According to IATF 16949:2016 rules 5; the documents, I mentioned below should be ready for Stage -1 audit. In other words, the quality management system should be established, an internal audit should be done, and a management review should be completed before the stage 1 audit.
Documents and subjects should be ready before Stage 1 audit:
a) Description of the remote location and the support they provide.
b) Description of processes showing the sequence and interactions, including the identification of remote supporting functions and outsourced processes.
c) Key indicators and performance trends for the previous twelve (12) months, minimum.
d) Evidence that all the requirements of IATF 16949 are addressed by the client's processes.
e) Quality manual, including the interactions with support functions on-site or remote.
f) Evidence of one full cycle of internal audits to IATF 16949 followed by a management review.
g) List of qualified internal auditors and the criteria for qualification.
h) List of automotive customers and their customer-specific requirements, if applicable.
i) Customer complaint summary and responses, scorecards, and special status, if applicable.
2. Is it mandatory that MRM & Internal audit is conducted before a stage-1 audit?
As you can see as listed above, the completion of the management review and internal audits are mandatory matters.