Lexus ES: Terminals Of Ecu
TERMINALS OF ECU
CHECK TIRE PRESSURE WARNING ECU AND RECEIVER
(a) Disconnect the N8 tire pressure warning ECU and receiver connector and measure the voltage or resistance on the wire harness side.
| *a | Front view of wire harness connector (to Tire Pressure Warning ECU and Receiver) |
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| N8-1 (IG) - N8-12 (GND) | B - BR | IG power source | Power switch on (IG) | 10 to 16 V |
| N8-7 (+B) - N8-12 (GND) | R - BR | Power supply (from auxiliary battery) | Always | 10 to 16 V |
| N8-9 (CANH) - N8-10 (CANL) | L - W | CAN communication line | Power switch off | 54 to 69 Ω |
| N8-12 (GND) - Body ground | BR - Body ground | Ground | Always | Below 1 Ω |
(b) Connect the N8 tire pressure warning ECU and receiver connector.
(c) Measure the voltage according to the value(s) in the table below. If the result is not as specified, the ECU may be malfunctioning.
HINT:
Measure the values on the wire harness side while the connector is connected.
| *a | Component with harness connected (Tire Pressure Warning ECU and Receiver) | - | - |
| Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
|---|---|---|---|---|
| N8-3 (CLSW) - N8-12 (GND) | SB - BR | Tire pressure warning reset switch |
| Below 1.5 V |
| 8 to 15 V | |||
| N8-4 (RDA) - N8-12 (GND) | G - BR | Output signals | Power switch on (IG) | Pulse generation (see waveform 1) |
| N8-5 (PRG) - N8-12 (GND) | V - BR | Input signals | Power switch on (IG) | Pulse generation (see waveform 1) |
(d) Using an oscilloscope, check waveform 1.
| *a | Example |
| *b | GND |
| Item | Contents |
|---|---|
| Terminal | N8-4 (RDA) - N8-12 (GND) N8-5 (PRG) - N8-12 (GND) |
| Tool setting | 5 V/DIV, 5 ms./DIV. |
| Vehicle condition | Power switch on (IG) |
HINT:
The waveform shown in the illustration is an example. If the tester displays a waveform that alternates between high and low, where high is a voltage that is between the IG power source voltage and a voltage 2.2 V lower than the IG power source voltage, and where low is a voltage of between 0 and 1.2 V, the ECU can be judged normal.
READ NEXT:
Diagnosis System
DIAGNOSIS SYSTEM CHECK WARNING LIGHT NOTICE:
When there is a problem with the tire pressure warning system, the tire pressure warning light blinks at 0.5 second intervals, and illuminates after 1 m
Dtc Check / Clear
DTC CHECK / CLEAR CHECK DTC (for TIRE PRESSURE WARNING ECU AND RECEIVER) (a) Turn the power switch off. (b) Connect the Techstream to the DLC3. (c) Turn the power switch on (IG). (d) Turn the Techstre
Fail-safe Chart
FAIL-SAFE CHART FAIL-SAFE FUNCTION (a) When a malfunction occurs in the tire pressure warning system, the tire pressure warning light illuminates after blinking for 1 minute to inform the driver of th
SEE MORE:
Inspection
INSPECTION PROCEDURE 1. INSPECT OUTER REAR VIEW MIRROR ASSEMBLY RH (a) Check the operation of the mirror surface. NOTICE: If the mirror surface is fully turned to the right, left, upward or downward position, the motor slips and produces a clicking noise. This is not a malfunction. (1) Disconnect
Auto Down Operation does not Fully Open Power Window (Catch Protection Function is Activated)
DESCRIPTION If a door glass does not slide smoothly or a power window regulator motor assembly or door window regulator sub-assembly does not operate smoothly, the catch protection function may be triggered automatically, resulting in the auto down operation being unable to fully open the power wind
