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 RX 350 AWDFACTORY OEM SERVICE PROCEDURE

Terminals Of Ecu

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

Fig 1: Identifying Air Conditioning Amplifier Assembly ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage and resistance of each terminal of the connectors.

CONNECTOR TERMINAL VOLTAGE SPECIFICATION

Symbols (Terminal No)	Wire Color	Terminal Description	Condition	Specified Condition
A8-8 (FDEF) - A8-6 (GND)	B - W-B	Front Deicer Signal	Engine switch on (IG) Front deicer switch ON	Below 1 V
A8-8 (FDEF) - A8-6 (GND)	B - W-B	Front Deicer Signal	Engine switch on (IG) Front deicer switch OFF	10 to 14 V
A8-19 (DFG) - A8-6 (GND)	G - W-B	Rear Defogger Signal	Engine switch on (IG) Rear defogger switch OFF	10 to 14 V
A8-19 (DFG) - A8-6 (GND)	G - W-B	Rear Defogger Signal	Engine switch on (IG) Rear defogger switch ON	Below 1 V
A8-6 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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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.