1997 SUBARU LEGACY key

C: CONTROL MODULE I/O SIGNAL
B6M0405
Content Terminal No.Measuring conditions and I/O signals
(Ignition switch ACC position)
Door lock/unlock switch1
(INPUT)
Battery voltage is present when all doors and rear gate (WAGON) are locked.

“0”volt is present when one of the doors or rear gate (WAGON) is unlocked.
Key cylinder lock switch2
(INPUT)
“0”volt is present when key cylinder is turned to LOCK position.

Battery voltage is present when key cylinder is in positions other than LOCK.
Tamper switch3
(INPUT)
Battery voltage is present when key cylinder switch is installed to key cylinder.

“0”volt is present when key cylinder switch is removed from key cylinder.
Door switch4
(INPUT)
Battery voltage is present when all doors are closed.

“0”volt is present when one of the doors is open.
Starter interrupt relay5
(OUTPUT)
Battery voltage is present when ignition switch is turned ACC or ON.

“0”volt is present when security system is in alarm state.
Ignition switch (ACC)6
(INPUT)
Battery voltage is present when ignition switch is turned ACC or ON.

“0”volt is present when ignition switch is turned OFF.
Security indicator light7
(OUTPUT)
Battery voltage is present when indicator light goes off.

“0”volt is present when indicator light illuminates.
Power supply (back-up) 8 Battery voltage is constantly present.
Ground 9—
Engine hood switch10
(INPUT)
Battery voltage is present when engine hood is closed.

“0”volt is present when engine hood is open.
Trunk lid switch (SEDAN)
Rear gate switch (WAGON)11
(INPUT)
Battery voltage is present when trunk lid or rear gate is closed.

“0”volt is present when trunk lid or rear gate is open.
Headlight alarm relay12
(OUTPUT)
Battery voltage is present when ignition switch is turned ACC or ON.

“0”volt and battery voltage repeats in alarm state. (Headlights flash intermittently
at 0.2 sec. ON and 0.6 sec. OFF intervals).
Horn relay13
(OUTPUT)
Battery voltage is present when ignition switch is turned ACC or ON.

“0”volt and battery voltage repeats in alarm state. (Horn sounds intermittently at
0.2 sec. ON and 0.6 sec. OFF intervals.)
Key cylinder unlock switch14
(INPUT)
“0”volt is present when key cylinder is turned to UNLOCK position.

Battery voltage is present when key cylinder is in positions other than UNLOCK.
Trunk lid key cylinder unlock
switch (SEDAN)15
(INPUT)
“0”volt is present when trunk lid key cylinder is turned to UNLOCK position.

Battery voltage is present when trunk lid key cylinder is in positions other than
UNLOCK.
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6. Security System

D: BASIC DIAGNOSTICS PROCEDURE
Start security system check.
Fully open all door windows and turn ignition switch OFF.
Take key out of ignition, exit vehicle and lock driver’s door.
Indicator light illuminates.
OK The light flashes.
 The light does not
illuminate.
Check indicator harness.
Check security indicator light.
Check driver’s door key cylinder lock/unlock switch.
Check security control module.
Check whether switch input signal remains UNLOCK.
Check wiring harness.
Check switch input signals.
(Harnesses and switches separately)
(Tamper, door, hood, trunk and rear gate
switch)Check security control module.
Wait for 30 seconds.
Indicator light flashes at long intervals (0.2 sec. ON and 2.4 sec.
OFF).
OK
 Not OK
Check security control module.
Unlock driver’s door using the inside lock knob and open door.
The horn sounds and headlights flash intermittently at 0.2 sec. ON
and 0.6 sec. OFF intervals.
The engine will not start even if the ignition switch is turned to
START. Indicator lamp goes out.
OK Starter motor runs.
 All are not OK.
Check driver’s door switch.
Check wiring harness.
Check security control module.
 Horn is not OK.
Check horn
operation by
pushing horn pad
on steering wheel.
OK
 Not OK
Check horn.
Check horn relay.
Check security control module.
Check harness between horn relay and security control module.
 Headlights are not
OK.
Check headlights
operation by
turning light switch
ON/OFF.
OK
 Not OK
Check headlight
bulbs.
Check combination
switch.
Check headlight
relay.
Check starter interrupt relay.
Check wiring harness.
Check security control module.Check headlight alarm relay.
Check security control module.
Check wiring harness.
The alarm system continues to operate for 150 seconds.
OK Not OK
The horn and
headlights turn off.
The starter motor
does not run.
OK
 Not OK
Check security
control module.
Unlock the driver’s door using ignition key.
Continues to next step.














