Work Instructions for Automotive Tier 2 and Tier 3 Suppliers
Tier 2 and tier 3 automotive suppliers are judged on whether the operator at the station is doing exactly what the control plan says. Work instructions are the link between the PFMEA, the control plan and the shop floor, and IATF 16949 auditors and customer quality engineers check that link at the station, not in the office.
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What IATF 16949 expects at the station
IATF 16949 adds automotive requirements on top of ISO 9001. For operator instructions, it expects documented standardised work that is understandable to the people who use it, kept at the work station, and consistent with the control plan and process FMEA. It also expects job set-ups to be verified, with a documented first-off check after every setup, material change or job change, and records kept of those checks. The ISO 9001 vs IATF 16949 comparison sets out the main additions.
Documented information has its own automotive layer: record retention that satisfies the customer and regulators, and a process to review customer-specific requirements and fold them into your own documents. IATF 16949 clause 7.5 covers what that means in practice.
Customer-specific requirements and the core tools
Every OEM publishes customer-specific requirements (CSRs), and tier-one suppliers often add their own. A tier 2 or tier 3 supplier may have to meet several sets at once: different PPAP submission levels, different rules for labelling, and different notification rules for process changes.
The AIAG core tools tie it together. The PFMEA identifies the failure modes, the control plan lists the controls, and the work instruction tells the operator how to carry them out. If one changes and the others do not, an auditor will find the gap. The quality core tools guide explains how they connect.
Reaction plans in the control plan should appear in the instruction, in the operator’s words.
Temporary alternate process controls need their own approved instruction and a defined end.
Error-proofing devices need a daily verification step, written into the startup instruction.
The templates and tools that matter most
Coplain pages for automotive tier 2/3 suppliers, in priority order
The format most customers expect when a complaint comes in.
Example: Setup verification, progressive die stamping
Example An excerpt from a station instruction at Ridgeway Stampings, a fictional tier 2 supplier. The part, dimensions and checks are example values; use your own control plan and customer requirements.
Confirm the setup sheet. Check the die number, coil material and setup sheet revision against the job order. Key point: The coil tag must match the material on the control plan. Reason: Wrong material is a common source of customer complaints.
Run and quarantine first parts. Run the first strip and place the first-off parts in the red first-off tray. Key point: Do not release the press to production yet. Reason: Parts made before verification are not approved.Safety: Keep hands out of the die area; use the two-hand control.
Check SC1 on the fixture. Load a first-off part on CF-31 and insert each go pin, then each no-go pin. Key point: Every go pin enters and no no-go pin enters. Reason: SC1 affects fit at the customer’s assembly.
Measure SC2. Measure flange height at the two marked points and record both values with the gauge ID. Key point: Both values within the control plan limits. Reason: Records the setup was verified with a calibrated gauge.
Release or react. If all checks pass, sign the first-off record and release the press. If any check fails, follow the reaction plan on the control plan and call the setup lead. Key point: Never adjust and re-check without recording both results. Reason: The record must show what was found and what was done.
Acceptance criteria
All go pins enter and no no-go pins enter on CF-31
SC2 values recorded and within control plan limits
First-off record signed before production parts are packed
Common audit findings
These are the kinds of findings auditors and customers commonly write in this industry, with a way to prevent each one in the instruction itself.
The instruction at the station does not match the current control plan. Change both together through one change request and check them side by side at release.
Setup verification is done but not recorded, or not repeated after a material change. Make the first-off record part of the instruction and list every trigger.
Reaction plans are not known by operators. Write the reaction plan into the step where the check is made, and ask about it in layered process audits.
A customer-specific requirement was not deployed to the shop floor. Keep a CSR matrix that shows where each requirement lives in your documents.
Error-proofing verification is missing or undated. Add a start-of-shift check with a master part and a record field.
Operator training records do not cover the current revision. Link revisions to the training skills matrix and retrain on significant changes.
Frequently asked questions
Do tier 3 suppliers need IATF 16949 certification?
Not always. Many OEMs require it of direct suppliers and ask lower tiers for ISO 9001 plus targeted core-tool requirements. Your customer’s purchase order and CSRs decide; ask them.
What is the difference between a control plan and a work instruction?
The control plan lists what is controlled, how and how often. The work instruction tells the operator how to do the work and the checks. Both must agree on every characteristic.
Should work instructions use photos?
Yes, where it helps. IATF 16949 asks for instructions operators can understand and names visual standards alongside operator instructions. Keep the photos controlled and current.
How do layered process audits relate to work instructions?
An LPA question often reads “Is the operator following the current instruction?” The audit is only as good as the instruction it checks against.
Sources
IATF 16949:2016 Quality management system requirements for automotive production and relevant service parts organizations, International Automotive Task Force
APQP, PPAP, FMEA, SPC and MSA reference manuals, AIAG
Turn your documents into audit-ready work instructions
Upload a control plan, PFMEA or setup sheet and Coplain’s Job Aid Builder drafts station instructions that carry every characteristic, check and reaction plan, ready for the operator and the auditor.