1996 SUBARU LEGACY trunk

From the previous step
Starter motor runs.
OK
 Not OK
Check starter interrupt relay.
Check wiring harness.
Check security control module.
Check driver’s door unlock switch.
Lock the driver’s door without using a ignition key. (Set the inside
lock knob to LOCK and then close the door while lifting the outer
handle).
Within 30 seconds after the above step, open rear LH door.
Indicator light flashes with short intervals (1 Hz).
OK
 Not OK
Check rear LH door switch.
Check rear LH door switch harness.
Check security control module.
Close and lock door.
Indicator light illuminates continuously.
OK
Perform the above steps also on the rear RH door and front RH
door.
OK
 Not OK
Check rear and front RH door switches.
Check wiring harnesses.
Check security control module.
Pull engine hood opener lever and open engine hood.
Indicator light flashes at short intervals (1 Hz).
OK
 Not OK
Check hood switch.
Check hood switch harness.
Check security control module.
Close engine hood.
Indicator light illuminates continuously.
SEDAN
 WAGON
Unlock rear gate by operating driver’s door inside lock knob and
open rear gate.
Pull trunk opener lever and open trunk lid.Indicator light flashes at short intervals (1 Hz).
OK Not OK
Indicator light flashes at short intervals (1 Hz).
OK Not OKCheck rear gate switch.
Check rear gate switch harness.
Check security control module.
Check trunk switch.
Check trunk switch harness.
Check security control module.Close rear gate and lock by locking driver’s door using a
ignition key.
Close trunk lid.Indicator light illuminates continuously.
Indicator light illuminates continuously.Wait for 30 seconds.
Wait for 30 seconds.Indicator light flashes at long intervals (0.2 sec. ON and 2.4
sec. OFF).
Continues to next step. Continues to next step.


















89
6-2DIAGNOSTICS
6. Security System

From the previous step. From the previous step.
Indicator light flashes at long intervals (0.2 sec. ON and 2.4 sec.
OFF).
Unlock rear gate using a ignition key and open.
Unlock trunk lid using a ignition key and open.
The alarm system does not operate.
OK Not OKThe alarm system does not operate.OK Not OK
Check trunk unlock switch.
Check trunk unlock switch harness.
Check security control module.
Check rear gate unlock switch.
Check rear gate unlock switch harness.
Check security control module.
Close trunk lid.Close rear gate.
Lock rear gate using a ignition key.
Indicator light illuminates continuously.Indicator light illuminates continuously.
OK Not OK
Check rear gate lock switch.
Check rear gate lock switch harness.
Check security control module.
Wait for 30 seconds.
Indicator light flashes at long intervals (0.2 sec. ON and 2.4 sec.
OFF).
Unlock front RH door using a ignition key and open.
The alarm system does not operate.
OK
 Not OK
Check front RH door key cylinder unlock switch.
Check front RH door key cylinder unlock switch harness.
Check security control module.
Close front RH door and lock using a ignition key.
Indicator light illuminates continuously.
OK
 Not OK
Check front RH door key cylinder lock switch.
Check front RH door key cylinder lock switch harness.
Check security control module.
Finish checking security system.
















90
6-2DIAGNOSTICS
6. Security System

I: DIAGNOSTICS PROCEDURE FOR TRUNK
LID SWITCH (SEDAN) OR REAR GATE
SWITCH (WAGON) SIGNAL
1. Check trunk lid switch (SEDAN) or rear gate
switch (WAGON) input signal for security
control module.
Not OK
OK
Go to next step on basic diagnostics procedure.

2. Check trunk lid switch (SEDAN) or rear gate
switch (WAGON).
OK
Not OK
Replace trunk lid switch (or rear gate switch).
Repair or replace wiring harness between trunk lid
switch (or rear gate switch) and security control
module.
B6M0450A
1. CHECK TRUNK LID SWITCH (SEDAN) OR REAR
GATE SWITCH (WAGON) INPUT SIGNAL FOR
SECURITY CONTROL MODULE.
1) Remove security control module without disconnecting
connector.
2) Turn trunk lid switch (or rear gate switch) ON/OFF and
measure voltage between security control module connec-
tor and body.
Connector & terminal / Specified voltage:
(B93) No. 11—Body / 10 V, or more
(Lid or gate closed)
/ 1 V, max.
(Lid or gate opened)
2. CHECK TRUNK LID SWITCH (SEDAN) OR REAR
GATE SWITCH (WAGON).
Refer to 6-2 [W8B2], [W8B3] for inspection of trunk lid
switch/rear gate switch.
NOTE:
The trunk lid switch/rear gate switch is used for both trunk
room light/luggage room light.