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6. Security System

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.


















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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.
















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6. Security System

J: DIAGNOSTICS PROCEDURE FOR DOOR
LOCK/UNLOCK SWITCH SIGNAL
1. Check door lock/unlock switch input signal
for security control module.
Not OK
OK
Go to next step on basic diagnostics procedure.

2. Check door lock/unlock switch.
OK
Not OK
Replace door lock/unlock switch.
Repair or replace wiring harness between door lock/
unlock switch and security control module.
B6M0407A
1. CHECK DOOR LOCK/UNLOCK SWITCH INPUT
SIGNAL FOR SECURITY CONTROL MODULE.
1) Remove security control module without disconnecting
connector.
2) Close all the doors and rear gate (WAGON), and lock
with ignition key.
3) Measure voltage between security control module con-
nector and body.
Connector & terminal / Specified voltage:
(B93) No. 1—Body / 10 V, or more
NOTE:
When one of the door (driver, passenger or rear gate) lock
knobs is in unlocked position, the voltage may be 1 V, max.
4) Unlock the door with ignition key.
5) Measure voltage between security control module con-
nector and body.
Connector & terminal / Specified voltage:
(B93) No. 1—Body/1V,max.
2. CHECK DOOR LOCK/UNLOCK SWITCH.
Refer to 6-2 [W22B5] for inspection of door lock/unlock
switch.


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6. Security System

K: DIAGNOSTICS PROCEDURE FOR KEY
CYLINDER LOCK/UNLOCK SWITCH AND
TAMPER SWITCH SIGNAL
NOTE:
Key cylinder lock switch, key cylinder unlock switch and
tamper switch are combined as a unit.
1. Check key cylinder switch input signal for
security control module.
Not OK
OK
Go to next step on basic diagnostics procedure.

2. Check key cylinder switch.
OK
Not OK
Replace key cylinder switch.
Repair or replace wiring harness between key
cylinder switch and security control module.
B6M0499A
1. CHECK KEY CYLINDER SWITCH INPUT SIGNAL
FOR SECURITY CONTROL MODULE.
1) Remove security control module without disconnecting
connector.
2) Measure voltage between security control module con-
nector and body while turning each key cylinder with igni-
tion key.
Doors (RH and LH), and rear gate (WAGON)
Connector & terminal / Specified voltage:
(B93) No. 2—Body/1V,max. (LOCK position)
/ 10 V, or more (other than
LOCK position)
B6M0447A
(B93) No. 14—Body/1V,max. (UNLOCK position)
/ 10 V, or more (other than
UNLOCK position)


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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.
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6. Security System

L: DIAGNOSTICS PROCEDURE FOR
STARTER INTERRUPT SIGNAL
1. Check starter interrupt output signal for security
control module.
Not OK
OK
5. Check starter interrupt relay.
OK Not OK
Repair or replace
wiring harness of
starter motor circuit.
Replace starter
interrupt relay.
2. Check power supply for starter interrupt relay.
OK
Not OK
Repair or replace wiring harness between starter
interrupt relay and battery.
3. Check continuity of starter interrupt relay.
OK
Not OK
Replace starter interrupt relay.
4. Check harness connector between starter
interrupt relay and security control module.
OK
Not OK
Repair or replace wiring harness between starter
interrupt relay and security control module.
Replace security control module.
B6M0445A
1. CHECK STARTER INTERRUPT OUTPUT SIGNAL
FOR SECURITY CONTROL MODULE.
1) Remove security control module without disconnecting
connector.
2) Measure voltage between security control module con-
nector and body.
Connector & terminal / Specified voltage:
(B93) No. 5—Body / 10 V, or more
3) Set security system in armed state.
4) Open the door without ignition key to operate the secu-
rity system (alarm state).
5) Measure voltage between security control module and
body during alarm state.
Connector & terminal / Specified voltage:
(B93) No. 5—Body/1V,max.





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