What is the reason for the abnormal flashing of the Toyota AC switch?
2 Answers
Toyota AC switch abnormal flashing may be caused by the compressor protection device tripping. The compressor overload protection tripping indicates that the system's high pressure is too high or the current is too large. If the high pressure is too high or overheating, the reasons are as follows: 1. Too much refrigerant: appropriately reduce the refrigerant amount. 2. Poor heat dissipation: check if the condenser pipe is dirty and clean the condenser. 3. Blockage in the pipeline system: refer to the pressure gauge to judge, eliminate, and reprocess the system. 4. Dust and scale accumulation on the evaporator or filter: reduced airflow, abnormal system pressure and temperature, clean the evaporator or filter. 5. Lack of refrigerant: when there is a lack of refrigerant, the compressor exhaust temperature will overheat, causing the overheating load protection switch to trip. If it is a circuit problem, the reasons are as follows: 1. Control circuit board failure. 2. Temperature sensor overload, incorrect information. 3. Loose power wiring, poor contact. 4. Start capacitor or compressor start coil burned out.
I've been repairing automotive electronic devices for over a decade. The flashing Toyota AC switch is usually caused by poor circuit contact or oxidation of internal switch contacts. This is particularly common in humid weather or older vehicles, where moisture infiltration leads to metal rusting and thinning, causing unstable current flow that results in flickering. It could also be due to loose wiring connectors - try gently wiggling the switch or connectors to see if the behavior changes. Don't overlook voltage instability either; check battery status to ensure normal voltage around 12.6 volts, as levels too low or high can affect control signals. Never attempt forced circuit repairs - first scan for trouble codes using a diagnostic tool to identify the root cause before repairing to avoid damaging the entire system. While not an emergency, prolonged neglect may lead to AC failure, compromising comfort and increasing safety risks.
