1. Disconnect the negative battery cable..
2. Disconnect the connector..
3. Verify the resistance between bass-box terminals.

If not within the specification, replace the bass-box.

0.9—1.1 ohms
Auxiliary Jack/Usb Port Removal/Installation
Bass Box Removal/InstallationFront Seat Cover Removal/Installation [Vehicles Without Power Seat System]
WARNING:
Handling a front seat (with built-in side air bag) improperly can accidentally
operate (deploy) the air bag, which may seriously injure you. Read the service
warnings before handling a front seat (with built-in side air bag)..
CAUTION:
After removing a front seat ...
DSC HU/CM Inspection
1. Disconnect the DSC HU/CM connector..
2. Connect the negative battery cable..
3. Attach the tester lead to the DSC HU/CM wiring harness-side connector and
inspect voltage, continuity, or resistance according to the standard (reference)
on the table.
Standard (Reference)
...
Quarter Window Glass Removal
1. Remove the following parts:
a. Rear seat cushion.
b. Rear scuff plate.
c. Tire house trim.
d. Trunk side upper trim.
e. C-pillar trim.
2. Apply protective tape along the edge of the body and the quarter window glass.
NOTE:
For the areas of the sealant that are difficult ...