DESCRIPTION
The main body ECU (multiplex network body ECU) controls operation of the DOME CUT relay in order to supply power to the interior lights. When the battery saving function operates while the interior lights are on, the main body ECU (multiplex network body ECU) opens the DOME CUT relay to turn off the lights.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
PROCEDURE
1. |
PERFORM ACTIVE TEST 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 / Main Body / Active Test.
(e) Perform the Active Test according to the display on the Techstream.
Body Electrical > Main Body > Active Test
Tester Display |
Measurement Item |
Control Range |
Diagnostic Note |
---|---|---|---|
Relay for Interior Light Auto Cut Function |
DOME CUT relay |
ON or OFF |
When performing this active test, turn all the interior lights on.
|
Tester Display |
---|
Relay for Interior Light Auto Cut Function |
OK:
All of the interior lights turn off when ON is selected.
OK | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
|
|
2. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(a) Disconnect the 3K instrument panel junction block assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
3K-1 - Body ground |
Always |
11 to 14 V |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
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) from the instrument panel junction block assembly.
Click here
(c) Measure the voltage and resistance according to the value(s) in the table below.
*a |
Component without harness connected (Instrument Panel Junction Block Assembly) |
- |
- |
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
3H-19 - Battery negative terminal |
Battery positive (+) → 3K-1 Battery negative (-) → MB-23 (DOMR) |
11 to 14 V |
3D-9 - Battery negative terminal |
Battery positive (+) → 3K-1 Battery negative (-) → MB-23 (DOMR) |
11 to 14 V |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
3K-1 - 3H-19 |
Always |
10 kΩ or higher |
3K-1 - 3D-9 |
Always |
10 kΩ or higher |
OK | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
NG | ![]() |
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
Toyota CH-R Service Manual > Vehicle Stability Control System: How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
*: Use the Techstream.
PROCEDURE
1.
VEHICLE BROUGHT TO WORKSHOP
NEXT
2.
CUSTOMER PROBLEM ANALYSIS
(a) Interview the customer and confir ...
Toyota CH-R Service Manual > Airbag System: Side Airbag Sensor Assembly No.2 Lost Communication (RH) (B162B/85,B162C/85)
DESCRIPTION
The side collision sensor RH circuit (bus 2) consists of the airbag sensor assembly
and floor side airbag sensor RH.
The floor side airbag sensor RH detects impacts to the vehicle and sends signals
to the airbag sensor assembly to determine if the airbags and pretensioners should
...