SL-21
Keyless Entry System
SECURITY AND LOCKS
6. CHECK KEY WARNING SWITCH
Step
Check
Yes
No
1
CHECK KEY WARNING SWITCH.
1) Prepare the Subaru Select Monitor kit.
2) Run the “PC application for Subaru Select
Monitor”.
3) On «System Selection Menu» display,
select {Integ. unit mode}.
4) Select {Current Data Display & Save}.
5) Select the {key-lock warning SW}.
Is the normal input signal dis-
played when the key is inserted
in/removed from the ignition
switch?
The key warning
switch is OK.
Go to step
2.
2
CHECK FUSE.
Remove and visually check fuse No. 14 (in the
main fuse box).
Is the fuse blown out?
Replace the fuse
with a new part.
Go to step
3.
3
CHECK KEY WARNING SWITCH CIRCUIT.
1) Disconnect the harness connector of body
integrated unit.
2) Insert the key into ignition switch. (LOCK
position)
3) Measure the voltage between harness con-
nector terminal and chassis ground.
Connector & terminal
(B279) No. 2 (+) — Chassis ground (–):
Is the voltage 9 V or more?
Go to step
4.
Go to step
5.
4
CHECK KEY WARNING SWITCH CIRCUIT.
1) Remove the key from ignition switch.
2) Measure the voltage between harness con-
nector terminal and chassis ground.
Connector & terminal
(B279) No. 2 (+) — Chassis ground (–):
Is the voltage 1.5 V?
Replace the body
integrated unit.
<Ref. to SL-48,
Body Integrated
Unit.>
Go to step
5.
5
CHECK KEY WARNING SWITCH.
1) Disconnect the key warning switch harness
connector.
2) Insert the key into ignition switch. (LOCK
position)
3) Measure the resistance between key warn-
ing switch terminals.
Connector & terminal
(B350) No. 3 — No. 4:
Is the resistance less than 1 Ω? Go to step
6.
Replace the key
warning switch.
6
CHECK KEY WARNING SWITCH.
1) Remove the key from ignition switch.
2) Measure the resistance between key warn-
ing switch terminals.
Connector & terminal
(B350) No. 3 — No. 4:
Is the resistance 1 MΩ or
more?
Check the follow-
ing:
• Harness for
open circuits and
shorts between the
key warning switch
and fuse.
• Harness for
open or short
between the body
integrated unit and
key warning switch
Replace the key
warning switch.