Use the correct trailer ball for your application.

1. Trailer ball load rating Matches or exceeds the gross trailer weight rating of the trailer.
2. Ball diameter
Matches the size of the trailer coupler. Most couplers are stamped with the required
trailer ball size.

3. Shank length
Protrudes beyond the bottom of the lock washer and nut at least 2 threads.
4. Shank diameter
Matches the ball mount hole diameter size.
Hitch
Positions for towing hitch receiver and hitch ballTerminals Of Ecu
TERMINALS OF ECU
1. CHECK MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY)
(a) Disconnect the main body ECU (driver side junction block assembly) connectors.
(b) Measure the resistance and voltage according to the value(s) in the table
below.
...
Brake Switch "A" / "B" Correlation (P0504)
DESCRIPTION
The stop light switch is a duplex system that transmits 2 signals: STP and ST1-.
These 2 signals are used by the ECM to monitor whether or not the brake system is
working properly. If signals which indicate the brake pedal is being depressed a ...
Customize Parameters
CUSTOMIZE PARAMETERS
1. CUSTOMIZING FUNCTION WITH TECHSTREAM (REFERENCE)
HINT:
When the customer requests a change in a function, first make sure that
the function can be customized.
Be sure to make a note of the current settings before cust ...