Toyota Corolla Cross: IG Signal Circuit
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:
- Inspect the fuses for circuits related to this system before performing the following procedure.
- First, check for smart key system (for Start Function) DTCs, and after confirming that there is no malfunction, proceed with troubleshooting.*1
for HEV Model: Click here
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for Gasoline Model: Click here
- Before replacing the main body ECU (multiplex network body ECU), refer to Registration.*1
- *1: w/ Smart key System
PROCEDURE
|
1. | READ VALUE USING GTS |
(a) Read the Data List according to the display on the GTS.
Body Electrical > Main Body > Data List|
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
IGR Power | Ignition switch ON signal |
OFF or ON | OFF: Ignition switch off ON: Ignition switch ON |
- |
|
Tester Display |
|---|
| IGR Power |
OK:
Normal conditions listed above are displayed.
| OK | .gif) | PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE |
|
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| 2. |
CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - POWER SOURCE) |
(a) Disconnect the 8C and 8K power distribution box assembly connectors.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
8K-1 - Body ground | Ignition switch off |
11 to 14 V |
|
8C-17 - Body ground | Ignition switch off |
Below 1 V |
|
8C-17 - Body ground | Ignition switch ON |
11 to 14 V |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 3. |
CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - BODY GROUND) |
(a) Disconnect the 8B and 8C power distribution box assembly connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
8B-36 - Body ground | Always |
Below 1 Ω |
|
8C-41 - Body ground | Always |
Below 1 Ω |
| NG | | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 4. |
INSPECT POWER DISTRIBUTION BOX ASSEMBLY |
|
*a | Component without harness connected (Power Distribution Box Assembly) |
- | - |
(a) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|---|---|---|
|
8B-36 - MB-13 (GND1) |
Always | Below 1 Ω |
|
8C-41 - MB-14 (GND2) |
Always | Below 1 Ω |
|
8K-1 - MB-27 (IGR) | Auxiliary battery not connected to 8C-17 - 8B-36 or 8C-41 |
10 kΩ or higher |
|
8K-1 - MB-27 (IGR) | Auxiliary battery positive (+) → 8C-17 Auxiliary battery negative (-) → 8B-36 or 8C-41 |
Below 1 Ω |
| OK | | REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) |
| NG | | REPLACE POWER DISTRIBUTION BOX ASSEMBLY |
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Brake Actuator Operation Sound is Loud during Initial Check
PROCEDURE
1.
PERFORM ROAD TEST
(a) After turning the ignition switch to ON, compare the operating
sound of the brake actuator the first time the vehicle speed reaches 45 km/h (28
mph) with a known good vehicle of the same model.
OK:
The operating sound is the
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DESCRIPTION The cause of the malfunction may be the high-voltage circuit of the motor.
Check the motor internal resistance and the connection condition of the high-voltage line between the inverter and motor to check whether there is an open or short circuit. Related Parts Check
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