Circuit Continuity Checks

Disconnect the battery cable or connector so there is no voltage between check points.
Contact the two leads of an ohmmeter to each of the check points.

If the circuit has diodes, reverse the two leads and check again.
Use an ohmmeter to check for the diode continuity. When contacting the negative lead to diode positive side and positive lead to negative side, there should be continuity.
When contacting the two leads in reverse, there should be no continuity.

Fig 1: Checking Diode Continuity Using Ohmmeter
Courtesy of SUBARU OF AMERICA, INC.
Symbol " " indicates that continuity exists between two points or terminals. For example, when a switch position is "3", continuity exists among terminals 1, 3 and 6, as shown in table below.

Fig 2: Switch Terminals Continuity Chart

Courtesy of SUBARU OF AMERICA, INC.