Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Terminals Of Ecu

TERMINALS OF ECU

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

*A

w/o Seat Heater System

*B

w/ Seat Heater System

(a) Disconnect the J43 air conditioning amplifier assembly connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

HINT:

Measure the values on the wire harness side with the connector disconnected.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J43-2 (IG+) - J43-4 (GND)

GR - W-B

Power source (IG)

Engine switch on (IG)

11 to 14 V

J43-2 (IG+) - J43-4 (GND)

GR - W-B

Power source (IG)

Engine switch off

Below 1 V

J43-1 (B) - J43-4 (GND)

R - W-B

Battery power supply

Always

11 to 14 V

J43-4 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the J43 air conditioning amplifier assembly connector.

(d) Measure the voltage according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J43-17 (FDEF) - J43-4 (GND)

W - W-B

Wiper Deicer signal

Engine switch on (IG), Front wiper deicer switch off

11 to 14 V

J43-17 (FDEF) - J43-4 (GND)

W - W-B

Wiper Deicer signal

Engine switch on (IG), Front wiper deicer switch on

Below 2.2 V

    Problem Symptoms Table
    PROBLEM SYMPTOMS TABLE NOTICE: If the battery voltage is low, the seat heater system may not operate. When "Operation of Electrical Items Restricted." is not displayed on the multi-information disp ...

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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