DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT CRAWL SWITCH
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - CRAWL SWITCH)
CHECK TEST MODE DTC
DTC C1379 Downhill Assist Control Switch Malfunction (Test Mode DTC)
DESCRIPTION
DTC C1379 is cleared when the CRAWL switch (suspension control switch) sends a CRAWL switch (suspension control switch) operation signal or when test mode ends.
| DTC Code | DTC Detection Condition | Trouble Area |
| C1379 | Stored only during test mode. | CRAWL switch (Suspension control switch)
Harness or connector
Skid control ECU (Master cylinder solenoid)
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WIRING DIAGRAM
INSPECTION PROCEDURE
- After replacing the master cylinder solenoid, perform zero point calibration and store the system information ().
Remove the CRAWL switch (suspension control switch) ().
Inspect the CRAWL switch (suspension control switch) ().
| | REPLACE SUSPENSION CONTROL SWITCH ()
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| 2.CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - CRAWL SWITCH) |
Disconnect the A24 skid control ECU (master cylinder solenoid) connector.
Disconnect the V4 CRAWL switch (suspension control switch) connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| A24-44 (TRM1) - V4-18 (ECU1) | Always | Below 1 Ω |
| A24-44 (TRM1) - Body ground | Always | 10 kΩ or higher |
| A24-43 (TRS) - V4-14 (HSW) | Always | Below 1 Ω |
| A24-43 (TRS) - Body ground | Always | 10 kΩ or higher |
| A24-21 (TRM2) - V4-19 (ECU2) | Always | Below 1 Ω |
| A24-21 (TRM2) - Body ground | Always | 10 kΩ or higher |
| A24-13 (ATRC) - V4-13 (ECU3) | Always | Below 1 Ω |
| A24-13 (ATRC) - Body ground | Always | 10 kΩ or higher |
| V4-16 (E) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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Perform the CRAWL switch check in the Test Mode procedure ().
- OK:
- Test mode DTC C1379 is cleared.
Result| Result | Proceed to |
| OK | A |
| NG (for LHD) | B |
| NG (for RHD) | C |
| | REPLACE MASTER CYLINDER SOLENOID ()
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| | REPLACE MASTER CYLINDER SOLENOID ()
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| A | |
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| CHECK FOR INTERMITTENT PROBLEMS ()
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