- Power switch on (IG)
- Climate control switch (for Front Passenger Side) on
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 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) | | Pulse generation (See waveform) |
| I54-11 (SVDB) - Body ground | Y - Body ground | Seat blower drive signal (for Driver Side) |
| 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 |
|
| Item | Content |
|---|---|
| Tester Connection | I54-11 (SVDB) - Body ground |
| Tool Setting | 1 V/DIV., 1 ms/DIV. |
| Vehicle Condition |
|
AIR CONDITIONING CONTROL ASSEMBLY
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