DESCRIPTION
The main body ECU (multiplex network body ECU) receives switch signals from the power window regulator switch assembly on the front passenger door and activates the door lock motor on each door according to these signals.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Before replacing the main body ECU (multiplex network body ECU), refer to Registration*.
Click here
PROCEDURE
1. |
READ VALUE USING TECHSTREAM (Door Lock SW-Lock, Door Lock SW-Unlock) |
(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 / Main Body / Data List.
(e) Read the Data List according to the display on the Techstream.
Body Electrical > Main Body > Data List
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
---|---|---|---|---|
Door Lock SW-Lock |
Door control switch assembly lock signal |
OFF or ON |
OFF: Lock side of door control switch assembly not pushed ON: Lock side of door control switch assembly pushed |
- |
Door Lock SW-Unlock |
Door control switch assembly unlock signal |
OFF or ON |
OFF: Unlock side of door control switch assembly not pushed ON: Unlock side of door control switch assembly pushed |
- |
Tester Display |
---|
Door Lock SW-Lock |
Door Lock SW-Unlock |
OK:
The Techstream indicates ON or OFF according to the switch operation shown in the table.
OK | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
|
2. |
INSPECT DOOR CONTROL SWITCH ASSEMBLY |
(a) Remove the door control switch assembly.
Click here
(b) Inspect the door control switch assembly.
Click here
NG | ![]() |
REPLACE DOOR CONTROL SWITCH ASSEMBLY
|
|
3. |
CHECK HARNESS AND CONNECTOR (DOOR CONTROL SWITCH ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the 3A and 3D instrument panel junction block assembly connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
I9-2 (UL) - 3A-39 |
Always |
Below 1 Ω |
I9-4 (L) - 3D-16 |
Always |
Below 1 Ω |
I9-5 (E) - Body ground |
Always |
Below 1 Ω |
I9-2 (UL) or 3A-39 - Body ground |
Always |
10 kΩ or higher |
I9-4 (L) or 3D-16 - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
4. |
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
(a) Remove the instrument panel junction block assembly.
Click here
(b) Remove the main body ECU (multiplex network body ECU).
*a |
Component without harness connected (Instrument Panel Junction Block Assembly) |
- |
- |
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
MB-22 (UL1) - 3A-39 |
Always |
Below 1 Ω |
MB-20 (L1) - 3D-16 |
Always |
Below 1 Ω |
OK | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
NG | ![]() |
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
Toyota CH-R Owners Manual > Child restraint systems: When using a child restraint system
■ When installing a child restraint system to a front passenger seat
For the safety of a child, install a child restraint system to a rear seat.
When installing child restraint system to a front passenger seat is unavoidable,
adjust the seat as follows and install the child restraint system.
...
Toyota CH-R Service Manual > Airbag System: System Diagram
SYSTEM DIAGRAM
Communication Table
Transmitting ECU
(Transmitter)
Receiving ECU
Signal
Communication Method
Airbag Sensor Assembly
ECM
Crash detection signal
CAN
...