Lexus NX: Terminals Of Ecu
TERMINALS OF ECU
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| *1 | Main body ECU (multiplex network body ECU) | - | - |
CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
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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.
| Tester Connection | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| A-11 (GND1) - Body ground | None - Body ground | Ground | Always | Below 1 Ω |
| 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-31 (BECU) - Body ground | None - Body ground | Auxiliary battery power supply | Always | 11 to 14 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 | |||
| I48-6 (FLCY) - Body ground | G - Body ground | Front door courtesy light switch assembly LH input signal | Front door LH closed (OFF) → open (ON) | 10 kΩ or higher → Below 1 Ω |
| I48-27 (FRCY) - Body ground | W - Body ground | Front door courtesy light switch assembly RH input signal | Front door RH closed (OFF) → open (ON) | 10 kΩ or higher → Below 1 Ω |
| A-13 (LCTY) - Body ground | None - Body ground | Rear door courtesy light switch assembly LH input signal | Rear door LH closed (OFF) → open (ON) | 10 kΩ or higher → Below 1 Ω |
| A-2 (RCTY) - Body ground | None - Body ground | Rear door courtesy light switch assembly RH input signal | Rear door RH closed (OFF) → open (ON) | 10 kΩ or higher → Below 1 Ω |
| A-4 (BCTY) - Body ground | None - Body ground | Back door courtesy light switch signal | Back door closed (OFF) → open (ON) | 10 kΩ or higher → Below 1 Ω |
| I48-11 (HCTY) - Body ground | SB - Body ground | Engine hood courtesy switch input signal | Engine hood open (OFF) → closed (ON) | 10 kΩ or higher → Below 1 Ω |
(d) Install the main body ECU (multiplex network body ECU) to the instrument panel junction block assembly.
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(e) Measure the voltage and check for pulses according to the value(s) in the table below.
| Tester Connection | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
|
*1: w/o Security Horn Assembly
*2: w/ Security Horn Assembly | ||||
| 4D-40 (LSFL) - Body ground | B - Body ground | Front door LH unlock detection switch input signal | Front door LH unlocked | Below 1 V |
| Power switch off, all doors closed and front door LH locked | Pulse generation | |||
| 4D-39 (LSFR) - Body ground | P - Body ground | Front door RH unlock detection switch input signal | Front door RH unlocked | Below 1 V |
| Power switch off, all doors closed and front door RH locked | Pulse generation | |||
| 4A-34 (LSWL) - Body ground | Y - Body ground | Rear door LH unlock detection switch input signal | Rear door LH unlocked | Below 1 V |
| Power switch off, all doors closed and rear door LH locked | Pulse generation | |||
| I47-2 (LSWR) - Body ground | Y - Body ground | Rear door RH unlock detection switch input signal | Rear door RH unlocked | Below 1 V |
| Power switch off, all doors closed and rear door RH locked | Pulse generation | |||
| 4B-48 (SH) - Body ground*2 | V - Body ground | Security horn drive | Security horn sounding (Theft deterrent system is in alarm sounding state) | Pulse generation (Below 1 V ←→ 11 to 14 V) |
| I47-18 (SSCL) - Body ground*1 | W - Body ground | Theft warning siren drive | Theft warning siren sounding (Theft deterrent system is in alarm sounding state) | Pulse generation (Below 1 V ←→ 11 to 14 V) |
| 4B-49 (HORN) - Body ground | LG - Body ground | Vehicle horn drive | Vehicle horns sounding (Theft deterrent system is in alarm sounding state) | Pulse generation (Below 1 V ←→ 11 to 14 V) |
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