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 and check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J43-5 (RDFG) - J43-4 (GND)

P - W-B

Rear window defogger signal

Engine switch on (IG), rear window defogger switch off

11 to 14 V

J43-5 (RDFG) - J43-4 (GND)

P - W-B

Rear window defogger signal

Engine switch on (IG), rear window defogger switch on

Below 2.2 V

CHECK RADIO RECEIVER ASSEMBLY

Click here

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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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