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.
2007 Lexus IS 350FACTORY OEM SERVICE PROCEDURE
Terminals Of Ecu
- CHECK A/C AMPLIFIER ASSEMBLY
- Measure the voltage and resistance of each terminal of the connectors.
Voltage
A/C AMPLIFIER ASSEMBLY (VOLTAGE)
| Symbols (Terminal No) | Wire Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| DFG (J58-3) - GND (J58-20) | B - W-B | Rear Defogger Signal | Engine switch on (IG) Rear defogger switch OFF | 10 to 14 V |
Resistance
A/C AMPLIFIER ASSEMBLY (RESISTANCE)
| Symbols (Terminal No) | Wire Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| GND (J58-20) - Body ground | W-B - Body ground | Ground | Always | Below 1 ohms |
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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