Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHYUNDAI2003TIBURON V6-2.7LREPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSBODY CONTROL MODULETESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSAUTO LIGHT CONTROL FUNCTION
2003 Hyundai Tiburon V6-2.7L
Auto Light Control Function
2003 Hyundai Tiburon V6-2.7LSECTION Auto Light Control Function
AUTO LIGHT CONTROL
1. Function explanation : When multi-function lighting switch is put at AUTO position in ignition key is on state, tail lamp and headlamp turns on automatically depending on the auto light sensor values.
2. Related schematic diagrams
- See the Auto Lights.
3. Input/output signal
- Fuse : Headlamp (Low) Fuse (15 A), Headlamp (High) Fuse (15 A), F21 (10A)
- Input. Auto light switch (H14), Auto light sensor voltage (J11)
- Output: Tail lamp, headlamp
4. Related Hi-scan(pro) failure diagnosis
1. Input/output monitoring
Select "03.LAMP" and press [ENTER]. Then the following screen will be displayed.
Check BCM input/output condition against auto light switch, auto light sensor voltage, auto light option, tail lamp and headlamp.
2. Actuator inspection
Select "01 INPUT ACTUATION" and press [ENTER].
Perform forced drive against auto light switch.
5. Expected failure diagnosis
1. Auto light does not work (Tail lamp and headlamp works by the switch).
2. When auto light is turned on, tail lamp and headlamp turns on simultaneously.
NOTE: When the ambient luminous intensity is dark, tail lamp and headlamp may turn on simultaneously in auto light on condition In this case it's not the failure.
6. Actions by failure symptoms
1. Auto light does not work. (Tail lamp and headlamp work by the switches)
2. When auto light is turned on, tail lamp and headlamp turn on simultaneously.
1. Function explanation : When multi-function lighting switch is put at AUTO position in ignition key is on state, tail lamp and headlamp turns on automatically depending on the auto light sensor values.
2. Related schematic diagrams
- See the Auto Lights.
3. Input/output signal
- Fuse : Headlamp (Low) Fuse (15 A), Headlamp (High) Fuse (15 A), F21 (10A)
- Input. Auto light switch (H14), Auto light sensor voltage (J11)
- Output: Tail lamp, headlamp
4. Related Hi-scan(pro) failure diagnosis
1. Input/output monitoring
Select "03.LAMP" and press [ENTER]. Then the following screen will be displayed.
Check BCM input/output condition against auto light switch, auto light sensor voltage, auto light option, tail lamp and headlamp.
2. Actuator inspection
Select "01 INPUT ACTUATION" and press [ENTER].
Perform forced drive against auto light switch.
5. Expected failure diagnosis
1. Auto light does not work (Tail lamp and headlamp works by the switch).
2. When auto light is turned on, tail lamp and headlamp turns on simultaneously.
NOTE: When the ambient luminous intensity is dark, tail lamp and headlamp may turn on simultaneously in auto light on condition In this case it's not the failure.
6. Actions by failure symptoms
1. Auto light does not work. (Tail lamp and headlamp work by the switches)
2. When auto light is turned on, tail lamp and headlamp turn on simultaneously.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.