Lexus SC300 / Lexus SC400. Manual — part 206
IGNITION SWITCH
Description
The ignition switch is supplied with power from the battery via a fusible link. Power is supplied to each fuse
and relay according to the position of the switch, whether “CC” ‘‘ON” or “START”. The key unlock warning
switch, which detects the set condition of the key, is built into this switch.
Parts Location
Wiring and Connector Diagrams
–
BODY ELECTRICAL SYSTEM
Ignition Switch
BE–25
Parts Inspection
(Ignition Switch and Key Unlock
Warning Switch)
REMOVAL AND INSTALLATION OF
IGNITION SWITCH AND KEY UNLOCK
WARNING SWITCH
1. DISCONNECT
BATTERY
TERMINALS
CAUTION: Work must be started after approx. 20 se-
conds or longer from the time the ignition switch is
turned to the ”LOCK” position and negative (–) terminal
cable is disconnected from the battery.
2.
REMOVE FOLLOWING PARTS:
(See page
•
No. 1 under cover
•
No. 1 lower finish panel
•
Console box assembly
•
Instrument panel lower center
3.
REMOVE IGNITION SWITCH
(a) Disconnect
connector.
(b) Remove three screws and the switch from the key
cylinder and wire harness clamp.
4.
INSTALL IGNITION SWITCH
For installation, follow the removal procedure in reverse.
INSPECTION OF IGNITION SWITCH AND
KEY UNLOCK WARNING SWITCH
1.
INSPECT IGNITION SWITCH
(Switch continuity)
Inspect the switch continuity between terminals.
Terminal
Switch position
LOCK
ACC
ON
START
If continuity is not as specified, replace the switch.
BE–26
–
BODY ELECTRICAL SYSTEM
Ignition Switch
(Switch circuit)
Connect the switch connector and inspect the connector on
the wire harness side from the back side as shown.
Check for
Tester connection
Condition
Specified value
Voltage
2–Ground
Ignition switch turned to ON
Battery voltage
3–Ground
Ignition switch turned to ACC or ON
4–Ground
Constant
5–Ground
Ignition switch turned to START
6–Ground
Ignition switch turned to ON
11–Ground
Constant
If circuit is not as specified, inspect the switch or refer to
wiring diagram and inspect the circuits connected to
other parts.
2.
INSPECT KEY UNLOCK WARNING SWITCH
(Switch continuity)
Inspect the switch continuity between terminals.
Terminal
Switch position
ON
OFF
(Ignition Key removed)
(Ignition Key set)
If continuity is not as specified, replace the switch.
(Switch circuit)
Connect the switch connector and inspect the connector on
the wire harness side from the back side as shown.
Check for
Check connection
Condition
Specified value
Continuity
10–Ground
Ignition key removed
No continuity
Ignition key set
Continuity
9–Ground
Constant
Continuity
If circuit is not as specified, inspect the switch or wire harness.
–
BODY ELECTRICAL SYSTEM
Ignition Switch
BE–27
LIGHTING SYSTEM
BE–28
–
BODY ELECTRICAL SYSTEM
Lighting System
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