Tech Tips
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.
| Symptom | Suspected Area | See page |
|---|---|---|
| System does not operate normally even when DTCs are not output | Power source circuit | |
| Pre-crash system cancel switch circuit | ||
| Only pre-crash brake operation is not performed | Driving support ECU assembly | |
| Skid control ECU (for LHD) | ||
| Skid control ECU (for RHD) | ||
| Although there is no possibility of crash, pre-crash controls (all front crash controls) operate | Proceed to "Cases of Unnecessary Pre-crash System Operation" (Although there is no possibility of crash, the millimeter wave radar sensor detects an object and activates the pre-crash system) | |
| Check installation condition of millimeter wave radar sensor | ||
| Perform millimeter wave radar sensor adjustment | ||
| Millimeter wave radar sensor | ||
| Driving support ECU assembly | ||
| Although there is possibility of crash, pre-crash controls (all front crash controls) do not operate | Pre-crash system cancel switch circuit | |
| Vehicle condition/environment does not match pre-crash control operation conditions (Confirm control operation conditions) | ||
| Check installation condition of millimeter wave radar sensor | ||
| Perform millimeter wave radar sensor adjustment | ||
| Millimeter wave radar sensor | ||
| Driving support ECU assembly | ||
| Pre-crash system OFF does not operate | LED (perform Active test) | |
| Pre-crash system cancel switch circuit | ||
| Combination meter sub-assembly | ||
| Skid control ECU (for LHD) | ||
| Skid control ECU (for RHD) | ||
| Pre-crash system cannot be canceled (PCS warning light does not illuminate) | Combination meter assembly (Check if indicator illuminates using Active Test) | |
| Pre-crash system cancel switch circuit | ||
| Driving support ECU assembly | ||
| Pre-crash sensitivity switching function cannot be operated (Pre-crash system sensitivity indicator is not displayed) | Pre-crash system cancel switch circuit | |
| Combination meter sub-assembly | ||
| Driving support ECU assembly |