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Headlights stay on after engine is shut well where is the light sensor module located?

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The light sensor module is actually a relay and is located in the fuse box underneath the dashboard on the driver's side.

Posted on Aug 02, 2009


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I have narrowed my problem of no working lights on my 97 Hyundai 2 door hatchback to the switch that turns on the lights after the engine is started. Everything else works, tail lights running lights, even...

No, I wouldn't suspect the headlight switch. Something more sinister, more surreal, too: a module, maybe a body control module, or a light control module, probably under the dash somewhere. GM began using a lighting control module (LCM) at least as far back as 1992, tucked unhandily up under the dash, and wired between the headlight switch and everything else in the lighting circuits.
Normal to suspect the headlight switch, but the odd conjunction of the car running and the headlights' actions suggest a module (another computer!) may be in there. The headlight switch should have no effect on it if the engine was running or not. You would have to see a wiring diagram in a repair manual to check. I am not familiar with your Hyundai, but if you could find a diagram, you should be able to fix it.
If you register for free at, giving make, model, year and engine size of vehicle, you can access wiring diagrams and repair procedures. Just look under repair guides.
Wiring diagrams were under Chassis Electrical, if I recall.

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    What do the symbols on the fuse guide stand for?

    Fuse Locations & Functions
    1. Washer nozzle heaters, glove compartment light (10A).
    2. Turn signal lights (10A).
    3. Fog light relay, instrument panel light dimmer switch (5A).
    4. License plate light (5A).
    5. Comfort system, cruise control, A/C, steering wheel module (7.5A).
    6. Central locking system (5A).
    7. Back-up lights, speedometer vehicle speed sensor (VSS) (10A).
    8. Open
    9. Anti-lock brake system (ABS) (5A).
    10. Engine control module (ECM): gasoline engine (10A)
    11. Instrument cluster, shift lock solenoid (5A).
    12. Data Link Connector (DLC) power supply (7.5A).
    13. Brake tail lights (10A).
    14. Interior lights, central locking system (10A).
    15. Instrument cluster, transmission control module (TCM) (5A).
    16. A/C clutch, after-run coolant pump (10A).
    17. Open.
    18. Headlight high beam, right (10A).
    19. Headlight high beam, left (10A).
    20. Headlight low beam, right (15A).
    21. Headlight low beam, left (15A).
    22. Parking lights right, side marker right (5A).
    23. Parking lights left, side marker left (5A).
    24. Windshield washer pump, windshield wiper motor (20A).
    25. Fresh air blower, A/C (25A).
    26. Rear window defogger (25A).
    27. Motor for rear windshield wiper (15A). (if equipped)
    28. Fuel pump (FP) (15A).
    29. Engine control module (ECM) gasoline engine (15A)
    30. Power sunroof control module (20A).
    31. Transmission control module (TCM) (20A).
    32. Injectors: gasoline engine (10A)
    33. Headlight washer system (20A).
    34. Engine control elements (10A).
    35. 12 V power outlet (in luggage compartment) (30A).
    36. Fog lights (15A). (if equipped)
    37. Terminal (86S) on radio, Instrument cluster (10A).
    38. Central locking system (w/ power windows), Trunk light, fuel door, Trunk lid (15A).
    39. Emergency flashers (15A).
    40. Dual tone horn (20A).
    41. Cigarette lighter (15A).
    42. Radio (25A).
    43. Engine control elements (10A).
    44. Heated seats (15A). (if equipped)

    Fuse arrangements in fuse bracket/battery:
    S162. Glow plugs (coolant) (50A).
    S163. Fuel pump (FP) relay/glow plug relay (50A).
    S164. Coolant fan control (FC) control module/coolant fan (40A).
    S176. Relays panel interior (110A).
    S177. Generator (GEN) (90 Amp.) (110A). Generator (GEN) (120 Amp.) (150A).
    S178. ABS (hydraulic pump) (30A).
    S179. ABS (30A).
    S180. Coolant fan (30A).


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