- Y26-1 (DS1) - Body ground
- Y26-3 (DS12) - Body ground
Lexus NX: Terminals Of Ecu
Lexus NX Service Manual / Vehicle Exterior / Door / Hatch / Power Back Door System / Terminals Of Ecu
TERMINALS OF ECU
CHECK MULTIPLEX NETWORK DOOR ECU
(a) Disconnect the Y26 and Y27 multiplex network door ECU connectors.
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(b) Measure the voltage and resistance according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| Y26-18 (IG) - Body ground | W - Body ground | IG power supply | Power switch on (IG) | 11 to 14 V |
| Power switch off | Below 1 V | |||
| Y26-20 (ECUB) - Body ground | W - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| Y27-1 (B) - Body ground | LA-W - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| Y27-10 (GND) - Body ground | W-B - Body ground | Body ground | Always | Below 1 Ω |
(c) Reconnect the Y26 and Y27 multiplex network door ECU connectors.
(d) Measure the voltage and waveform according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| *: w/ Hands Free Power Back Door | ||||
| Y26-1 (DS1) - Body ground | L - Body ground | Power back door unit assembly LH (door sensor) signal | Power back door not operating | 7 V or higher |
| Power back door operating | Pulse generation (See waveform 1) | |||
| Y26-2 (DS2) - Body ground | R - Body ground | Power back door unit assembly LH (door sensor) signal | Power back door not operating | 7 V or higher |
| Power back door operating | Pulse generation (See waveform 2) | |||
| Y26-3 (DS12) - Body ground | LG - Body ground | Power back door unit assembly RH (door sensor) signal | Power back door not operating | 7 V or higher |
| Power back door operating | Pulse generation (See waveform 1) | |||
| Y26-4 (DS22) - Body ground | B - Body ground | Power back door unit assembly RH (door sensor) signal | Power back door not operating | 7 V or higher |
| Power back door operating | Pulse generation (See waveform 2) | |||
| Y26-5 (DSV2) - Body ground | BE - Body ground | Power back door unit assembly RH (door sensor) power supply | Always | 7 V or higher |
| Y26-6 (OSR) - Y26-24 (OSE) | SB - GR | Power back door sensor assembly RH signal | Power back door sensor assembly RH not pressed | 4 to 6 V |
| Power back door sensor assembly RH pressed | Below 1 V | |||
| Y26-8 (BDDN) - Body ground | LG - Body ground | Back door control switch signal | Back door control switch on | Below 1 V |
| Back door control switch off | Pulse generation | |||
| Y26-10 (CLSW) - Body ground | V - Body ground | Door control switch signal | Door control switch on | Below 1 V |
| Door control switch off | 11 to 14 V | |||
| Y26-14 (KSIN) - Body ground* | W - Body ground | Kick detection signal | Power switch on (IG), kick door control sensor not detecting a foot → detecting a foot | Pulse generation (See waveform 3) |
| Y26-16 (BZR+) - Body ground | V - Body ground | Wireless door lock buzzer signal | Power back door warning buzzer sounding | Pulse generation |
| Power back door warning buzzer not sounding | Below 1 V | |||
| Y26-19 (DSG2) - Body ground | V - Body ground | Power back door unit assembly RH (door sensor) ground | Always | Below 1 V |
| Y26-21 (DSG) - Body ground | GR - Body ground | Power back door unit assembly LH (door sensor) ground | Always | Below 1 V |
| Y26-25 (DSV) - Body ground | G - Body ground | Power back door unit assembly LH (door sensor) power supply | Always | 7 V or higher |
| Y26-26 (OSL) - Y26-24 (OSE) | P - GR | Power back door sensor assembly LH signal | Power back door sensor assembly LH not pressed | 4 to 6 V |
| Power back door sensor assembly LH pressed | Below 1 V | |||
| Y27-4 (DC+) - Y27-3 (DC-) | LA-BR - LA-R | Back door lock assembly (back door lock motor) circuit | Back door lock motor operating | 11 to 14 V |
| Back door lock motor not operating | Below 1 V | |||
(1) Using an oscilloscope, check waveform 1.
Waveform 1 (Reference) | Item | Condition |
|---|---|
| Tester Connection | |
| Tool setting | 2 V/DIV., 2 ms./DIV. |
| Vehicle condition | Power back door operating |
HINT:
The period changes in accordance to the speed at which the power back door is opened and closed.
(2) Using an oscilloscope, check waveform 2.
Waveform 2 (Reference)| Item | Condition |
|---|---|
| Tester Connection |
|
| Tool setting | 2 V/DIV., 2 ms./DIV. |
| Vehicle condition | Power back door operating |
HINT:
The period changes in accordance to the speed at which the power back door is opened and closed.
(3) Using an oscilloscope, check waveform 3.
Waveform 3 (Reference)| Item | Content |
|---|---|
| Tester connection | Y26-14 (KSIN) - Body ground |
| Tool setting | 2 V/DIV., 50 ms./DIV. |
| Vehicle condition | Power switch on (IG), kick door control sensor not detecting a foot → detecting a foot |
| *a | Kick detection signal |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
(a) Disconnect the I53 certification ECU (smart key ECU assembly) connector.
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(b) Measure the voltage and resistance according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| I53-10 (+B) - Body ground | W - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| I53-11 (E) - Body ground | W-B - Body ground | Body ground | Always | Below 1 Ω |
(c) Reconnect the I53 certification ECU (smart key ECU assembly) connector.
(d) Measure the waveform according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| I52-5 (TSW5) - I53-11 (E) | Y - W-B | Back door opener switch assembly signal | Back door opener switch assembly (open switch) off → on | Pulse generation (See waveform 1) |
(1) Using an oscilloscope, check waveform 1.
| *a | In actuality, sampling is being performed |
| Item | Content |
|---|---|
| Terminal No. (Symbol) | I52-5 (TSW5) - I53-11 (E) |
| Tool Setting | 2 V/DIV., 500 ms./DIV. |
| Condition | Back door opener switch assembly (open switch) off → on |
CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
| *1 | Main Body ECU (Multiplex Network Body ECU) | - | - |
(a) Remove the main body ECU (multiplex network body ECU).
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(b) Connect the instrument panel junction block assembly connectors.
(c) Measure the voltage and resistance according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| A-31 (BECU) - Body ground | None - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| A-30 (ACC) - Body ground | None - Body ground | ACC power supply | Power switch on (ACC) | 11 to 14 V |
| Power switch off | Below 1 V | |||
| A-32 (IG) - Body ground | None - Body ground | IG power supply | Power switch on (IG) | 11 to 14 V |
| Power switch off | Below 1 V | |||
| A-11 (GND1) - Body ground | None - Body ground | Body ground | Always | Below 1 Ω |
(d) Install the main body ECU (multiplex network body ECU).
Click here
(e) Measure the voltage and waveform according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| I47-5 (PBDS) - Body ground | R - Body ground | Combination switch assembly signal | Combination switch assembly off | Pulse generation |
| Combination switch assembly on | Below 1 V |
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