Subaru Legacy 2004 Service Manual page 4155

13.General Diagnostic Table
A: INSPECTION
Read the DTC or inspect and diagnose the following data in the current data display using Subaru Select
Monitor.
1. LAN SYSTEM
Item
DTC is not displayed when inspect-
Diagnostic code
ing all DTCs.
Check the current data display of
Engine coolant ECM, TCM and body integrated
temperature unit, and make sure all data have
same values.
It turns to ON when pressing
R defogger SW
switch. (Low-speed CAN is OK)
R defogger output When switch input, it is output.
When locked with door lock switch,
Door lock SW
it turns to ON.
When locked with door lock switch,
Door lock actuator
it is output.
2. BODY INTEGRATED UNIT
Item
Operate the illumination volume,
Illumination VR
illumination light is controlled with
power supply
changing of data display voltage.
Check the fuel level resistance and
Fuel level resis-
fuel level resistance 2. Both resis-
tance
tances are same.
When turned rear fog light switch to
R fog light input
ON, data display turns to ON.
When turned rear fog light switch to
R fog light output
ON, output turns to ON.
When rear wiper SW to ON, data
R wiper SW input
display turns to ON.
When rear wiper switch to ON, out-
R wiper output
put signal turns to ON.
Keyless entry LOCK/UNLOCK the
Keyless Entry
doors.
When brake pedal is depressed, it
Brake SW
turns to ON.
The shift lock releases when
Shift lock solenoid
depressing the brake pedal.
General Diagnostic Table
Operation
DTC is not dis-
Operation
Illumination light is
controlled with
changing of data.
LAN(diag)-79
Specifications
YES NO
Perform the diag-
nosis according to
played.
DTC.
Inspect LAN sys-
Same values
tem.
Inspect rear defog-
Turns to ON.
ger switch.
Replace the body
Output
integrated unit.
Inspect door lock
Turns to ON.
switch.
Replace the body
Output
integrated unit.
Specifications
YES NO
Inspect the illumi-
nation volume.
Inspect body inte-
Same values
grated unit.
Inspect rear fog
Turns to ON.
light switch.
Inspect body inte-
Turns to ON.
grated unit.
Inspect rear wiper
Turns to ON.
switch.
Replace the body
Turns to ON.
integrated unit.
Inspect the key-
Operate
less antenna.
Inspect brake
Turns to ON.
switch.
Inspect the shift
Released
lock.
LAN SYSTEM (DIAGNOSTICS)
NOTE
—
If engine coolant tempera-
ture sensor is not OK,
inspect the sensor circuit.
Rear defogger switch is
connected with Low-
speed CAN.
If not operate with output,
check the rear defogger
relay.
Door lock switch is con-
nected with Low-speed
CAN.
—
NOTE
—
Compare the input and
output values of body inte-
grated unit.
—
If not operate with output
turned to ON, check the
rear fog light relay.
—
If not operate with output
turned to ON, check the
rear wiper motor.
If the antenna is OK,
replace the body inte-
grated unit.
—
—