96
6-2DIAGNOSTICS
6. Security System

B6M0446A
Trunk lid (SEDAN)
Connector & terminal / Specified voltage:
(B93) No. 15—Body/1V,max.
(UNLOCK position)
/ 10 V, or more (other than
UNLOCK position)
B6M0409A
3) Measure voltage between security control module con-
nector and body while removing/installing key cylinder
switch from/to door outer handle.
Connector & terminal / Specified voltage:
(B93) No. 3—Body / 10 V, or more
(Switch is installed.)
/ 1 V, max.
(Switch is removed.)
NOTE:
For SEDAN vehicles, remove key cylinder switch from
trunk lid key cylinder to perform the above inspection.
2. CHECK KEY CYLINDER SWITCH.
Refer to 6-2 [W22B4] for inspection of key cylinder lock/
unlock switch and tamper switch.
99
6-2DIAGNOSTICS
6. Security System

10P1
CHECK EXHAUST SYSTEM.
: Are there holes or loose bolts on exhaust
system?
: Repair exhaust system.
: Go to step10P2.
10P2
CHECK AIR INTAKE SYSTEM.
: Are there holes, loose bolts or disconnec-
tion of hose on air intake system?
: Repair air intake system.
: Go to step10P3.
G2M0340
10P3
CHECK FUEL PRESSURE.
1) Release fuel pressure.
(1) Remove fuel pump access hole lid located on the
right rear of trunk compartment floor (Sedan) or lug-
gage compartment floor (Wagon).
B2M0047
(2) Disconnect connector from fuel tank.
(3) Start the engine, and run it until it stalls.
(4) After stopping the engine, crank the engine for 5 to
7 seconds to reduce fuel pressure.
(5) Turn ignition switch to OFF.
B2M0047
2) Connect connector to fuel tank.
186
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

: Does the value change more than2.8 kPa
by shaking harness and connector of ECM
while monitoring the value with Subaru
select monitor?
: Repair poor contact in ECM connector.
: Go to step10AK3.
B2M0927
10AK3CHECK HARNESS BETWEEN ECM AND
FUEL TANK PRESSURE SENSOR CON-
NECTOR.
1) Turn ignition switch to OFF.
2) Detach right side trunk side trim panel (Sedan) or right
side rear quarter trim panel (Wagon).
3) Remove right side rear quarter trim pocket (Wagon
model only).
4) Detach right side rear quarter insulator (Wagon model
only).
H2M1255B
5) Disconnect connector from fuel tank pressure sensor.
6) Turn ignition switch to ON.
7) Measure voltage between fuel tank pressure sensor
connector and chassis ground.
: Connector & terminal
(R47) No. 3 (+)—Chassis ground ():
Is the voltage more than 4.5 V?
: Go to next step 8).
: Repair harness and connector.
NOTE:
In this case, repair the following:

Open circuit in harness between ECM and fuel tank
pressure sensor connector

Poor contact in coupling connector (B97)
260
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

H2M1257B
11) Measure resistance of harness between fuel tank
pressure sensor connector and chassis ground.
: Connector & terminal
(R47) No. 1—Chassis ground:
Is the resistance more than 500 kΩ?
: Go to next.
: Repair short circuit in harness between ECM and
fuel tank pressure sensor connector.
: Is there poor contact in fuel tank pressure
sensor connector?
: Repair poor contact in fuel tank pressure sensor
connector.
: Replace fuel tank pressure sensor.
B2M0927
10AK4CHECK HARNESS BETWEEN ECM AND
FUEL TANK PRESSURE SENSOR CON-
NECTOR.
1) Turn ignition switch to OFF and Subaru Select Monitor
or the OBD-II general scan tool switch to OFF.
2) Detach right side trunk side trim panel (Sedan) or right
side rear quarter trim panel (Wagon).
3) Remove right side rear quarter trim pocket (Wagon
model only).
4) Detach right side rear quarter insulator (Wagon model
only).
262
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code

H2M1327
: Does the value change less than 0.12 V by
shaking harness and connector of ECM
while monitoring the value with Subaru
Select Monitor?

Subaru Select Monitor
Designate mode using function key.
Function mode: F45

F45: Fuel level sensor output signal is indicated.
: Repair poor contact in ECM connector.
: Even if MIL lights up, the circuit has returned to a
normal condition at this time. A temporary poor
contact of the connector may be the cause.
NOTE:
In this case, repair the following:

Poor contact in fuel pump connector

Poor contact in combination meter connector

Poor contact in ECM connector

Poor contact in coupling connectors (i3, B99 (LHD only),
B22, B98 (LHD)/B97 (RHD), and R57)
G2M0340
10BP4
CHECK FUEL LEVEL SENSOR.
1) Turn ignition switch to OFF.
2) Remove fuel pump access hole lid located on the right
rear of trunk compartment floor (Sedan) or luggage com-
partment floor (Wagon).
B2M0935
3) Disconnect connector from fuel pump.
4) Measure resistance between connector terminals of
fuel pump.
: Terminals
No. 3—No. 5:
Is the resistance less than 100Ω?
: Go to step10BP5.
: Replace fuel sending unit.
343
2-7ON-BOARD DIAGNOSTICS II SYSTEM
10. Diagnostics Chart with Trouble Code