Toto Spares, Toto Parts, Toto spare parts, Spare code no : TCM1158-2 - asst operating substrate assy.
Here’s a summary of what I found about TCM1158-2 Asst Operating Substrate Assy, what it likely is, and how it is used (or intended to be used) among TOTO sanitary / washlet products.
🔍 What is “Asst Operating Substrate Assy”
- The part number TCM1158-2 appears in spare-parts lists for TOTO “Washlet” / automatic-bidet / smart-toilet type products. bechennai.com
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- The description “Asst Operating Substrate Assy” suggests it is a substrate (i.e. circuit board / base plate) assembly that supports operating electronics/components — likely part of the control/electronics inside a Washlet toilet seat or smart toilet. bechennai.com
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- In the context of TOTO’s product breakdowns, this substrate assembly sits along with other parts like “Pump Unit”, “Valve Unit”, “Heated Seat Unit”, “Sensor / Body-detecting Sensor”, “Nozzle Unit”, “Controller Assembly”, etc. bechennai.com
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Thus, TCM1158-2 is not a plumbing part like a flush valve or gasket — it's part of the internal electronics/control system used in automatic-function toilets / Washlets.
🚽 What TOTO Products Use It
- The part shows up under spares for at least the TOTO “Washlet” models (for example, under a listing for “TCF4732A#NW1 WASHLET (D Shape)” on one spare-parts site. bechennai.com
- It appears along with other modules such as pump unit, flexible hose, valve units — which are all typical components for an electronic toilet seat / bidet system. bechennai.com
- According to import/export data (in one listing), TCM1158-2 is labelled as “TOTO SANITARYWARE & FITTINGS” and associated with “WASHLET (automatic regulation Washlet)” products.
So it's used in TOTO’s “smart/bidet/Washlet” toilets, not in the standard gravity-flush ceramic toilets.
⚙️ What “Operating Substrate Assembly” Likely Does
Given the context, this part probably serves as the main control or electronic substrate that:
- Hosts the control circuitry for the Washlet (controls water spray, bidet functions, seat heating, possibly sensor inputs).
- Connects other functional modules — e.g. water pump, nozzle unit, valves, sensor unit, seat heating.
- Enables automatic / electronic operations (as opposed to manual flushing or manual bidet) — so failure of this substrate likely disables all electronic/automatic functions (bidet spray, heated seat, sensor-based control).
In other words: the “brain / backbone” of the Washlet’s electronics.
✅ What to Check / Know If You’re Replacing or Using This Spare
- Ensure that your toilet / Washlet model matches — this part is not for regular toilets; only for certain TOTO Washlet / electronic-toilet models.
- If the Washlet’s electronic/bidet/heating/sensor functions have failed, replacing this assembly might restore those features (provided no other modules are damaged).INDIA
- Because it's a complex electronic part (not just a simple mechanical component), installation or replacement ideally should be done carefully — best via a technician or someone familiar with TOTO’s toilet-electrical systems. DUBAI.
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