iDatalink Maestro HRN-RR-CHK MThe HRN-CHK harness Kit Pack is a direct replacement for the harnesses and cables included with the iDatalink Maestro ADS-MRR module. This harness Kit pack gives you all the parts youll need to connect the ADS-MRR module to an iDatalink-ready car stereo.aestro RR Harness Kit Replacement (Wires Only)