DESCRIPTION
This circuit detects the ignition switch ACC or off condition, and sends it to the main body ECU (multiplex network body ECU).
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
PROCEDURE
1. |
CHECK FOR DTC (SMART KEY SYSTEM (for Start Function)) |
HINT:
If the vehicle is not equipped with an smart key system, proceed to next step (A).
(a) Clear the DTCs.
Click here
(b) Check for the DTCs.
Click here
Result |
Proceed to |
---|---|
Smart Key System (for Start Function) DTCs are not output |
A |
Smart Key System (for Start Function) DTCs are output |
B |
B | ![]() |
GO TO SMART KEY SYSTEM (for Start Function) |
|
2. |
READ VALUE 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 / 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 |
---|---|---|---|---|
ACC SW |
Ignition switch ACC signal |
ON or OFF |
ON: Ignition switch ACC OFF: Ignition switch off |
- |
Tester Display |
---|
ACC SW |
OK:
Normal conditions listed above are displayed.
OK | ![]() |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
|
|
3. |
CHECK HARNESS AND CONNECTOR (BATTERY POWER SOURCE) |
(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 |
|
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) from the instrument panel junction block assembly.
Click here
(c) Measure the resistance according to the value(s) in the table below.
*a |
Component without harness connected (Instrument Panel Junction Block Assembly) |
- |
- |
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
3K-1 - MB-30 (ACC) |
Battery not connected to 3A-30 and 3D-3 |
10 kΩ or higher |
3K-1 - MB-30 (ACC) |
Battery positive (+) → 3A-30 Battery negative (-) → 3D-3 |
Below 1 Ω |
OK | ![]() |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
NG | ![]() |
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
Toyota CH-R Service Manual > Airbag System: Short in Driver Side Squib 2nd Step Circuit (B1810/53-B1813/53)
DESCRIPTION
The driver side squib 2nd step circuit consists of the airbag sensor assembly,
spiral cable with sensor sub-assembly and horn button assembly.
The airbag sensor assembly uses this circuit to deploy the airbag when deployment
conditions are met.
These DTCs are stored when a malfunc ...
Toyota CH-R Service Manual > Transmission Control Cable: Precaution
PRECAUTION
IGNITION SWITCH EXPRESSIONS
(a) The type of ignition switch used on this model differs depending on the specifications
of the vehicle. The expressions listed in the table below are used in this section.
Expression
Ignition Switch (Position)
Engine Swi ...