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.
2012 Lexus LS 460L AWDFACTORY OEM SERVICE PROCEDURE
PTC Heater Assembly: Inspection: Inspection
- INSPECT PTC HEATER ASSEMBLY
- Measure the resistance according to the value(s) in the table below.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Standard resistance
Tester Connection Condition Specified Condition A-1 - B-1 23 to 25°C (73 to 77°F) 0.5 to 2.5 Ω A-2 - B-1 23 to 25°C (73 to 77°F) 0.5 to 2.5 Ω A-2 - B-2 23 to 25°C (73 to 77°F) 0.5 to 2.5 Ω A-3 - B-2 23 to 25°C (73 to 77°F) 0.5 to 2.5 Ω - If the result is not as specified, replace the PTC heater assembly.
- Measure the resistance according to the value(s) in the table below.
Factory Service Tools
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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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