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 MANUALSTOYOTA201886 GT, STANDARD TRANSREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTHEADLIGHTSLIGHTING SYSTEM (EXT) (SERVICE INFORMATION)HEADLIGHT DIMMER SWITCHINSPECTION [06/2016 - 03/2017]PROCEDURE
2018 Toyota 86 GT, Standard Trans
Inspection [06/2016 - 03/2017]: Procedure
2018 Toyota 86 GT, Standard TransSECTION Procedure
- INSPECT HEADLIGHT DIMMER SWITCH ASSEMBLY
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
LIGHT CONTROL SWITCHTester Connection Switch Condition Specified Condition 19 (A) - 12 (EL) Light control switch off 10 kΩ or higher 20 (H) - 12 (EL) 10 kΩ or higher 18 (T) - 12 (EL) 10 kΩ or higher 18 (T) - 12 (EL) Light control switch in tail position Below 1 Ω 18 (T) - 12 (EL) Light control switch in head position Below 1 Ω 20 (H) - 12 (EL) Below 1 Ω 19 (A) - 12 (EL) Light control switch in AUTO position Below 1 Ω DIMMER SWITCHTester Connection Switch Condition Specified Condition 11 (HU) - 12 (EL) Dimmer switch in high position Below 1 Ω 11 (HU) - 12 (EL) Dimmer switch in high flasher position Below 1 Ω 17 (HF) - 12 (EL) Below 1 Ω TURN SIGNAL SWITCHTester Connection Switch Condition Specified Condition 13 (TR) - 12 (EL) Right turn Below 1 Ω 13 (TR) - 12 (EL) Neutral 10 kΩ or higher 15 (TL) - 12 (EL) 10 kΩ or higher 15 (TL) - 12 (EL) Left turn Below 1 Ω TEXT IN ILLUSTRATION*a Component without harness connected
(Headlight Dimmer Switch Assembly)If the result is not as specified, replace the headlight dimmer switch assembly.
- Measure the resistance according to the value(s) in the table below.
RENDER: 1.0x
NO RELATED
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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.