1995 SUBARU LEGACY relay

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


89
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.





98
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.
99
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





100
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.
101
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





102
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.
103
6-2DIAGNOSTICS
6. Security System

1Engine control module (ECM)

2Ignition coil

3Ignitor

4Crankshaft position sensor

5Camshaft position sensor

6Throttle position sensor

7Fuel injectors

8Pressure regulator

9Engine coolant temperature sensor

10Mass air flow sensor

11Idle air control solenoid valve

12Purge control solenoid valve

13Fuel pump

14PCV valve

15Air cleaner

16Canister

17Main relay

18Fuel pump relay

19Fuel filter

20Front catalytic converter

21Rear catalytic converter

22EGR valve
23EGR control solenoid valve

24Radiator fan

25Radiator fan relay

26Pressure sources switching solenoid valve (AT vehicles only)

27Knock sensor

28Back-pressure transducer (AT vehicles only)

29Front oxygen sensor

30Rear oxygen sensor

31Pressure sensor (AT vehicles only)

32A/C compressor

33Inhibitor switch

34CHECK ENGINE malfunction indicator lamp (MIL)

35Tachometer

36A/C relay

37A/C control module

38Ignition switch

39Transmission control module (TCM) (AT vehicles only)

40ABS/TCS control module (TCS equipped models)

41Vehicle speed sensor

42Data link connector (Subaru select monitor)

43Data link connector (OBD-II general scan tool)

44Two way valve
5
2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General