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

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Interior / Seat / Climate Control Seat System / Terminals Of Ecu

TERMINALS OF ECU

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

(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+) - Body ground

GR - Body ground

Air conditioning amplifier power supply

Engine switch off

Below 1 V

J43-2 (IG+) - Body ground

GR - Body ground

Air conditioning amplifier power supply

Engine switch on (IG)

11 to 14 V

J43-4 (GND) - Body ground

W-B - Body ground

Air conditioning amplifier ground

Always

Below 1 Ω

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

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J43-24 (LOUT) - Body ground

GR - Body ground

Climate control blower control signal
  • Engine switch on (IG)
  • Refreshing seat switch (for LH) on

    (blower position)

Pulse generation

(See waveform)

J43-23 (ROUT) - Body ground

BE - Body ground

Climate control blower control signal
  • Engine switch on (IG)
  • Refreshing seat switch (for RH) on

    (blower position)

Pulse generation

(See waveform)

J43-14 (LIN1) - Body ground

G - Body ground

Refreshing seat switch signal

Engine switch on (IG)

Pulse generation

(1) Waveform (Reference):

Measurement Condition

Item

Content

Tester Connection
  • J43-24 (LOUT) - Body ground
  • J43-23 (ROUT) - Body ground

Tool Setting

1 V/DIV., 1 ms/DIV.

Vehicle Condition
  • Engine switch on (IG)
  • Refreshing seat switch on

    (blower position)

REFRESHING SEAT SWITCH (FOR FRONT SIDE)

(a) Disconnect the J82 refreshing seat switch (for front side) 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

J82-2 (IG) - Body ground

L - Body ground

Refreshing seat switch power (for front side) supply

Engine switch off

Below 1 V

J82-2 (IG) - Body ground

L - Body ground

Refreshing seat switch power (for front side) supply

Engine switch on (IG)

11 to 14 V

J82-7 (E) - Body ground

W-B - Body ground

Refreshing seat switch (for front side) ground

Always

Below 1 Ω

(c) Reconnect the J82 refreshing seat switch connector.

(d) Check for pulses according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J82-4 (LIN1) - Body ground

G - Body ground

Refreshing seat switch (for front side) signal

Engine switch on (IG)

Pulse generation
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