Subaru Impreza 2003, Service Manual

Page: 3319 / 3610

WI-15
WIRING SYSTEM
WORKING PRECAUTIONS
2. Working Precautions
A: PRECAUTIONS WHEN WORKING
WITH THE PARTS MOUNTED ON
THE VEHICLE
1) When working under a vehicle which is jacked-
up, always be sure to use safety stands.
2) The parking brake must always be applied dur-
ing working. Also, in automatic transmission mod-
els, keep the select lever set to P (Parking) range.
3) Be sure the workshop is properly ventilated
when running the engine. Further, be careful not to
touch the belt or fan while the engine is operating.
4) Be careful not to touch hot metal parts, especial-
ly the radiator and exhaust system immediately af-
ter the engine has been shut off.
B: PRECAUTIONS IN TROUBLE DI-
AGNOSIS AND REPAIR OF ELEC-
TRIC PARTS
1) The battery cable must be disconnected from
battery's (
−
) terminal, and the ignition switch must
be set to OFF position, unless otherwise required
by the diagnostics.
2) Securely fasten the wiring harness with clamps
and slips so that the harness does not interfere with
body end parts or edges and bolts or screws.
3) When installing the parts, be careful not to catch
them on the wiring harness.
4) When disconnecting a connector, do not pull the
wires, but pull while holding the connector body.
5) Some connectors are provided with a lock. One
type of such a connector is disconnected by push-
ing the lock, and the other, by moving the lock up.
In either type the lock shape must be identified be-
fore attempting to disconnect the connector.
To connect, insert the connector until it snaps and
confirm that it is tightly connected.
6) When checking continuity between connector
terminals, or measuring the voltage across the ter-
minal and ground, always contact tester probe(s)
on terminals from the wiring connection side. If the
probe is too thick to gain access to the terminal, use
“mini” test leads.
To check water-proof connectors (which are not ac-
cessible from the wiring side), contact test probes
on the terminal side being careful not to bend or
damage terminals.
7) Sensors, relays, electrical unit, etc., are sensi-
tive to strong impacts.
Handle them with care so that they are not dropped
or mishandled.
WI-00118
Correct
Wrong
WI-00119
Example
LIFT
LIFT
PUSH
PUSH
PUSH
WI-00120
Tester probes "Mini" test leads