| Manufacturing Capacity |
Dedicated production areas for PCB assembly, wiring harnesses, enclosure assembly, software loading, and final inspection. |
Factory layout, process-flow chart, equipment list, production-line photographs, and an on-site or live video audit. |
Confirms that the supplier controls key processes instead of relying entirely on uncontrolled subcontracting. |
Must Verify |
| Monthly Output Planning |
Capacity should be stated by product model and shift pattern, with separate figures for sample production and mass production. |
Capacity statement showing units per shift, number of shifts, bottleneck operations, and current utilization. |
Prevents a supplier from quoting total theoretical capacity that cannot support the required delivery schedule. |
Must Verify |
| Production Traceability |
Serialized or lot-based records linking incoming materials, operators, test results, firmware version, and shipment carton. |
Redacted traceability record, barcode workflow, lot-control procedure, and sample certificate of conformity. |
Enables faster root-cause analysis and controlled replacement if a field failure occurs. |
High Priority |
| Quality Management |
Documented quality system aligned with ISO 9001:2015 principles; automotive-focused projects benefit from IATF 16949-based controls. |
Valid certificate scope, audit report summary, corrective-action records, incoming inspection plan, and process-control plan. |
Shows whether quality activities are systematic, documented, and subject to continual improvement. |
High Priority |
| Automotive EMC Testing |
Testing should address applicable vehicle electromagnetic compatibility requirements, such as UN ECE R10 where required, plus customer-specific limits. |
Test reports from a competent laboratory, test setup, sample configuration, software version, and pass/fail criteria. |
Reduces risks of radio interference, malfunction, or incompatibility with the vehicle electrical system. |
Must Verify |
| Conducted Transient Immunity |
Automotive power-input testing should consider ISO 7637-2 pulse conditions when applicable to the product and vehicle architecture. |
Test report identifying pulse levels, polarity, duration, source impedance, operating mode, and functional-performance criteria. |
Helps verify resistance to load switching and electrical transients on 12 V or 24 V vehicle networks. |
Must Verify |
| Environmental Reliability |
Validation should cover temperature cycling, high and low temperature operation, vibration, humidity, and mechanical shock according to the agreed product specification. |
Reliability test matrix, sample size, duration, acceptance criteria, failure analysis, and retest records. |
Car interiors expose audio equipment to temperature changes, vibration, condensation, and long operating periods. |
High Priority |
| Audio Performance |
Use defined measurements for frequency response, total harmonic distortion, signal-to-noise ratio, channel balance, output power, and microphone performance where applicable. |
End-of-line test limits, calibrated instrument list, test fixtures, sample measurement reports, and failure-disposition records. |
Objective limits provide more reliable quality control than subjective listening checks alone. |
Must Verify |
| Installation Compatibility |
Confirm compatibility with the target vehicle interfaces, steering-wheel controls, factory amplifiers, cameras, sensors, antennas, and vehicle communication networks. |
Compatibility matrix, wiring diagrams, installation manual, vehicle test list, and documented software version control. |
Reduces installation time, integration errors, customer complaints, and the risk of vehicle-function interference. |
Must Verify |
| Sample Approval |
Use an approved pre-production sample or golden sample before mass production; changes require written approval. |
Signed sample approval, bill of materials, approved drawings, firmware checksum, cosmetic standard, and change-control form. |
Ensures that production units match the version tested and approved by the buyer. |
High Priority |
| Incoming Material Control |
Critical components should have defined inspection criteria, supplier lot control, and verification of electrical and mechanical specifications. |
Approved supplier list, incoming inspection records, component certificates, sampling plan, and nonconforming-material procedure. |
Many audio failures originate from inconsistent connectors, capacitors, displays, wiring, or power components. |
Recommended |
| Packaging and Shipping Protection |
Packaging should protect against vibration, compression, moisture, electrostatic discharge, and connector or display damage during transport. |
Packaging specification, carton dimensions, drop-test record, palletization plan, moisture protection method, and product labeling sample. |
Good packaging reduces transit damage and simplifies warehouse receiving and installation handling. |
Recommended |
| Lead-Time Definition |
Separate sample lead time, tooling lead time, first-production lead time, repeat-order lead time, and documentation approval time. |
Written production schedule with milestone dates, dependencies, buffer assumptions, and escalation contacts. |
A single average lead-time number can hide approval, material, tooling, and production constraints. |
Must Verify |
| Delivery Terms |
Specify the applicable Incoterms® 2020 rule, named place, export responsibility, insurance responsibility, freight method, and transfer of risk. |
Quotation and sales contract showing the exact term, named destination, included charges, exclusions, and shipping documents. |
Clear delivery terms prevent disputes over freight, customs clearance, insurance, unloading, and delivery responsibility. |
Must Verify |
| Shipment Documentation |
Commercial invoice, packing list, transport document, certificate of origin when required, product labels, and conformity documents should match the shipment. |
Redacted document package from a previous shipment and a document checklist agreed before dispatch. |
Accurate documents support customs clearance, receiving inspection, and warranty traceability. |
High Priority |
| Warranty and After-Sales Support |
Define warranty period, defect classification, response time, replacement or repair process, freight responsibility, and technical-support channel. |
Warranty policy, return-material authorization procedure, failure-analysis template, spare-parts plan, and service-level commitments. |
Installation projects require predictable support when compatibility or field failures appear after deployment. |
High Priority |
| Commercial Risk Control |
Payment milestones should connect to measurable deliverables such as sample approval, production completion, inspection, and shipment documentation. |
Draft purchase agreement, inspection clause, acceptable-quality-limit plan, change-control clause, and cancellation terms. |
Milestone-based controls reduce exposure before the supplier has demonstrated production and delivery performance. |
Recommended |
| Supplier Selection Decision |
Use a weighted scorecard; a practical structure is manufacturing capacity 25%, testing and quality 30%, compatibility 20%, delivery 15%, and service/commercial terms 10%. |
Completed audit scorecard, evidence links, open-risk register, corrective-action deadline, and final approval record. |
A documented scoring method makes supplier comparisons more objective and highlights risks that price alone cannot show. |
Best Practice |
