TERMINALS OF ECU
CHECK TIRE PRESSURE WARNING ECU AND RECEIVER
(a) Disconnect the M23 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 |
---|---|---|---|---|
M23-1 (IG) - M23-12 (GND) |
SB - W-B |
IG power source |
Ignition switch to ON |
10 to 16 V |
M23-7 (+B) - M23-12 (GND) |
R - W-B (*1) B - W-B (*2) |
Power supply (from battery) |
Always |
10 to 16 V |
M23-12 (GND) - Body ground |
W-B - Body ground |
Ground |
Always |
Below 1 Ω |
(b) Connect the M23 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.
*a |
Component with harness connected (Tire Pressure Warning ECU and Receiver) |
- |
- |
Terminal No. (Symbol) |
Wiring Color |
Terminal Description |
Condition |
Specified Condition |
---|---|---|---|---|
M23-3 (CLSW) - M23-12 (GND) |
Y - W-B |
Tire pressure warning reset switch |
|
Below 1.5 V |
|
8 to 15 V |
|||
M23-4 (RDA) - M23-12 (GND) |
G - W-B |
Output signals |
Ignition switch to ON |
Pulse generation (see waveform 1) |
M23-5 (PRG) - M23-12 (GND) |
W - W-B |
Input signals |
Ignition switch to ON |
Pulse generation (see waveform 1) |
(d) Using an oscilloscope, check waveform 1.
*a |
Example |
*b |
GND |
Item |
Contents |
---|---|
Terminal |
M23-4 (RDA) - M23-12 (GND) M23-5 (PRG) - M23-12 (GND) |
Tool setting |
5 V/DIV, 5 ms./DIV. |
Vehicle condition |
Ignition switch to ON |
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.
Toyota CH-R Service Manual > Tire Pressure Warning System: Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART
Tire Pressure Warning ECU and Receiver
DTC No.
Detection Item
Note
Link
B1247
Tire Pressure Monitor Receiver Communication Stop
This DTC is for main body ECU (multiplex network body ECU ...
Toyota CH-R Owners Manual > Dynamic radar cruise control with full-speed range: Selecting constant speed control mode
When constant speed control mode is selected, your vehicle will maintain a set
speed without controlling the vehicle-to-vehicle distance.
Select this mode only when vehicle-to-vehicle distance control mode does not
function correctly due to a dirty radar sensor, etc.
1. With the cruise control ...