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 |
|---|---|---|
| "CHECK PCS SYSTEM" is displayed | Combination meter assembly | |
| Seat belt control ECU | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| "PCS TEMPORARILY NOT AVAILABLE" is displayed | System determines millimeter wave radar sensor assembly cannot detect obstacles due to bad weather. If weather recovers, normal control returns. (Bad weather history can be checked using Data List.) | |
| Overheating protection fail-safe of seat belt control ECU operates. If seat belt motor temperature drops, normal control returns. | - | |
| Millimeter wave radar sensor assembly | ||
| Seat belt control ECU | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Although there is possibility of collision, pre-crash controls (all front crash controls) do not operate ("PCS TEMPORARILY NOT AVAILABLE" is not displayed) | Vehicle condition/environment does not match pre-crash control operation conditions (Confirm control operation conditions) | |
| Check installation condition of millimeter wave radar sensor assembly | ||
| Perform millimeter wave radar sensor assembly adjustment | ||
| Millimeter wave radar sensor assembly | ||
| Seat belt control ECU | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Although there is no possibility of collision, pre-crash controls (all front crash controls) operate | Vehicle condition/environment does not match pre-crash control operation conditions (Confirm control operation conditions) | |
| Check installation condition of millimeter wave radar sensor assembly | ||
| Perform millimeter wave radar sensor assembly adjustment | ||
| Millimeter wave radar sensor assembly | ||
| Seat belt control ECU | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Neither normal system code nor DTC is output | Power source circuit | |
| Seat belt control ECU | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| System does not operate normally even when normal system code is output or DTCs are not output | Power source circuit | |
| Seat belt control ECU | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Only pre-crash seat belt does not operate | Buckle switch error (malfunction in which DTC is not output) | - |
| Seat belt control ECU | ||
| Pre-crash safety system does not operate | Pre-crash system cancel switch assembly | |
| Pre-crash system cancel switch circuit | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Pre-crash safety system cannot be canceled (PCS warning indicator does not illuminate) | Combination meter assembly (check if indicator illuminates using Active Test) | |
| Pre-crash system cancel switch circuit | ||
| Driving support ECU assembly (for LHD) | ||
| Driving support ECU assembly (for RHD) | ||
| Combination meter assembly |