZTechBrian replied 1 year ago.

I don't think that's what's causing this to happen. I am going to open this question up in case one of the other experts has experienced this before and can tell you for sure what's causing this. If someone knows they will reply shortly.

Expert:  Clayso replied 1 year ago.

Hi There, I'm Clay a certified master automobile technician with 30 years of automotive repair and diagnostic experience.

From your conversation and the symptoms you're experiencing sounds like power or ground is back feeding through the headlamps circuit and keeping the head and tail lamps on. Just to make sure, you disconnected the 23 way connector (headlamp switch) and the headlamps stayed on?

With the battery charged enough to operate the headlamps, remove these 4 fuses one at a time and see if the head and tail lamps turn off.

Underhood Fuse Block
HDLP R Fuse 15 amp
LP PARK Fuse 20 amp
HDLP L Fuse 15 amp

Interior Fuse Block
RADIO-HVAC Fuse 15 amp

Let me know if one of these fuses or a combination of the fuses changes the lamps operation. Also the headlamp switch connector you disconnected and the lamps stayed on. Was it a 23 way connector?

I'll be here most all of today. Let me know what all you find.