Mazda 2007 MX-5 Miata Sport Accessories Manual page 13

1. Remove the speaker with the wiring harness passing through the groove of the front door module.
CAUTION:
Fig. 11: Removing Speaker With Wiring Harness Passing Groove Of Front Door Module
Courtesy of MAZDA MOTORS CORP.
DOOR SPEAKER INSPECTION
1. Verify the resistance between door speaker terminals.
If the resistance is not within the specification, replace the door speaker.

Resistance
Standard: 4 ohms
BOSE: 1 ohm
2. Connect a 1.5 V battery to the door speaker and verify that noise is heard from the door speaker.
If no noise is heard, replace the door speaker.

2007 Mazda MX-5 Miata Sport
2007 ACCESSORIES & BODY, CAB Entertainment - MX-5 Miata
If the speaker is installed with the wiring harness out of the

groove, an open circuit in the wiring harness could occur.