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1998 Cadillac deville headlamp on/off problem

1998 Cadillac deville. When the headlamp switch/knob is off and message "headlamps suggested" come on then headlights come on automatically (daytime running lights), but the side or tail lights are off. However, when I turn on the switch/knob then all lights (side and tail) work but headlamps do not come on, neither high or low beams.. I checked the fuse for the headlamps but it was OK. What could be the problem? What could it be?

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Posted on Jan 02, 2017

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SOURCE: 1998 cadillac deville high beam head lights only

Classic switch problem. Replace your switch and this will fix your problem.

Posted on Jun 11, 2009

  • 507 Answers

SOURCE: Headlamp Bulb not working on 2003 Cadillac Deville

if its just the one you probably need to replace it by getting to the back of the light to get to the globe,there will be a cover you can remove to do it,if you sometimes slap the light on the lens the globe may come back on indicating a loose filament ....will still need changing though

Posted on Oct 28, 2009

  • 180 Answers

SOURCE: 1998 cadillac deville. i do not have low beam

No the dimmer switch doesn't change high/low beams just interior lights. Did you try changing the bulbs?

Good Luck,

Posted on Mar 04, 2010

  • 6826 Answers

SOURCE: Adjust the headlamps on a 1997 DeVille Cadillac.

Use a torx 15 screwdriver to rotate the adjustment screw.

Posted on Jul 02, 2010

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1998 cadillac headlights wont tern off

Check the headlamp relay in the under hood fuse / relay box . The location should be shown on the inside of the lid. Also check HIGH / LOW HEADLAMP relay in the same under hood relay / fuse box .
The headlamps are controlled by the body control module (PZM). The battery positive voltage (B+) is applied at all times through the HDLPS fuse at the switch side of the headlamp relay via CKT 340 (ORN).
Battery positive voltage (B+) is also applied at all times through the RADIO/PHONE fuse to the coil side of the high/low beam headlight relay via CKT 40 (ORN/BLK). Both relays are controlled by the PZM at separate output cavities.
Do you know what a relay is ?
How To Test Relays EricTheCarGuy

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  1. Disconnect the battery ground cable.
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Remove the instrument panel cluster finish panel.
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    Can I program the automatic headlights to always shut off when the ignition is shut off - day or night?

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    There is an adjustable delay for the twilight sentinel to turn the headlights off after the ignition key is removed and it is night time.
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    Mar 21, 2010 | 1997 Cadillac DeVille

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    Relay Switch

    Im trying to locate the relay switch to the headlamps

    Nov 04, 2008 | 1997 Cadillac DeVille

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