Lexus NX: Terminals Of Ecu

TERMINALS OF ECU

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

(a) Disconnect the I50 air conditioning amplifier assembly connector.

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

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

I50-1 (IG+) - Body ground

SB - Body ground

IG power supply

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V

I50-14 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω

I50-21 (B) - Body ground

GR - Body ground

Battery power supply

Power switch off

11 to 14 V

(c) Reconnect the I50 air conditioning amplifier assembly connector.

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

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

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

I50-16 (SHP+) - Body ground

V - Body ground

Seat heater (for Front Passenger Side) drive signal

  • Power switch on (IG)
  • Seat heater switch (for Front Passenger Side) on

Below 1 V

I50-17 (SHD+) - Body ground

LG - Body ground

Seat heater (for Driver Side) input signal

  • Power switch on (IG)
  • Seat heater switch (for Driver Side) on

Below 1 V

I50-18 (SHPE) - Body ground*

GR - Body ground

Seat heater (for Rear RH) input signal

  • Power switch on (IG)
  • Refreshing seat switch (for Rear RH) on

Below 1 V

I50-36 (SHDE) - Body ground*

LG - Body ground

Seat heater (for Rear LH) input signal

  • Power switch on (IG)
  • Refreshing seat switch (for Rear LH) on

Below 1 V

I50-37 (LIN1) - Body ground

B - Body ground

Seat heater switch signal

Power switch on (IG)

Pulse generation

I54-3 (TSR) - I54-7 (SG-3)

P - R

Seat heater sensor (for Front Passenger Side) input signal

Engine switch off

(0 to 30°C [32 to 86°F])

  • 0°C(32°F): 23.74 kΩ
  • 30°C(86°F): 8.441 kΩ

I54-4 (TSL) - I54-8 (SG-6)

W - G

Seat heater sensor (for Driver Side) input signal

Engine switch off

(0 to 30°C [32 to 86°F])

  • 0°C(32°F): 23.74 kΩ
  • 30°C(86°F): 8.441 kΩ

I54-5 (TFAR) - I54-23 (SG-7)*

R - W

Seat heater sensor (for Rear RH) input signal

Engine switch off

(0 to 30°C [32 to 86°F])

  • 0°C(32°F): 23.74 kΩ
  • 30°C(86°F): 8.441 kΩ

I54-7 (SG-3) - Body ground

R - Body ground

Ground for seat heater sensor (for Front Passenger Side)

Always

Below 1 Ω

I54-8 (SG-6) - Body ground

G - Body ground

Ground for seat heater sensor (for Driver Side)

Always

Below 1 Ω

I54-20 (TFAL) - I54-23 (SG-7)*

G - W

Seat heater sensor (for Rear LH) input signal

Engine switch off

(0 to 30°C [32 to 86°F])

  • 0°C(32°F): 23.74 kΩ
  • 30°C(86°F): 8.441 kΩ

I54-16 (RLIN) - Body ground*

V - Body ground

Refreshing seat switch signal (LIN)

Power switch on (IG)

Pulse generation (See waveform)

I54-23 (SG-7) - Body ground*

W - Body ground

Ground for seat heater sensor (for Rear LH and RH)

Always

Below 1 Ω

  • *: w/ Rear Seat Heater

(f) Wavefrom:

Item

Content

Terminal No.

I54-16 (RLIN) - Body ground*

Tool Setting

2 V/DIV., 20 μs/DIV.

Vehicle Condition

Power switch on (IG)

  • *: w/ Rear Seat Heater

CHECK AIR CONDITIONING CONTROL ASSEMBLY

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