Lexus NX: Terminals Of Ecu
TERMINALS OF ECU
CHECK HEADLIGHT ECU SUB-ASSEMBLY LH
(a) Disconnect the A19 headlight sub-assembly LH connector.
(b) Measure the resistance and voltage according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| A19-4 (IG) - Body ground | L - Body ground | Ignition power supply | Power switch off | Below 1 V |
| Power switch on (IG) | 11 to 14 V | |||
| A19-13 (ECUB) - Body ground | R - Body ground | Power supply | Power switch off | Below 1 V |
| Power switch on (IG) | 11 to 14 V | |||
| A19-12 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
(c) Reconnect the A19 headlight ECU sub-assembly LH connector.
HINT:
Since the headlight ECU sub-assembly LH uses waterproof connectors, the voltage, resistance and waveform cannot be checked directly. The voltage, resistance and waveform are indicated for reference only.
(d) Measure the voltage according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| A19-16 (SBR) - A19-15 (SGR) | R - P | Rear height control sensor power supply | Power switch on (IG) | Approximately 5 V |
| A19-17 (SHRL) - A19-15 (SGR) | L - P | Rear height control sensor signal input | (No passengers, no luggage, vehicle not moving) | Approximately 2.5 V (vehicle level) (value decreases as the front of the vehicle is raised) |
CHECK HEADLIGHT ECU SUB-ASSEMBLY RH
(a) Disconnect the A20 headlight ECU sub-assembly RH connector.
(b) Measure the resistance and voltage according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| A20-4 (IG) - Body ground | G - Body ground | Ignition power supply | Power switch off | Below 1 V |
| Power switch on (IG) | 11 to 14 V | |||
| A20-13 (ECUB) - Body ground | B - Body ground | Power supply | Power switch off | Below 1 V |
| Power switch on (IG) | 11 to 14 V | |||
| A20-12 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 Ω |
CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY, MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
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