Lexus NX: Terminals Of Ecu
TERMINALS OF ECU
CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
| *1 | Main Body ECU (Multiplex Network Body ECU) | - | - |
(a) Measure the voltage and check for pulses according to the value(s) in the table below.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| I48-1 (DIM) - Body ground | L - Body ground | High beam headlight drive output | Power switch off | Below 1 V |
| Power switch on (IG) | 11 to 14 V | |||
| I48-8 (A) - Body ground | G - Body ground | Light control switch Auto position signal input | Light control switch in Auto position | Below 1 V |
| Light control switch not in Auto position | 11 to 14 V | |||
| I48-23 (AHBI) - Body ground | P - Body ground | Combination switch assembly (automatic high beam main switch) signal input | Combination switch assembly (automatic high beam main switch) on | Below 1 V |
| Combination switch assembly (automatic high beam main switch) off | 11 to 14 V | |||
| I48-24 (HU) - Body ground | Y - Body ground | Headlight dimmer switch high position signal input | Headlight dimmer switch in high position | Below 1 V |
| Headlight dimmer switch not in high position | 11 to 14 V | |||
| I48-19 (CLTB) - I48-21 (CLTE) | W - V | Automatic light control sensor power supply output | Power switch off | Below 1 V |
| Power switch on (IG) | 11 to 14 V | |||
| I48-20 (CLTS) - Body ground | P - Body ground | Automatic light control sensor signal input | Power switch off | Below 1 V |
| Automatic light control system operating | Pulse generation (See waveform 1) |
(b) Waveform 1
| Item | Content |
|---|---|
| Terminal No. (Symbol) | I48-20 (CLTS) - Body ground |
| Tool Setting | 2 V/DIV., 10 ms./DIV. |
| Condition | Automatic light control system operating |
HINT:
The communication waveform changes according to the surrounding brightness.
CHECK FORWARD RECOGNITION CAMERA
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Diagnosis System
DIAGNOSIS SYSTEM DESCRIPTION (a) Automatic high beam system data and Diagnostic Trouble Codes (DTCs) can be read from the Data Link Connector 3 (DLC3) of the vehicle. When the system seems to be malfu
Dtc Check / Clear
DTC CHECK / CLEAR CHECK 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 / Main Body / Trouble
Fail-safe Chart
FAIL-SAFE CHART AUTOMATIC HIGH BEAM SYSTEM (a) The main body ECU (multiplex network body ECU) operates in fail-safe mode if an abnormal condition such as those listed below has been detected. Item
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Problem Symptoms Table
PROBLEM SYMPTOMS TABLE HINT:
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspect
Disassembly
DISASSEMBLY CAUTION / NOTICE / HINT HINT:
Use the same procedure for the RH and LH sides.
The procedure listed below is for the LH side.
PROCEDURE 1. REMOVE FRONT DOOR UPPER OUTSIDE MOULDING PAD (a) Remove the front door upper outside moulding pad.
