| Last Modified: 12-11-2024 | 6.11:8.1.0 | Doc ID: RM100000002OO4M |
| Model Year Start: 2025 | Model: GR Corolla | Prod Date Range: [09/2024 - ] |
| Title: GF1A (TRANSFER / 4WD / AWD): ACTIVE TORQUE SPLIT AWD SYSTEM: AWD Control Switch Circuit; 2025 MY Corolla Corolla Hatchback GR Corolla [09/2024 - ] | ||
|
AWD Control Switch Circuit |
DESCRIPTION
The AWD control switch (No. 2 combination switch assembly) change signal is sent to the 4WD ECU assembly, and then a mode change request signal is sent from the 4WD ECU assembly to the combination meter assembly via CAN communication.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
When the 4WD ECU assembly is replaced, before removing the 4WD ECU assembly, it is necessary to perform ECU Data Save to save the original 4WD ECU assembly information.
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![2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [09/2022 - ]; GF1A (TRANSFER / 4WD / AWD): ACTIVE TORQUE SPLIT AWD SYSTEM: CALIBRATION](/t3Portal/stylegraphics/info.gif)
PROCEDURE
|
1. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Using the GTS, check for DTCs.
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(b) Check that DTCs indicating a CAN communication system malfunction are not output.
|
Result |
Proceed to |
|---|---|
|
DTCs are not output |
A |
|
DTCs are output |
B |
| B |
|
|
|
2. |
READ VALUE USING GTS (4WD MODE SWITCH) |
(a) Read the Data List according to the display on the GTS.
Chassis > Four Wheel Drive > Data List
|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
4WD Mode Switch Front |
AWD control switch (No. 2 combination switch assembly) is in NORMAL mode |
OFF / ON |
OFF: Mode other than NORMAL ON: NORMAL mode |
- |
|
4WD Mode Switch Rear |
AWD control switch (No. 2 combination switch assembly) is in GRAVEL mode |
OFF / ON |
OFF: Mode other than GRAVEL ON: GRAVEL mode |
- |
|
4WD Mode Switch Track |
AWD control switch (No. 2 combination switch assembly) is in TRACK mode |
OFF / ON |
OFF: Mode other than TRACK ON: TRACK mode |
- |
Chassis > Four Wheel Drive > Data List
|
Tester Display |
|---|
|
4WD Mode Switch Front |
|
4WD Mode Switch Rear |
|
4WD Mode Switch Track |
OK:
The display changes in accordance with the operation of the AWD control switch.
| OK |
|
GO TO METER / GAUGE SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
|
|
3. |
INSPECT AWD CONTROL SWITCH (NO. 2 COMBINATION SWITCH ASSEMBLY) |
Click here
| NG |
|
REPLACE AWD CONTROL SWITCH (NO. 2 COMBINATION SWITCH ASSEMBLY) |
|
|
4. |
CHECK HARNESS AND CONNECTOR (4WD ECU ASSEMBLY - AWD CONTROL SWITCH (NO. 2 COMBINATION SWITCH ASSEMBLY)) |
(a) Turn the ignition switch off.
(b) Disconnect the O177 4WD ECU assembly connector.
(c) Disconnect the I179 AWD control switch (No. 2 combination switch assembly) connector.
(d) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
O177-18 (OMS) - I179-6 (B) |
Always |
Below 1 Ω |
|
O177-19 (OMSG) - I179-3 (E) |
Always |
Below 1 Ω |
|
O177-18 (OMS) or I179-6 (B) - Body ground |
Always |
10 kΩ or higher |
|
O177-19 (OMSG) or I179-3 (E) - Body ground |
Always |
10 kΩ or higher |
|
O177-18 (OMS) or I179-6 (B) - O177-19 (OMSG) or I179-3 (E) |
Always |
10 kΩ or higher |
| OK |
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
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