1997 SUBARU LEGACY light

C: DIAGNOSTICS PROCEDURE No. 1
Check that stop lights do not remain on when brake
pedal is released.
OK
Not OK
Check stop light system.
Disconnect connector from shift lock control module.
Check that shift lock does not occur when shift lever
is moved to“P”.
OK
Not OK
Replace shift lock control module.
Disconnect connector from“P”position switch.
Disconnect connector from shift lock solenoid.
Check that shift lock does not occur when shift lever
is moved to“P”.
OK
Not OK
Short in wiring harness of shift lock solenoid.
Check selector lever assembly.






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6-2DIAGNOSTICS
2. AT Shift Lock System

D: DIAGNOSTICS PROCEDURE No. 2 (SHIFT
LOCK DOES NOT RELEASE.)
Check if stop light comes on when brake pedal is
depressed.
OK
Not OK
Check stop light system.
Check if voltage between shift lock control module
terminal No. 4 and body is at least 10 V when brake
pedal is depressed.
OK
Not OK
Repair or replace wiring harness or faulty connector
between stop light switch and shift lock control
module.
Check if voltage between shift lock control module
terminal No. 1 and body is at least 10 V when
ignition switch is turned ON.
OK
Not OK
Check fuse.
Repair or replace wiring harness or faulty connector
between ignition switch and shift lock control
module.
Turn ignition switch OFF.
Disconnect connector from shift lock control module.
Check if continuity exists between terminal No. 2 of
shift lock control module connector and body when
shift lever is set at“P”.
OK
Not OK
Check inhibitor switch or repair wiring harness.
Check if continuity exists between terminal No. 5 of
shift lock control module connector and body when
shift lever is set at“P”.
OK
Not OK
Check“P”position switch or repair wiring harness.
Measure resistance between terminal No. 1 of shift
lock control module connector and body.
Resistance is less than 20Ω.
OK
Not OK
Shift lock solenoid circuit is shorted. Repair or
replace wiring harness or faulty connector between
shift lock solenoid and shift lock control module.
Resistance is at least 10Ω.
OK
Not OK
Shift lock solenoid is shorted or poorly grounded.
* After repairs, recheck solenoid operation.
If still faulty, replace shift lock control module.
Check if resistance between terminal No. 10 of shift
lock control module connector and body is less than
10Ω.
OK
Not OK
Shift lock control module ground circuit open or poor
connector contact.
Replace shift lock control module.










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2. AT Shift Lock System

6. Security System
A: ELECTRICAL COMPONENTS LOCATION
B6M0403A
1Security control module

2Security indicator light

3RH door key cylinder lock/unlock switch (built-in tamper
switch)

4Door switch

5Door lock/unlock switch

6Trunk lid key cylinder unlock switch (SEDAN) (built-in tamper
switch)

7Trunk lid switch (SEDAN)

8Rear gate key cylinder lock/unlock switch (WAGON)
9Rear gate switch (WAGON)

10LH door key cylinder lock/unlock switch (built-in tamper
switch)

11Starter interrupt relay

12Headlight alarm relay

13Ignition switch (ACC position)

14Engine hood switch

15Horn

16Headlight
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6-2DIAGNOSTICS
6. Security System

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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6-2DIAGNOSTICS
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. 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

F: DIAGNOSTICS PROCEDURE FOR
SECURITY INDICATOR LIGHT AND
INDICATOR LIGHT CIRCUIT
1. Check security indicator light.
OK
Not OK
Replace indicator light.
2. Check power supply for indicator light.
OK
Not OK
Repair or replace wiring harness.
3. Check harness connector between security
indicator light and security control module.
OK
Not OK
Repair or replace wiring harness.
Go to next step on basic diagnostics procedure.

B6M0382A
1. CHECK SECURITY INDICATOR LIGHT.
1) Remove security indicator light.
2) Measure resistance between security indicator light
connector terminals.
Terminals / Specified resistance:
No. 2—No. 4 / Approx. 120Ω
B6M0443A
2. CHECK POWER SUPPLY FOR INDICATOR LIGHT.
1) Disconnect connector of security indicator light.
2) Measure voltage between security indicator light con-
nector and body.
Connector & terminal / Specified voltage:
(i8) No. 2—Body / 10 V, or more
B6M0498A
3. CHECK HARNESS CONNECTOR BETWEEN
SECURITY INDICATOR LIGHT AND SECURITY
CONTROL MODULE.
1) Disconnect connectors of security indicator light and
security control module.
2) Measure resistance of harness connector between
security indicator light and security control module.
Connector & terminal / Specified resistance:
(i8) No. 4—(B93) No.7/10Ω, max.



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6. Security System