Lexus NX manuals

Lexus NX: Terminals Of Ecu

Lexus NX Service Manual / Vehicle Interior / Seat / Climate Control Seat System / 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 off

Below 1 V

Power switch on (IG)

11 to 14 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) Check for pulses according to the value(s) in the table below.

Tester Connection

Wiring Color

Terminal Description

Condition

Specified Condition

I50-37 (LIN1) - Body ground

B - Body ground

Climate control switch signal (LIN)

Power switch on (IG)

Pulse generation

I54-10 (SVPB) - Body ground

GR - Body ground

Seat blower drive signal (for Front Passenger Side)
  • Power switch on (IG)
  • Climate control switch (for Front Passenger Side) on

Pulse generation

(See waveform)

I54-11 (SVDB) - Body ground

Y - Body ground

Seat blower drive signal (for Driver Side)
  • Power switch on (IG)
  • Climate control switch (for Driver Side) on

Pulse generation

(See waveform)

(1) Waveform (Reference):

Measurement Condition

Item

Content

Tester Connection

I54-10 (SVPB) - Body ground

Tool Setting

1 V/DIV., 1 ms/DIV.

Vehicle Condition
  • Power switch on (IG)
  • Climate control switch (for Front Passenger Side) on
Measurement Condition

Item

Content

Tester Connection

I54-11 (SVDB) - Body ground

Tool Setting

1 V/DIV., 1 ms/DIV.

Vehicle Condition
  • Power switch on (IG)
  • Climate control switch (for Driver Side) on

AIR CONDITIONING CONTROL ASSEMBLY

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