TERMINALS OF ECU
1. CHECK TIRE PRESSURE WARNING ECU AND RECEIVER
(a) Disconnect the T14 tire pressure warning ECU and receiver connector and measure the voltage and resistance on the wire harness side.
*A |
w/o Wireless Door Lock System |
*B |
w/o Smart Key System with Wireless Door Lock System |
*C |
w/ Smart Key System |
*a |
Front view of wire harness connector (to Tire Pressure Warning ECU and Receiver) |
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
T14-1 (IG) - T14-12 (GND) |
LG - W-B |
IG power source |
Ignition switch ON |
10 to 16 V |
T14-12 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
T25-1 (IG) - T25-12 (GND) |
LG - W-B |
IG power source |
Ignition switch ON |
10 to 16 V |
T25-7 (+B) - T25-12 (GND |
BE - W-B |
Power supply (from battery) |
Always |
10 to 16 V |
T25-12 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
T24-1 (IG) - T24-12 (GND) |
LG - W-B |
IG power source |
Ignition switch ON |
10 to 16 V |
T24-7 (+B) - T24-12 (GND) |
BE - W-B |
Power supply (from battery) |
Always |
10 to 16 V |
T24-12 (GND) - Body ground*1 |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
(b) Connect the T14*1, T25*2, T24*3 tire pressure warning ECU and receiver connector.
(c) Measure the voltage and resistance 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.
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
T14-3 (CLSW) - T14-12 (GND)*1 T25-3 (CLSW) - T25-12 (GND)*2 T24-3 (CLSW) - T24-12 (GND)*3 |
R - W-B |
Tire pressure warning reset switch |
|
Below 1.5 V |
|
8 to 15 V |
|||
T14-4 (RDA) - T14-12 (GND)*1 T25-4 (RDA) - T25-12 (GND)*2 T24-4 (RDA) - T24-12 (GND)*3 |
B - W-B |
Output signals |
Ignition switch ON |
Pulse generation (see waveform 1) |
T14-5 (PRG) - T14-12 (GND)*1 T25-5 (PRG) - T25-12 (GND)*2 T24-5 (PRG) - T24-12 (GND)*3 |
GR - W-B |
Input signals |
Ignition switch ON |
Pulse generation (see waveform 1) |
(d) Using an oscilloscope, check waveform 1.
Waveform 1:
Item |
Contents |
---|---|
Terminal |
T14-4 (RDA) - T14-12 (GND)*1 T25-4 (RDA) - T25-12 (GND)*2 T24-4 (RDA) - T24-12 (GND)*3 T14-5 (PRG) - T14-12 (GND)*1 T25-5 (PRG) - T25-12 (GND)*2 T24-5 (PRG) - T24-12 (GND)*3 |
Tool setting |
5 V/DIV., 5 ms./DIV. |
Vehicle condition |
Ignition switch ON |
*a |
Example |
*b |
GND |
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.
Power Source Mode does not Change to ON (IG)
DESCRIPTION
If the engine switch is pressed with the electrical key transmitter sub-assembly
in the cabin, the certification ECU (smart key ECU assembly) receives a signal and
changes the power source mode.
HINT:
When the cable is disconnected and reconnected to the negative (-) battery termi ...
Wireless remote control battery
Replace the battery with a new one if it is discharged.
■ You will need the following items:
Lithium battery CR2032
■ Replacing the battery
Remove the cover using a coin protected with tape etc.
Remove the discharged transmitter battery.
Insert a new battery with the “+” te ...
Dtc Check / Clear
DTC CHECK / CLEAR
1. CHECK DTC (CHECK USING TECHSTREAM)
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Navigation System / Trouble
Codes.
(e) Check for DTCs, and then write them down.
( ...