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 > Seat Belt Warning System(w/o Occupant Classification System): 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 sy ...
Toyota CH-R Service Manual > Horn System: Precaution
PRECAUTION
IGNITION SWITCH EXPRESSION
HINT:
The type of ignition switch used on this model differs according to the specifications
of the vehicle. The expressions listed in the table below are used in this section.
Expression
Ignition Switch (Position)
Engine S ...