Subaru Legacy 2002 Service Manual page 3148

2. General Description
A: CAUTION
S001001A03
1) Never connect the battery in reverse polarity.
¼ The Auto A/C control module will be destroyed
instantly.
2) Do not disconnect the battery terminals while
the engine is running.
¼ A large counter electromotive force will be gen-
erated in the alternator, and this voltage may dam-
age electronic parts such as A/C control module.
3) Before disconnecting the connectors of each
sensor and the A/C control module, be sure to turn
off the ignition switch.
¼ Otherwise, the Auto A/C control module may be
damaged.
4) Every Auto A/C-related part is a precision part.
Do not drop them.
5) Airbag system wiring harness is routed near the
A/C control panel (A/C control module) and junc-
tion box.
CAUTION:
¼ All Airbag system wiring harness and con-
nectors are colored yellow. Do not use electri-
cal test equipment on these circuits.
¼ Be careful not to damage Airbag system wir-
ing harness when servicing the A/C control
panel (A/C control module) and junction box.
GENERAL DESCRIPTION
B: INSPECTION
S001001
Before performing diagnosis, check the following
items which might affect engine problems.
1. BATTERY
1) Measure battery voltage and specific gravity of
electrolyte.
Standard voltage: 12 V
Specific gravity: Above 1.260
2) Check the condition of the fuses for A/C, heater
and other fuses.
3) Check the condition of the harnesses and har-
ness connectors connection.
2. ASPIRATOR HOSE
1) Make sure that the aspirator hose is securely
connected to the heater unit by inserting a hand
from the driver's compartment and secure as nec-
essary.
2) Turn ignition switch to ON.
3) Push "DEF" switch and then blower fan switch
to turn the blower fan to maximum speed.
AC-5
HVAC System (Auto A/C) (Diagnostics)
S001001A10
S001001A1001
(a) Main fuse box
B4M1361C
S001001A1002
B4M1561