Subaru Impreza 2002 Service Manual page 3743

WIRING SYSTEM
2. CIRCUIT CONTINUITY CHECKS
1) 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.
2) Use an ohmmeter to check for the diode continu-
ity. 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.
3) 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 be-
low.
BASIC DIAGNOSTICS PROCEDURE
G6M0207
B6M0749
WI-4
3. HOW TO DETERMINE AN OPEN CIR-
CUIT
1) Voltmeter Method:
An open circuit is determined by measuring the
voltage between respective connectors and ground
using a voltmeter, starting with the connector clos-
est to power supply. The power supply must be
turned ON so that current flows in the circuit. If volt-
age is not present between a particular connector
and ground, the circuit between that connector and
previous connector is open.
2) Ohmmeter method:
Disconnect all connectors affected, and check the
continuity in wiring between adjacent connectors.
When the ohmmeter indicates "infinite", the wiring
is open.
G6M0208
G6M0209