1. Inspect for continuity between the audio amplifier connector terminals and woofer connector terminals using an ohmmeter.
2. Verify that there is battery positive voltage at the woofer connector terminal A (4SD) or C (5HB) using a voltmeter.
3. Inspect continuity between the woofer connector terminal B and body ground using an ohmmeter.
Mazda 6 Service Manual: Sas unit configuration
1. Connect the SST (WDS or equivalent) to the DLC-2.
2. Input vehicle information following the directions on the screen.
3. Select Module programming.
4. Select Programmable module installation.
5. Select the following items and perform procedures according to directions
on the screen.
...
Mazda 6 Service Manual: Shroud panel removal/installation
1. Remove the bonnet. (See BONNET REMOVAL/INSTALLATION.)
2. Remove the front bumper. (See FRONT BUMPER REMOVAL/INSTALLATION.)
3. Remove the front combination light. (See FRONT COMBINATION LIGHT
REMOVAL/INSTALLATION.)
4. Remove the front bumper reinforcement. (See BUMPER REINFORCEMENT
REMOVAL/ ...