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.
Light Control Rheostat: Inspection: Inspection
- INSPECT LIGHT CONTROL RHEOSTAT (w/o Headlight Cleaner System)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- Measure the resistance according to the value(s) in the table below.
Standard resistance
Tester Connection Switch Condition Specified Condition 3 (UP) - 5 (E) UP ON (Pushed) Below 200 Ω 3 (UP) - 5 (E) UP OFF (Not pushed) 1MΩ or higher 7 (DOWN) - 5 (E) DOWN ON (Pushed) Below 200 Ω 7 (DOWN) - 5 (E) DOWN OFF (Not pushed) 1MΩ or higher If the result is not as specified, replace the rheostat.
- Inspect the switch illumination.
- Connect the battery positive (+) lead to terminal 8 (ILL+) and the negative (-) lead to terminal 6 (ILL-), then check that the light comes on.
OK
LED comes on.
If the result is not as specified, replace the rheostat.
- Connect the battery positive (+) lead to terminal 8 (ILL+) and the negative (-) lead to terminal 6 (ILL-), then check that the light comes on.
- Measure the resistance according to the value(s) in the table below.
- INSPECT LIGHT CONTROL RHEOSTAT (w/ Headlight Cleaner System)
- Measure the resistance according to the value(s) in the table below.
Standard resistance
Tester Connection Switch Condition Specified Condition 3 (UP) - 5 (E) UP ON (Pushed) Below 200 Ω 3 (UP) - 5 (E) UP OFF (Not pushed) 1MΩ or higher 7 (DOWN) - 5 (E) DOWN ON (Pushed) Below 200 Ω 7 (DOWN) - 5 (E) DOWN OFF (Not pushed) 1MΩ or higher 2 (B) - 5 (E) CLEANER ON (Pushed) Below 200Ω 2 (B) - 5 (E) CLEANER OFF (Not pushed) 1MΩ or higher If the result is not as specified, replace the rheostat.
- Inspect the switch illumination.
- Connect the battery positive (+) lead to terminal 8 (ILL+) and the negative (-) lead to terminal 6 (ILL-), then check that the light comes on.
OK
LED comes on.
If the result is not as specified, replace the rheostat.
- Connect the battery positive (+) lead to terminal 8 (ILL+) and the negative (-) lead to terminal 6 (ILL-), then check that the light comes on.
- Measure the resistance according to the value(s) in the table below.
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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.
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