The 2016 quake severely damaged the same Aisin plant, snarling supplies of a key door component used by Toyota that forced it to halt production at assembly plants nationwide.
Some second- and third-tier suppliers that make parts for the biggest "Tier 1" suppliers appeared to have been affected by the quake as well, one industry executive told Reuters.
Denso 6902.T, the world's second-biggest auto parts maker, said one of its suppliers in the area had reported impact from the quake and 13 others were assessing the situation.
Aisin and other Toyota group suppliers are expected to update on the impact when they report first-quarter financial results later on Friday.
Given Japan's proneness to disasters, manufacturers have for decades sought to strengthen the resilience of parts supply. The latest quake will be a test for how robust their efforts have been.
Nissan has suspended some production at its two Kyushu vehicle plants because of delays in parts deliveries, while Mitsubishi Motors 7211.T said it was halting some production at a plant in Okayama, western Japan.
Kumamoto has in recent years also become a global hub for the manufacturing of semiconductors, the tiny components at the heart of products from smartphones and computers to industrial machinery and vehicles.
The world's largest contract chipmaker, Taiwan Semiconductor Manufacturing Co (TSMC) 2330.TW, evacuated personnel from its Kumamoto plant immediately after the quake on Tuesday afternoon but a few hours later said it had begun resuming operations.
Others have been slower.
Chipmaker Renesas 6723.T said it would only be able to resume operations at one of its Kumamoto plants - which had fallen ceiling panels, cracks in walls and some water leaks - in phases from August 5.
Tokyo Electron, a key producer of chip-making equipment, said it was moving to restart production at its factory in the area next week. Sony, which also has a semiconductor plant in Kumamoto, said on Friday that efforts to resume production there were underway.
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