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)
Click here .gif)
READ NEXT:
Diagnosis System
DIAGNOSIS SYSTEM DESCRIPTION (a) Lighting system data and the Diagnostic Trouble Codes (DTCs) can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfunctioni
Dtc Check / Clear
DTC CHECK / CLEAR CHECK FOR DTC (a) Connect the Techstream to the DLC3. (b) Turn the power switch on (IG). (c) Turn the Techstream on. (d) Enter the following menus: Body Electrical / AFS / Trouble Co
Fail-safe Chart
FAIL-SAFE CHART FAIL-SAFE FUNCTION (a) Headlight ECU sub-assembly (1) The headlight ECU sub-assembly stops light operation if the following malfunctions are detected. Malfunction Multi-informatio
SEE MORE:
System Description
SYSTEM DESCRIPTION GENERAL (a) The air conditioning system has the following controls. Control Outline Neural Network Control This control is capable of performing complex control by artificially simulating the information processing method of the nervous system of living organisms in ord
LED Headlight LH Circuit Malfunction (B2430,B2431)
DESCRIPTION The illumination of the low beam headlights is controlled by the main body ECU (multiplex network body ECU). When the headlights are turned on, the main body ECU (multiplex network body ECU) receives a signal from the headlight assembly and detects the illumination condition of the low b
