Lexus NX: Terminals Of Ecu
TERMINALS OF ECU
OCCUPANT DETECTION ECU
HINT:
Since the occupant detection ECU uses waterproof connectors, the voltage and waveform cannot be inspected directly. Standard voltage and waveforms are indicated for reference only.
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| f14-1 (SVC1) - f14-5 (SGD1) | R - G | Front occupant classification sensor LH power supply | Power switch on (IG) | 4.9 to 5.1 V |
| f14-2 (SVC3) - f14-6 (SGD3) | GR - W | Rear occupant classification sensor LH power supply | Power switch on (IG) | 4.9 to 5.1 V |
| f14-3 (SIG1) - f14-5 (SGD1) | P - G | Front occupant classification sensor LH signal | Power switch on (IG) | Pulse generation |
| f14-4 (SIG3) - f14-6 (SGD3) | SB - W | Rear occupant classification sensor LH signal | Power switch on (IG) | Pulse generation |
| f14-5 (SGD1) - f15-3 (GND) | G - W-B | Front occupant classification sensor LH ground | Always | Below 1 V |
| f14-6 (SGD3) - f15-3 (GND) | W - W-B | Rear occupant classification sensor LH ground | Always | Below 1 V |
| f15-1 (+B) - f15-3 (GND) | W - W-B | Power source (+B) | Power switch off | 11 to 14 V |
| f15-2 (DIA) | GR | Diagnosis (DLC3) | -* | -* |
| f15-3 (GND) - Body ground | W-B - Body ground | Ground | Always | Below 1 V |
| f15-4 (FSR-) - f15-3 (GND) | LG - W-B | Airbag ECU assembly communication signal | Always | Below 1 V |
| f15-5 (BGND) - f15-3 (GND) | P - W-B | Front Passenger side buckle switch ground | Always | Below 1 V |
| f15-6 (IG2) - f15-3 (GND) | B - W-B | Power source (IG) | Power switch on (IG) | 11 to 14 V |
| f15-7 (FSR+) - f15-4 (FSR-) | L - LG | Airbag ECU assembly communication signal | Power switch on (IG) | Pulse generation |
| f15-8 (BSW) - f15-5 (BGND) | G - P | Front Passenger side buckle switch signal | Always | Pulse generation |
- *: As this is a line that is connected to other systems, voltage changes according to the systems that are connected.
AIRBAG ECU ASSEMBLY
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Diagnosis System
DIAGNOSIS SYSTEM CHECK DLC3 (a) Check the DLC3. Click here FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR (a) Initial check (1) Turn the power switch on (IG). (2) The passenger airbag ON/OFF indicat
Dtc Check / Clear
DTC CHECK / CLEAR DTC CHECK (a) Turn the power switch off. (b) Connect the Techstream to the DLC3. (c) Turn the power switch on (IG). (d) Turn the Techstream on. (e) Enter the following menus: Body El
Fail-safe Chart
FAIL-SAFE CHART FAIL SAFE FUNCTION (a) The following chart shows the status of the controls when the system is normal and malfunctioning.
The passenger airbag ON/OFF indicator ("ON" and "OFF") come
SEE MORE:
On-vehicle Inspection
ON-VEHICLE INSPECTION CAUTION / NOTICE / HINT NOTICE: DTCs may be stored during the inspection procedure. Be sure to clear the DTCs and check that no DTCs are output after the inspection is finished. PROCEDURE 1. INSPECT PRESSURE SENSOR (a) Check auxiliary battery voltage. Standard voltage: 11 to 1
Installation
INSTALLATION PROCEDURE 1. INSTALL TIRE PRESSURE WARNING ECU AND RECEIVER (a) Connect the connector to the tire pressure warning ECU and receiver. (b) Attach the 2 guides to temporarily install the tire pressure warning ECU and receiver. (c) Install the bolt. Torque: for bolt A : 8.3 N·m {85 kg
