Lexus NX: Terminals Of Ecu
TERMINALS OF ECU
CHECK MULTIPLEX NETWORK DOOR ECU
(a) Disconnect the Y26 and Y27 multiplex network door ECU connectors.
(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 |
|---|---|---|---|---|
| Y26-20 (ECUB) - Body ground | W - Body ground | Auxiliary battery power supply | Power switch off | 11 to 14 V |
| 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 | |||
| 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 |
|---|---|---|---|---|
| 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 | |||
| Y26-11 (FUL) - Body ground | W - Body ground | Back door lock assembly (back door courtesy switch) signal circuit | Back door closed → open | Pulse generation → Below 1 V |
| Y26-9 (HAF) - Body ground | G - Body ground | Back door lock assembly (latch switch) signal circuit | Back door closed → fully open | 11 to 14 V → Below 1 V |
| Y26-7 (POS) - Body ground | B - Body ground | Back door lock assembly (initial switch) signal circuit | Back door open → Back door closer operates → Back door closed | Below 1 V → 11 to 14 V → Below 1 V |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
(a) Disconnect the I53 certification ECU (smart key ECU 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 |
|---|---|---|---|---|
| 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 voltage and waveform according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| I52-5 (TSW5) - Body ground | Y - Body ground | Back door opener switch assembly signal | Back door opener switch assembly (open switch) off | Pulse generation |
| Back door opener switch assembly (open switch) on | Below 1 V |
READ NEXT:
Dtc Check / Clear
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Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART Back Door Closer System DTC No. Detection Item Link B2250 Back Door Closer Operation Malfunction B2251 Back Door Closer Switch Malfunction
SEE MORE:
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