1999 SUBARU FORESTER Service Repair Manual

4. DIAGNOSTICS ITEM 3
4F41 : CHECK DOOR SWITCH.
1) Remove door switch.
B6M0070A
2) Move switch and check continuity between ter-
minals of door switch.
Terminals
No. 1 Ð Chassis ground
S6M0453A
:Does any fault exist in the door
switch?
: Replace door switch.
: Replace keyless entry control module.

5. DIAGNOSTICS ITEM 4
4F51 : CHECK IGNITION SWITCH.
1) Remove ignition switch.
2) Turn ignition key to each position and check
continuity between terminals of ignition switch con-
nector.
B6M1356A
:Is the ignition switch faulty?
: Replace ignition switch. [W3A1].>
: Replace keyless entry control module.

67
[T4F5]6-2DIAGNOSTICS
4. Keyless Entry System

6. DIAGNOSTICS ITEM 5
4F61 : CHECK FUSE.
Remove and visually check the fuse No. 6 (in main
fuse box).
:Is fuse No. 6 blown?
: Replace fuse (15 A).
: Go to step4F62.
4F62 : CHECK KEYLESS ENTRY CONTROL
MODULE.
1) Disconnect connector from keyless entry con-
trol module.
2) Insert the key to ignition switch (LOCK posi-
tion).
3) Measure voltage between keyless entry control
module connector (B176) and chassis ground.
Connector & terminal
(B176) No. 16 (+) Ð Chassis ground (þ):
B6M0963A
:Is the voltage more than 10 V?
: Replace keyless entry control module.

: Go to step4F63.4F63 : CHECK HARNESS CONNECTOR
BETWEEN BATTERY AND KEY
WARNING SWITCH.
1) Disconnect connector from key warning switch.
2) Measure voltage between key warning switch
connector (B74) and chassis ground.
Connector & terminal
(B74) No. 2 (+) Ð Chassis ground (þ):
B6M0964A
:Is the voltage more than 10 V?
: Go to step4F64.
: Repair wiring harness between battery
and key warning switch.
4F64 : CHECK HARNESS CONNECTOR
BETWEEN KEY WARNING SWITCH
AND KEYLESS ENTRY CONTROL
MODULE.
Measure resistance between key warning switch
connector (B74) and keyless entry control module
connector (B176).
Connector & terminal
(B74) No. 1 Ð (B176) No. 16:
B6M0965A
:Is the resistance less than 10W?
: Replace key warning switch.
: Repair wiring harness between key
warning switch and keyless entry control
module.
68
6-2[T4F6]DIAGNOSTICS
4. Keyless Entry System

5. Security System
A: PRECAUTION
1. SUPPLEMENTAL RESTRAINT SYSTEM
ªAIRBAGº
Airbag system wiring harness is routed near the
security control module.
CAUTION:
IAll airbag system wiring harness and con-
nectors are yellow. Do not use electrical test
equipment on these circuits.
IBe careful not to damage airbag system wir-
ing harness when servicing the security con-
trol module.
B: PRE-INSPECTION
1. FUSE
5B11 : CHECK FUSE.
Remove and visually check the fuse No. 7 (in main
fuse box).
:Is fuse No. 7 blown?
: Replace fuse (20 A).
: Go to step5B12.
5B12 : CHECK FUSE.
Remove and visually check the fuse No. 2 (in main
fuse box).
:Is fuse No. 2 blown?
: Replace fuse (15 A).
: Go to step5B21.
2. POWER SUPPLY CIRCUIT
5B21 : CHECK POWER SUPPLY CIRCUIT.
Measure voltage between main fuse box connec-
tor (F68) and chassis ground.
Connector & terminal
(F68) No. 4 (+) Ð Chassis ground (þ):
B6M1357A
:Is the voltage more than 10 V?
: Go to step5B22.
: Repair wiring harness between main
fuse box and battery.
5B22 : CHECK POWER SUPPLY CIRCUIT.
1) Disconnect connector from security control
module.
2) Measure voltage between security control mod-
ule connector (B93) and chassis ground.
Connector & terminal
(B93) No. 11 (+) Ð Chassis ground (þ):
B6M0967A
:Is the voltage more than 10 V?
: Go to step5B23.
: Repair wiring harness between security
control module and main fuse box.
69
[T5B2]6-2DIAGNOSTICS
5. Security System

5B23 : CHECK POWER SUPPLY CIRCUIT.
Measure voltage between main fuse box connec-
tor (F68) and chassis ground.
Connector & terminal
(F68) No. 2 (+) Ð Chassis ground (þ):
B6M1358A
:Is the voltage more than 10 V?
: Go to step5B24.
: Repair wiring harness between main
fuse box and battery.
5B24 : CHECK POWER SUPPLY CIRCUIT.
Measure voltage between security control module
connector (B93) and chassis ground.
Connector & terminal
(B93) No. 13 (+) Ð Chassis ground (þ):
B6M0968A
:Is the voltage more than 10 V?
: Go to step5B31.
: Repair wiring harness between security
control module and main fuse box.
3. GROUND CIRCUIT
5B31 : CHECK GROUND CIRCUIT.
Measure resistance between security control mod-
ule connector (B93) and chassis ground.
Connector & terminal
(B93) No. 14 (+) Ð Chassis ground:
B6M0969A
:Is the resistance less than 10W?
: Go to step5F11.
: Repair wiring harness between security
control module and chassis ground.
70
6-2[T5B2]DIAGNOSTICS
5. Security System

C: ELECTRICAL COMPONENTS LOCATION
S6M0454A
(1) Horn
(2) Keyless entry control module
(3) Security control module (under
console box)
(4) Security indicator light (in combi-
nation meter)(5) Horn relay (in main fuse box)
(6) Rear gate latch switch
(7) Interrupt relay (behind the fuse
box)
(8) Door switch(9) Passive arm connector (on driver
side front lower pillar)
71
[T5C0]6-2DIAGNOSTICS
5. Security System

D: SCHEMATIC
s6m0455
S6M0455
72
6-2[T5D0]DIAGNOSTICS
5. Security System

s6m0456
S6M0456
73
[T5D0]6-2DIAGNOSTICS
5. Security System

E: CONTROL MODULE I/O SIGNAL
B6M0972
Content Terminal No. Measuring condition
Empty 1 Ð
Ignition switch (ON) 2 (INPUT) Battery voltage is present when ignition switch is turned ON.
Passive arm 3 Ð
Empty 4 Ð
Door switch and rear gate latch
switch5 (INPUT) 0 V is present when any door is open.
Empty 6 Ð
Keyless entry control module 7 Ð
Keyless entry control module 8 Ð
Security indicator light 9 (OUTPUT) 0 V is present when activating the alarm operation.
Keyless entry control module 10 Ð
Power supply for clearance light
(Back-up)11 Battery voltage is constantly present.
Clearance light 12 (OUTPUT) Battery voltage is present when activating the alarm operation.
Power supply (Back-up) 13 Battery voltage is constantly present.
Ground 14 Ð
Interrupt relay 15 (OUTPUT) 0 V is present when activating the alarm operation.
Empty 16 Ð
Empty 17 Ð
Empty 18 Ð
74
6-2[T5E0]DIAGNOSTICS
5. Security System