Toyota Venza: IG Signal Circuit
DESCRIPTION
This circuit detects the ignition switch ON or off condition, and sends it to the main body ECU (driver side junction block assembly).
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
PROCEDURE
|
1. |
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 display on the Techstream.
Main Body|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
IG SW |
Ignition switch or engine switch IG signal/ON or OFF |
ON: Ignition switch ON OFF: Ignition switch off |
- |
OK:
Normal conditions listed above are displayed.
| OK | .gif) |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
.gif)
|
2. |
INSPECT NO. 1 IGNITION RELAY |
|
(a) Remove the No. 1 ignition relay from the main body ECU (driver side junction block assembly). |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 - 5 |
When battery voltage is not applied to terminals 1 and 2 |
10 kΩ or higher |
|
When battery voltage is applied to terminals 1 and 2 |
Below 1 Ω |
| NG | |
REPLACE NO. 1 IGNITION RELAY |
|
|
3. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - BATTERY AND BODY GROUND) |
|
(a) Disconnect the 2A main body ECU (driver side junction block assembly) connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2A-1 - Body ground |
Always |
10 to 14 V |
|
*1 |
Front view of wire harness connector (to Main Body ECU (Driver Side Junction Block Assembly)) |
|
(c) Disconnect the 2F main body ECU (driver side junction block assembly) connector. |
|
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2F-16 - Body ground |
Always |
Below 1 Ω |
|
*1 |
Front view of wire harness connector (to Main Body ECU (Driver Side Junction Block Assembly)) |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
4. |
CHECK VEHICLE CONDITION |
(a) Check the vehicle condition.
|
Condition |
Proceed to |
|---|---|
|
w/o Smart Key System |
A |
|
w/ Smart Key System |
B |
| B | |
GO TO STEP 7 |
|
|
5. |
CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - IGNITION SWITCH) |
|
(a) Disconnect the D12 ignition switch connector. |
|
(b) Disconnect the 2G main body ECU (driver side junction block assembly) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2G-10 - D12-2 (AM1) |
Always |
Below 1 Ω |
|
2G-29 - D12-4 (IG1) |
Always |
Below 1 Ω |
|
2G-10 - Body ground |
Always |
10 kΩ or higher |
|
2G-29 - Body ground |
Always |
10 kΩ or higher |
|
*1 |
Front view of wire harness connector (to Main Body ECU (Driver Side Junction Block Assembly)) |
|
*2 |
Front view of wire harness connector: (to Ignition Switch) |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
6. |
INSPECT IGNITION SWITCH |
|
(a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
|
|
| OK | |
REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) |
| NG | |
REPLACE IGNITION SWITCH |
|
7. |
CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - MAIN BODY ECU) |
|
(a) Disconnect the 2G main body ECU (driver side junction block assembly) connector. |
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
2G-29 - Body ground |
Engine switch on (IG) |
11 to 14 V |
|
*1 |
Front view of wire harness connector (to Main Body ECU (Driver Side Junction Block Assembly)) |
| OK | |
REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) |
| NG | |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
Data List / Active Test
DATA LIST / ACTIVE TEST
1. DATA LIST
HINT:
Using the Techstream to read the Data List allows the values or states of switches,
sensors, actuator and other items to be read without removing any pa ...
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WIRING DIAGRAM
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