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/InstallationStarter Inspection [Mzr 2.0, Mzr 2.5]
On-vehicle Inspection
1. Verify that the battery is fully charged.
2. The starter is normal if it rotates smoothly and without any noise when the
engine is cranked.
If the starter does not operate, inspect the following:
Remove the starter, and inspect the starter unit.
...
Engine Tune Up [Mzr 2.3 Disi Turbo]
NOTE:
If the accelerator pedal is depressed continuously for a specified time,
the engine speed may decrease to the idle speed. This is due to the fuel cut
control operation, which prevents overheating, and it does not indicate a malfunction.
Engine Tune-up Preparation
1. Verify ...
Overloading
WARNING
Be careful not to overload your vehicle:
The gross axle weight rating (GAWR)
and the gross vehicle weight rating
(GVWR) of the vehicle are on the
Motor Vehicle Safety Standard Label
on the driver's door frame. Exceeding
these ratings can cause an accident
or ve ...