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Black rectangular wiring harness with multiple coloured connectors and a flat ribbon cable

iDatalink

iDatalink HRN-HRR-GM3 Radio Replacement Harness 2014-Up GM

SKU CH-7EM5-RNRZF

Connects an aftermarket radio to select 2014-up GM vehicles while keeping steering-wheel controls, chimes, OnStar, backup camera and vehicle settings

  • TypeRadio Replacement Harness Kits
  • FeaturesSpecifically designed for select GM vehicles
  • Retains steering wheel audio controls for safe, convenient operation
  • Preserves OnStar with Bluetooth for continued hands-free communication
  • Keeps factory backup camera active for reversing assistance
  • Maintains vehicle customisation settings on the new head unit
  • Displays engine performance data on the touchscreen for real-time monitoring

Vehicle Compatibility

The iDatalink HRN-HRR-GM3 radio replacement harness fits select GM vehicles from 2014 onward. It supports both non-amplified and factory-amplified audio systems, though the original amplifier must be bypassed during installation. This harness is intended for owners upgrading to an aftermarket head unit while keeping key factory features active.

Installation Requirements

A Maestro ADS-MRR or ADS-MRR2 module is required for the harness to function correctly. The radio-side universal connector works with Maestro head-unit adapters for a plug-and-play connection or can be wired conventionally. No thermals, noise or power-draw figures apply to this passive wiring harness.

Retained Functions

The harness preserves steering wheel audio controls, warning chimes, OnStar with Bluetooth, the factory backup camera and vehicle customisation menus. It also enables engine performance data to appear on the new touchscreen. It does not retain the factory amplifier, so that component must be bypassed or replaced.

Highlights

  • Retains steering wheel audio controls for safe, convenient operation
  • Preserves OnStar with Bluetooth for continued hands-free communication
  • Keeps factory backup camera active for reversing assistance
  • Maintains vehicle customisation settings on the new head unit
  • Displays engine performance data on the touchscreen for real-time monitoring

Specifications

BrandiDatalink
TypeRadio Replacement Harness Kits
FeaturesSpecifically designed for select GM vehicles

Questions about this item

How do I install the iDatalink HRN-HRR-GM3 harness and what step is often missed?

Connect the harness to the vehicle wiring, then link the Maestro ADS-MRR or ADS-MRR2 module; the step often missed is installing that required module for steering wheel controls, chimes, OnStar and backup camera retention.

What maintenance or replacement will the iDatalink HRN-HRR-GM3 harness need later?

The harness itself is a passive wiring assembly with no serviceable parts; only the connected Maestro module or aftermarket radio may require future firmware updates or replacement.

What limit appears first on the iDatalink HRN-HRR-GM3 harness during sustained use?

The harness does not amplify signals, so the first limit is the factory amplifier — it must be bypassed rather than retained, otherwise audio quality degrades under continuous high-volume playback.

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