Control Unit: Testing and Inspection

Initialization of the VTM-4 Control Unit
Whenever the VTM-4 control unit is replaced, it must be initialized to make the 4WD system function.

There are two methods used to initialize the VTM-4 control unit.

The recommended method is to use the Honda Diagnostic System (HDS) with the appropriate software plugged into the data link connector (DLC).

The other method is to initialize the VTM-4 control unit manually.

Initialization with the HDS
1. With the ignition switch OFF, connect the HDS to the DLC (A).





2. Make sure the HDS communicates with the VTM-4 control unit. If it doesn't go to the DLC circuit troubleshooting.
3. Turn the ignition switch ON (II), and follow the prompts on the HDS screen.

NOTE: See the HDS user's manual for specific instruction.

Manual Initialization
1. Start the engine (the VTM-4 indicator comes on, and the VTM-4 LOCK switch indicator is off).
2. Apply the brakes, and shift to either the R, 1, or 2 position, then push the VTM-4 LOCK switch (the VTM-4 indicator stays on; and the VTM-4 LOCK switch indicator is on). The 4WD system is now in lock mode.
3. Turn the ignition switch OFF.
4. Turn the ignition switch ON (II) (the VTM-4 indicator and the VTM-4 LOCK indicator both come on for 4 seconds, then go off). The VTM-4 control unit is initialized.