key battery SUBARU FORESTER 1999 Service Repair Manual

4. Keyless Entry System
A: PRECAUTION
1. SUPPLEMENTAL RESTRAINT SYSTEM
ªAIRBAGº
Airbag system wiring harness is routed near the
keyless entry 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 keyless entry
control module.
B: PRE-INSPECTION
1. POWER DOOR LOCK
4B11 : CHECK POWER DOOR LOCK.
Perform lock and unlock with door lock switch.
:Does the power door lock function
normally?
: Go to step4B21.
: Repair power door lock.
2. TRANSMITTER
4B21 : CHECK TRANSMITTER BATTERY.
1) Remove battery from transmitter.
NOTE:
To prevent static electricity damage to transmitter
printed circuit board, touch steel area of building
with hand to discharge static electricity carried on
body or clothes before disassembling transmitter.
B6M0950
2) Measure voltage battery.
NOTE:
IBattery discharge occurs during measurement.
Complete measurement within 5 seconds.
IDuring battery voltage measurement, voltage
falls more than 1.8 volts during 3 seconds period.
Weak battery is indicated. Replace battery.
S6M0291A
:Is the voltage more than 2 V?
: Go to step4B22.
: Replace transmitter battery. (Use
CR2032 or equivalent.)
53
[T4B2]6-2DIAGNOSTICS
4. Keyless Entry System

4. POWER SUPPLY CIRCUIT
4B41 : CHECK POWER SUPPLY CIRCUIT.
Measure voltage between fuse box connector
(B158) and chassis ground.
Connector & terminal
(B158) No. 8 (+) Ð Chassis ground (þ):
B6M1344B
:Is the voltage more than 10 V?
: Go to step4B42.
: Repair wiring harness between fuse box
and battery.
4B42 : CHECK POWER SUPPLY CIRCUIT.
1) Disconnect connector from keyless entry con-
trol module.
2) Measure voltage between keyless entry control
module connector (B176) and chassis ground.
Connector & terminal
(B176) No. 3 (+) Ð Chassis ground (þ):
B6M0952A
:Is the voltage more than 10 V?
: Go to step4B51.
: Repair wiring harness between keyless
entry control module and fuse box.
5. GROUND CIRCUIT
4B51 : CHECK GROUND CIRCUIT.
Measure resistance between keyless entry control
module connector (B176) and chassis ground.
Connector & terminal
(B176) No. 8 (+) Ð Chassis ground (þ):
B6M0953A
:Is the resistance less than 10W?
: Go to step4F11.
: Repair wiring harness between keyless
entry control module and chassis
ground.
56
6-2[T4B4]DIAGNOSTICS
4. Keyless Entry System

E: CONTROL MODULE I/O SIGNAL
B6M0957
Content Terminal No. Measuring condition
Door and rear gate lock actuator
(Except driver side)1 (OUTPUT)Battery voltage is present when pressing the transmitter UNLOCK/
DISARM button two times.
Door and rear gate lock actuator 2 (OUTPUT)Battery voltage is present when pressing the transmitter LOCK/ARM
button one time.
Power supply (Back-up) 3 Battery voltage is constantly present.
IRoom light
IRear gate latch switch4 (OUTPUT)I0 V is present when pressing the transmitter UNLOCK/DISARM
button one time.
IBattery voltage is present when opening the rear gate.
Door lock switch 5 (INPUT) 0 V is present when operating the door lock switch.
Door switch 7 (INPUT) Battery voltage is present when any door is open.
Ground 8 Ð
Door lock actuator (Driver side) 9 (OUTPUT)Battery voltage is present when pressing the transmitter UNLOCK/
DISARM button one time.
Security control module 10 Ð
Security control module 11 Ð
Horn relay 12 (OUTPUT)0 V is present when pressing the transmitter UNLOCK/DISARM or
LOCK/ARM button.
Security control module 13 Ð
Ignition switch (ON) 14 (INPUT) Battery voltage is present when ignition switch is turned ON.
Door unlock switch 15 (INPUT) 0 V is present when operating the door lock switch.
Key warning switch 16 (INPUT)Battery voltage is present when inserting the key into the ignition
switch.
F: DIAGNOSTICS PROCEDURE
1. BASIC DIAGNOSTICS PROCEDURE
4F11 : CHECK KEYLESS ENTRY FUNC-
TION.
1) Perform pre-inspection.

