1996 SUBARU LEGACY relay

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

E: DIAGNOSTICS PROCEDURE FOR
SECURITY CONTROL MODULE POWER
SUPPLY/GROUND CIRCUIT
1. Check fuse and power supply circuit.
OK
Not OK

Replace fuse.

Repair or replace wiring harness.
2. Check ground circuit between security control
module and body.
OK
Not OK
Repair or replace wiring harness.
Go to next step on basic diagnostics procedure.

B6M0504A
1. CHECK FUSE AND POWER SUPPLY CIRCUIT.
1) Check fuse No. 25.
2) Measure voltage between main fuse box connector and
body.
Connector & terminal / Specified voltage:
(F35) No. 2—Body / 10 V, or more
B6M0448A
3) Disconnect connector from security control module.
4) Measure voltage between security control module con-
nector and body.
Connector & terminal / Specified voltage:
(B93) No. 8—Body / 10 V, or more
B6M0505A
5) Check fuse No. 3.
6) Turn ignition switch to ACC.
7) Measure voltage between fuse and relay box connec-
tor and body.
Connector & terminal / Specified voltage:
(i5) No. 13—Body / 10 V, or more


91
6-2DIAGNOSTICS
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.





100
6-2DIAGNOSTICS
6. Security System

B6M0506A
2. CHECK POWER SUPPLY FOR STARTER
INTERRUPT RELAY.
1) Remove starter interrupt relay without disconnecting
connector.
2) Measure voltage between starter interrupt relay con-
nector and body.
Connector & terminal / Specified voltage:
(B59) No. 1—Body / 10 V, or more
B6M0455
3. CHECK CONTINUITY OF STARTER INTERRUPT
RELAY.
1) Remove starter interrupt relay.
2) Check continuity between terminals No. 1 and No. 2 of
starter interrupt relay.
B6M0500A
4. CHECK HARNESS CONNECTOR BETWEEN
STARTER INTERRUPT RELAY AND SECURITY
CONTROL MODULE.
1) Disconnect connectors of starter interrupt relay and
security control module.
2) Measure resistance of harness connector between
starter interrupt relay and security control module.
Connector & terminal / Specified resistance:
(B59) No. 2—(B93) No.5/10Ω, max.
5. CHECK STARTER INTERRUPT RELAY.
Refer to 6-2 [W22B1] for inspection of starter interrupt
relay.
101
6-2DIAGNOSTICS
6. Security System

M: DIAGNOSTICS PROCEDURE FOR HORN
ALARM SIGNAL
1. Check horn alarm output signal for security
control module.
Not OK
OK
5. Check horn relay.
OK Not OK
Repair or replace
wiring harness of horn
circuit.
Replace horn relay.
2. Check power supply for horn relay.
OK
Not OK
Repair or replace wiring harness between horn
relay and battery.
3. Check continuity of horn relay.
OK
Not OK
Replace horn relay.
4. Check harness connector between horn relay
and security control module.
OK
Not OK
Repair or replace wiring harness between horn
relay and security control module.
Replace security control module.
B6M0461A
1. CHECK HORN ALARM 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. 13—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. 13—Body / repeats 1 V, max. (0.2 sec.)
and 10 V, or more (0.6 sec.)
intervals





102
6-2DIAGNOSTICS
6. Security System

B6M0507A
2. CHECK POWER SUPPLY FOR HORN RELAY.
1) Check fuse No. 12.
2) Remove horn relay without disconnecting connector.
3) Measure voltage between horn relay connector and
body.
Connector & terminal / Specified voltage:
(B49) No. 2—Body / 10 V, or more
B6M0459
3. CHECK CONTINUITY OF HORN RELAY.
1) Remove horn relay.
2) Check continuity between terminals No. 1 and No. 2 of
horn relay.
B6M0501A
4. CHECK HARNESS CONNECTOR BETWEEN HORN
RELAY AND SECURITY CONTROL MODULE.
1) Disconnect connectors of horn relay and security con-
trol module.
2) Measure resistance of harness connector between horn
relay and security control module.
Connector & terminal / Specified resistance:
(B49) No. 1—(B93) No. 13 / 10Ω, max.
5. CHECK HORN RELAY.
Refer to 6-2 [W15B2] for inspection of horn relay.
103
6-2DIAGNOSTICS
6. Security System

N: DIAGNOSTICS PROCEDURE FOR
HEADLIGHT ALARM SIGNAL
1. Check headlight alarm output signal for security
control module.
Not OK
OK
5. Check headlight alarm relay.
OK Not OK
Repair or replace
wiring harness of
headlight circuit.
Replace headlight
alarm relay.
2. Check power supply for headlight alarm relay.
OK
Not OK
Repair or replace wiring harness between
headlight alarm relay and battery.
3. Check continuity of headlight alarm relay.
OK
Not OK
Replace headlight alarm relay.
4. Check harness connector between headlight
alarm relay and security control module.
OK
Not OK
Repair or replace wiring harness between
headlight alarm relay and security control
module.
Replace security control module.
B6M0457A
1. CHECK HEADLIGHT ALARM 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. 12—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. 12—Body / repeats 1 V, max. (0.2 sec.)
and 10 V, or more (0.6 sec.)
intervals





104
6-2DIAGNOSTICS
6. Security System

B6M0508A
2. CHECK POWER SUPPLY FOR HEADLIGHT ALARM
RELAY.
1) Remove headlight alarm relay without disconnecting
connector.
2) Measure voltage between headlight alarm relay con-
nector and body.
Connector & terminal / Specified voltage:
(B58) No. 1—Body / 10 V, or more
B6M0455A
3. CHECK CONTINUITY OF HEADLIGHT ALARM
RELAY.
1) Remove headlight alarm relay.
2) Check continuity between terminals No. 1 and No. 2 of
headlight alarm relay.
B6M0502A
4. CHECK HARNESS CONNECTOR BETWEEN
HEADLIGHT ALARM RELAY AND SECURITY
CONTROL MODULE.
1) Disconnect connectors of headlight alarm relay and
security control module.
2) Measure resistance of harness connector between
headlight alarm relay and security control module.
Connector & terminal / Specified resistance:
(B58) No. 2—(B93) No. 12 / 10Ω, max.
5. CHECK HEADLIGHT ALARM RELAY.
Refer to 6-2 [W22B2] for inspection of headlight alarm
relay.
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6-2DIAGNOSTICS
6. Security System