Wire Harness Sample Approval Checklist Before Production Release

A wire harness sample approval checklist should show whether a specific sample matches the controlled design and agreed inspection plan. Before approval, confirm its part number and revision, compare the build with the drawing, BOM and pinout, record the checks performed, and state exactly what the decision releases. A visual review alone does not establish production readiness.

Key checks before approval

• Identify the sample, build stage, drawing revision and BOM revision.
• Verify connector part numbers, keying, orientation, cavity assignments and wire identification.
• Compare branch layout, dimensions, splices, protection, labels and retention features with controlled documents.
• Inspect workmanship against the applicable customer or project criteria.
• Complete only the dimensional, visual, fit and electrical checks agreed for this stage.
• Record findings, deviations, owners and the final disposition.

Confirm the sample configuration

Start with document control. Match the sample to the released drawing, BOM, wire list and connector pinout. Record revisions because a correct-looking build can still reflect outdated information. Identify the sample or lot if assigned, and note whether it is a prototype, validation sample or pre-production build.

Check that the installed connectors and terminals match the specified parts. Confirm cavity locations, keying and orientation against the mating interface. Review wire colors or circuit identifiers, splice locations, branch breakouts, protective coverings, labels and clips against the approved design. If a feature is unclear or differs from the documents, record the question or deviation; do not infer the intended design from appearance alone.

Review fit, dimensions and workmanship

Where practical, inspect the harness in its intended assembly condition. Check branch reach, connector access, retention points and clearance from nearby moving or sharp features. Confirm the reviewed routing and installation orientation, especially when more than one arrangement is possible. A bench layout can help assess construction but may not reveal an installation interference.

Measure dimensions using the datum, endpoints and method stated in the drawing. Record the feature, observed result, measurement method and applicable acceptance range. If the drawing does not define a repeatable measurement or acceptance limit, request clarification rather than creating a supplier-side criterion. The wire harness drawing dimensions guide explains how to document datums and branch measurements.

Inspect workmanship against the project’s approved requirements. Depending on the specification, this may include terminal seating and locks, seals, crimp appearance, splices, sleeves, strain relief and label placement. JinHai’s wiring harness quality overview y production process information provide general context; they do not replace the acceptance criteria for a particular customer program.

Define and document electrical checks

Agree the electrical test scope before the sample arrives. If required by the project plan, checks may cover continuity, incorrect connections, shorts or other specified conditions. Confirm that the test fixture and connection map match the current pinout. Record the sample identifier, fixture or pinout revision, test method, results and exceptions. Use only approved test settings; do not infer voltage, current or pass limits from a generic checklist.

When a check fails, preserve the initial result and record the investigation separately. Identify whether the issue relates to workmanship, a document discrepancy, the fixture or an authorized design change. Link any retest to its corrective action and to the same sample or a clearly identified replacement. A continuity pass by itself may not confirm that every circuit occupies the correct cavity, so define the required checks for the actual connection map.

Record findings and deviations

Use one finding per requirement instead of a general “looks good” comment. Note the requirement or drawing feature, observation or measurement, method, result and disposition. Photographs can support a finding when they are labeled and linked to the relevant item; they do not replace measurements or required tests.

For each deviation, state the affected feature, reason, approval owner, scope and any limit or expiry. Separate correction of a build defect from a design change that needs authorization. If approval is conditional, list the condition and evidence needed to close it. A sample deviation does not automatically change the released design or apply to later production lots.

Make the approval decision specific

Choose and document the disposition under the project process: approved, approved with conditions, or rejected. Identify the part and revisions covered, the sample reviewed, the checks completed, outstanding actions and the next authorized stage. If rejected, state what must change and which revision will govern the next build.

Keep sample acceptance separate from production release. The decision may approve one sample configuration for a named next stage while other customer sign-offs, process documents or validations remain open. The customized process overview describes sample production and validation at a general level; the project record must define the specific release scope.

Keep a retrievable approval record

Store the approval with the reviewed drawing and BOM revisions, sample identification, inspection and test results, photographs of findings, deviation approvals and action dispositions. Make the record searchable by part number and revision. If the physical sample is retained as a reference, label it clearly so it cannot be mistaken for a newer configuration.

Share the controlled decision with the teams that need it, such as engineering, quality, purchasing and manufacturing. State what change would require another review. A concise signed form or approved electronic record is sufficient when it answers four questions: which sample was reviewed, against which revision, what was checked, and what remains open.

Frequently asked questions

Does sample approval automatically release production?

No. Record the specific sample, revision, stage and conditions covered. Production release may require additional approvals or evidence under the customer’s process.

Can photographs replace physical sample checks?

No. Photos can document visible details, but they do not replace required fit, dimensional, mating or electrical checks.

What if the drawing changes after approval?

Review the change’s effect on fit, function, materials and verification. Decide whether a new sample or additional checks are required, then update the controlled record.

For a project-specific sample review, use JinHai’s contact page to share the relevant requirements and documents.