Toto spares, Toto parts, Toto spare parts, Spare code no : TCM1158-2 - asst operating substrate assy...

Toto spares, Toto parts, Toto spare parts, Spare code no : TCM1158-2 - asst operating substrate assy.

• There is a listing for TCM1158 described as (which translates from Japanese very roughly as “auxiliary control substrate assembly”).
• The “-2” suffix likely indicates a variant (revision, colour, region spec) of part number TCM1158.
• It appears to be a circuit board/ control board associated with TOTO electric toilet / washlet parts, rather than a purely mechanical part. 
• It is listed on Japanese retail-site (Rakuten) under TOTO with part number TCM1158. 
• A Taiwan TOTO parts list shows TCM1158 described as (auxiliary IC) for model TCF812T etc. 
• The full specification (e.g., exact dimensions, connector type, wiring, whether it includes buttons, LEDs, etc) is not publicly detailed in my search.
• “ASS’T OPERATING SUBSTRATE ASSY” suggests it is a “sub‐assembly” (i.e., board + perhaps components + connectors) but exact function in the equipment is not clearly documented in the public listings I found.
• Whether “-2” means a particular revision, colour code, region variant, or compatible model list is not clear from available listings.
• No official TOTO English spec sheet for TCM1158-2 that I found so far giving full details (datasheet style) on that part.

🔍 What you should check / ask when ordering

When sourcing or verifying this part for your application, I recommend the following checks:

1. Model compatibility: Confirm the exact model of the TOTO equipment (e.g., washlet model, toilet seat bidet model) where this substrate is used. OEM parts often vary by batch or version.
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3. Revision number / suffix: If ordering “TCM1158-2”, verify with supplier whether this is different from “TCM1158-1” or “TCM1158” base version. Ask for drawing or version info.
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5. Connector & wiring layout: Ensure the substrate fits your unit’s wiring harness & connectors, and that mounting points are correct.
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7. Function description: Ask what “ASS’T OPERATING SUBSTRATE ASSY” covers — e.g., user panel board, control interface board, sensor interface board, etc.
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9. Origin & authenticity: Given some parts listings are from Japanese/ Taiwanese market, ensure you get the right region variant (voltage, plug type etc) for your deployment in India (Chennai).
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11. Availability & lead time: Some TOTO parts can have longer lead times or be region‐exclusive.
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13. Price & packaging: Compare packaging (to ensure it’s genuine) and price to typical market rates for TOTO OEM parts in India.

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