2) Remove ignition key from ignition switch.
3) Set the room light switch in the middle position.
4) Close all doors and the rear gate.
5) Press the LOCK/ARM button one time.
:Do all doors and rear gate lock nor-
mally?
: Go to step4F12.
: Replace keyless entry control module.
4F12 : CHECK KEYLESS ENTRY FUNC-
TION.
Check if the horn signal chirps.
:Does the horn chirp one time?
: Go to step4F13.
: Go to step4F21.
60
6-2[T4E0]DIAGNOSTICS
4. Keyless Entry System

4F25 : CHECK HORN RELAY.
1) Connect the battery to horn relay terminals No.
3 and No. 4.
2) Check continuity between horn relay terminals.
Terminals
No. 1 Ð No. 2:
B6M1350B
:Does continuity exist?
: Repair wiring harness of horn circuit.
: Replace horn relay.
4F26 : CHECK FUSE.
Remove and visually check the fuse No. 6 (in main
fuse box).
:Is the fuse No. 6 blown?
: Replace fuse (15 A).
: Go to step4F27.4F27 : CHECK POWER SUPPLY FOR
HORN RELAY.
1) Install horn relay to main fuse box.
2) Measure voltage between main fuse box con-
nector (F37) and chassis ground.
Connector & terminal
(F37) No. 4 (+) Ð Chassis ground (þ):
B6M1351A
:Is the voltage more than 10 V?
: Go to step4F28.
: Repair wiring harness between main
fuse box and battery.
64
6-2[T4F2]DIAGNOSTICS
4. Keyless Entry System

4F34 : CHECK POWER SUPPLY FOR
ROOM LIGHT.
1) Disconnect connector from room light.
2) Open any door.
3) Measure voltage between room light connector
(R52) and chassis ground.
Connector & terminal
(R52) No. 2 (+) Ð Chassis ground (þ):
B6M0961A
:Is the voltage more than 10 V?
: Go to step4F35.
: Repair wiring harness between room
light and battery.4F35 : CHECK HARNESS CONNECTOR
BETWEEN ROOM LIGHT AND KEY-
LESS ENTRY CONTROL MODULE.
1) Disconnect connector from keyless entry con-
trol module.
2) Measure resistance between room light con-
nector (R52) and keyless entry control module
connector (B176).
Connector & terminal
(R52) No. 1 Ð (B176) No.4:
B6M0962A
:Is the resistance less than 10W?
: Replace keyless entry control module.

: Repair wiring harness between room
light and keyless entry control module.
66
6-2[T4F3]DIAGNOSTICS
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

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

2.
No.1 Door
\(Door Disconnect
2 Door
\(Door a.
b.
side.Connect
Functionally
3 Door
handle
to a.
b.
adjustmentConnect
Remove
Adjust
is
4 Door
set
\(Keyless a.
b.
adjustedSame
Same
5 Child
b.Refer
6 Inner
mountingEliminate
upper
7
8 Auto
inner Auto
toSame
3.
Symptom
All
move. Driver
doesDriver
dow
move
down.Neither
side
move.
Battery
Fuse
Circuit
Main
Sub \(2\)
Motor
Motor \(3\)
Regulator \(4\)
Power
Ground
Harness \(
39
[K300]5-2DIAGNOSTICS
3.

2.
No.1 Door
\(Door Disconnect
2 Door
\(Door a.
b.
side.Connect
Functionally
3 Door
handle
to a.
b.
adjustmentConnect
Remove
Adjust
is
4 Door
set
\(Keyless a.
b.
adjustedSame
Same
5 Child
b.Refer
6 Inner
mountingEliminate
upper
7
8 Auto
inner Auto
toSame
3.
Symptom
All
move. Driver
doesDriver
dow
move
down.Neither
side
move.
Battery
Fuse
Circuit
Main
Sub \(2\)
Motor
Motor \(3\)
Regulator \(4\)
Power
Ground
Harness \(
39
[K300]5-2DIAGNOSTICS
3.