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

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Interior / Seat / Seat Heater 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

IG power supply

Engine switch on (IG)

11 to 14 V

J43-2 (IG+) - Body ground

GR - Body ground

IG power supply

Engine switch off

Below 1 V

J43-4 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

J48-1 (GND2) - Body ground*

W-B - Body ground

Ground

Always

Below 1 Ω
  • *: w/ Rear No. 2 Seat

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

(d) Measure the voltage and check for pulse generation according to the value(s) in the table below.

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J48-16 (SHP+) - J43-4 (GND)

Y - W-B

Refreshing seat switch volume signal
  • Engine switch on (IG)
  • Refreshing seat switch on (LO)

    (heater position)

Below 1 V

J48-15 (SHD+) - J43-4 (GND)

P - W-B

Refreshing seat switch volume signal
  • Engine switch on (IG)
  • Refreshing seat switch on (LO)

    (heater position)

Below 1 V

J43-14 (LIN1) - Body ground

G - Body ground

Refreshing seat switch signal

Engine switch on (IG)

Pulse generation

CHECK REFRESHING SEAT SWITCH (FOR FRONT SIDE)

(a) Disconnect the J82 refreshing seat switch 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

IG power supply

Engine switch on (IG)

11 to 14 V

J82-2 (IG) - Body ground

L- Body ground

IG power supply

Engine switch off

Below 1 V

J82-7 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the J82 refreshing seat switch connector.

(d) Check for pulse 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 signal

Engine switch on (IG)

Pulse generation

CHECK REFRESHING SEAT SWITCH (FOR REAR SIDE) (w/ Rear Seat Heater) (w/o Rear No. 2 Seat)

(a) Disconnect the J15 refreshing seat switch 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

J15-1 (IG) - Body ground

LG - Body ground

IG power supply

Engine switch on (IG)

11 to 14 V

J15-1 (IG) - Body ground

LG - Body ground

IG power supply

Engine switch off

Below 1 V

J15-5 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the J15 refreshing seat switch connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

J15-3 (RLIN) - Body ground

R - Body ground

Refreshing seat switch signal

Engine switch on (IG)

Pulse generation

CHECK REAR SEAT HEATER SWITCH (w/ Rear Seat Heater) (w/ Rear No. 2 Seat)

(a) Disconnect the V4 rear seat heater switch 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

V4-1 (IG) - Body ground

LG - Body ground

IG power supply

Engine switch on (IG)

11 to 14 V

V4-1 (IG) - Body ground

LG - Body ground

IG power supply

Engine switch off

Below 1 V

V4-5 (E) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

(c) Reconnect the V4 rear seat heater switch connector.

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

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

V4-3 (RLIN) - Body ground

R - Body ground

Rear seat heater switch signal

Engine switch on (IG)

Pulse generation
    Diagnosis System
    DIAGNOSIS SYSTEM DESCRIPTION (a) Seat heater system data and Diagnostic Trouble Codes (DTCs) can be read through the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctio ...

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