DESCRIPTION
This circuit detects the ignition switch ON 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
Body Electrical > Power Source Control > Clear DTCs(b) Check for DTCs.
Click here
Body Electrical > Power Source Control > Trouble Codes
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 |
---|---|---|---|---|
IG SW |
Ignition switch ON signal |
ON or OFF |
ON: Ignition switch on OFF: Ignition switch off |
- |
Tester Display |
---|
IG SW |
OK:
Normal conditions listed above are displayed.
Result |
Proceed to |
---|---|
OK |
A |
NG |
B |
A |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
3. |
CHECK HARNESS AND CONNECTOR (BATTERY 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 |
|
4. |
CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
(a) Remove the instrument panel junction block assembly.
Click here
(b) Measure the voltage according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Switch Condition |
Specified Condition |
---|---|---|
3D-30 - 3A-15 |
Ignition switch off |
Below 1 Ω |
3D-30 or 3A-15 - Body ground |
Ignition switch off |
10 kΩ or higher |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
5. |
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 - 3D-30 |
Battery not connected to 3A-17 and 3D-3 |
10 kΩ or higher |
3K-1 - 3D-30 |
Battery positive (+) → 3A-17 Battery negative (-) → 3D-3 |
Below 1 Ω |
3A-15 - MB-32 (IG) |
Always |
Below 1 Ω |
OK |
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
NG |
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
Toyota CH-R Service Manual > Occupant Classification System: Terminals Of Ecu
TERMINALS OF ECU
OCCUPANT DETECTION ECU
Terminal No. (Symbol)
Wiring Color
Terminal Description
Condition
Specified Condition
Y5-1 (SVC1) - Y5-5 (SGD1)
R - G
Front in weight detection sensor sub-assembl ...
Toyota CH-R Service Manual > Hazard Warning Switch: Inspection
INSPECTION
PROCEDURE
1. INSPECT HAZARD WARNING SIGNAL SWITCH ASSEMBLY
(a) Check the resistance.
(1) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
Condition
Specified ...