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<!-- DFIN New ActiveDisclosure (SM) XBRL Schema Document - http://www.dfinsolutions.com/ -->
<!-- Creation Date :2023-07-24T19:08:26.2435+00:00 -->
<!-- Copyright (c) 2023 Donnelly Financial Solutions, Inc. All Rights Reserved. -->
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  <xsd:element id="cts_USDollarDenominatedDebtMember" name="USDollarDenominatedDebtMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_RevolvingCreditFacilityDue2024Member" name="RevolvingCreditFacilityDue2024Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_PensionAndOtherPostretirementExpenseIncome" name="PensionAndOtherPostretirementExpenseIncome" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="cts_TwoThousandNinePlanMember" name="TwoThousandNinePlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_TransportationMember" name="TransportationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNonCashCharges" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentNonCashCharges" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="cts_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentOtherthanOptionsMaximumPotentialOutstanding" name="SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentOtherthanOptionsMaximumPotentialOutstanding" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="cts_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentOtherthanOptionsAttainedbyPerformance" name="SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentOtherthanOptionsAttainedbyPerformance" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="cts_RevolvingCreditFacilityDue2020LetterOfCreditSublimitMember" name="RevolvingCreditFacilityDue2020LetterOfCreditSublimitMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_OtherAssetsNoncurrentExcludingPropertyPlantAndEquipmentNetAndOperatingLeaseAssetsNet" name="OtherAssetsNoncurrentExcludingPropertyPlantAndEquipmentNetAndOperatingLeaseAssetsNet" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="cts_FerropermAcquisitionMember" name="FerropermAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_ReimbursementCostsAndInterest" name="ReimbursementCostsAndInterest" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="cts_StatusOfEquityBasedCompensationPlansTableTextBlock" name="StatusOfEquityBasedCompensationPlansTableTextBlock" type="dtr-types:textBlockItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="cts_ContingentConsiderationMember" name="ContingentConsiderationMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsReleasedNumber" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsReleasedNumber" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="cts_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsIncludingGoodwill" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="cts_DefinedBenefitPlanAssetsTransferExciseTax" name="DefinedBenefitPlanAssetsTransferExciseTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="cts_UnitedStatesEnvironmentalProtectionAgencyMember" name="UnitedStatesEnvironmentalProtectionAgencyMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentInventorySold" name="BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentInventorySold" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="cts_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentOtherthanOptionsAttainedbyPerformanceWeightedAverageGrantDateFairValue" name="SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentOtherthanOptionsAttainedbyPerformanceWeightedAverageGrantDateFairValue" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="cts_QualifiedReplacementPlanAssets" name="QualifiedReplacementPlanAssets" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="cts_DefinedContributionPlanInvestmentPercentage" name="DefinedContributionPlanInvestmentPercentage" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="cts_ForeignCurrencyDenominatedDebtMember" name="ForeignCurrencyDenominatedDebtMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_TwoThousandFourteenPlanMember" name="TwoThousandFourteenPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_LineOfCreditFacilityContingentIncreaseToMaximumBorrowingCapacity" name="LineOfCreditFacilityContingentIncreaseToMaximumBorrowingCapacity" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="cts_AshishAgrawalMember" name="AshishAgrawalMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_AerospaceandDefenseMember" name="AerospaceandDefenseMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_ShutDownMember" name="ShutDownMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_AccruedExpensesAndOtherLiabilitiesMember" name="AccruedExpensesAndOtherLiabilitiesMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_VariableRateDebtMember" name="VariableRateDebtMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_TEWATemperatureSennsorsSPZoOMember" name="TEWATemperatureSennsorsSPZoOMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_ServiceBasedRestrictedStockUnitsMember" name="ServiceBasedRestrictedStockUnitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_RevolvingCreditFacilityDue2020SwinglineSublimitMember" name="RevolvingCreditFacilityDue2020SwinglineSublimitMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_NumberOfSitesUnderNationalPrioritiesListOfSuperfundProgram" name="NumberOfSitesUnderNationalPrioritiesListOfSuperfundProgram" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="cts_PerformanceandMarketbasedRestrictedStockUnitsMember" name="PerformanceandMarketbasedRestrictedStockUnitsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_FerropermPiezoceramicsAsAcquisitionMember" name="FerropermPiezoceramicsAsAcquisitionMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_AccumulatedOtherComprehensiveIncomeLossTax" name="AccumulatedOtherComprehensiveIncomeLossTax" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="cts_VariableRateDebt" name="VariableRateDebt" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="cts_September2020PlanMember" name="September2020PlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_TwoThousandFourPlanMember" name="TwoThousandFourPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_TelecomAndItMember" name="TelecomAndItMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_DirectorsPlanMember" name="DirectorsPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsReleasable" name="SharebasedCompensationArrangementbySharebasedPaymentAwardNonOptionEquityInstrumentsReleasable" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="cts_IncreaseDecreaseInOperatingRightOfUseAsset" name="IncreaseDecreaseInOperatingRightOfUseAsset" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit"/>
  <xsd:element id="cts_NumberOfEquityBasedCompensationPlan" name="NumberOfEquityBasedCompensationPlan" type="xbrli:integerItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="cts_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour" name="FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFour" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="cts_Rule10B51SalesPlanMember" name="Rule10B51SalesPlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_TreasurySharesAuthorizedtobePurchased" name="TreasurySharesAuthorizedtobePurchased" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="cts_NonCashInventoryCharges" name="NonCashInventoryCharges" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="cts_A2018PlanMember" name="A2018PlanMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_CashSettledAwardsMember" name="CashSettledAwardsMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_DefinedBenefitPlanTerminationProcessDescription" name="DefinedBenefitPlanTerminationProcessDescription" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="cts_MedicalMember" name="MedicalMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_InterestRatePlusAnApplicableMargin" name="InterestRatePlusAnApplicableMargin" type="dtr-types:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false"/>
  <xsd:element id="cts_FerropermPiezoceramicsASMember" name="FerropermPiezoceramicsASMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlansSettlementCharges" name="AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPlansSettlementCharges" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="cts_ReimbursementExpectToPotentialExposure" name="ReimbursementExpectToPotentialExposure" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit"/>
  <xsd:element id="cts_AccumulatedOtherComprehensiveLossIncomeBeforeTaxRollForward" name="AccumulatedOtherComprehensiveLossIncomeBeforeTaxRollForward" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsReleasableWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsReleasableWeightedAverageGrantDateFairValue" type="dtr-types:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false"/>
  <xsd:element id="cts_IndustrialMember" name="IndustrialMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
  <xsd:element id="cts_AccumulatedOtherComprehensiveIncomeLossTaxRollForwardAbstract" name="AccumulatedOtherComprehensiveIncomeLossTaxRollForwardAbstract" type="xbrli:stringItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="true"/>
</xsd:schema>
