The 6 speakers highlighted in blue will be activated.
- 2 * A-pillar
- 2 * Side Mirror
- 2 * Rear Shelf
With this wire harness, you can activate the 6 inactive speakers on SR+ (only 4 in post March 2020 build) cars.
The work is done by connecting the front dash speakers parallel with the tweeter and A-pillar speakers to feed the signal for the speakers, and connecting the rear door speakers in parallel with the rear shelf speakers.
Note: this would lower the impedance of the load and might put more stress on the OEM amplifier.