Lexus SC300 / Lexus SC400. Manual — part 732
STARTER RELAY
INSPECTION OF STARTER RELAY
1.
DISCONNECT CABLE FROM NEGATIVE TERMINAL OF
BATTERY
CAUTION: Work must be started after approx. 20 seconds or
longer from the time the ignition switch is turned to the
”LOCK” position and the negative (–) terminal cable is dis-
connected from the battery.
2. REMOVE
STATER
RELAY
LOCATION: In the engine compartment relay box.
3. INSPECT
STARTER
RELAY
A. Inspect relay continuity
(a) Using an ohmmeter, check that there is continuity
between terminals 1 and 2.
(b) Check that there is no continuity between terminals 3
and 5.
If continuity is not as specified, replace the relay.
B. Inspect relay operation
(a) Apply battery voltage across terminals 1 and 2.
(b) Using an ohmmeter, check that there is continuity
between terminals 3 and 5.
If operation is not as specified, replace the relay.
4.
REINSTALL STARTER RELAY
5. RECONNECT CABLE TO NEGATIVE TERMINAL OF
BATTERY
NEUTRAL START SWITCH
(See AT section)
THEFT DETERRENT SYSTEM
(See BE section)
–
STARTING SYSTEM
Starter Relay, Neutral Start Switch, Theft Deterrent
System
ST–35
).
WIRING DIAGRAM
Actuator Power Source Circuit
CIRCUIT DESCRIPTION
This is the power source for the motor.
DIAGNOSTIC CHART
DIAGNOSTIC CHART
SR–66
–
STEERING
STEERING COLUMN
NG
OK
OK
NG
INSPECTION PROCEDURE
1
Check voltage between terminals +B and GND of ECU connector.
C
OK
P
Remove ECU with connectors still connected.
Measure voltage between terminals +B and GND of
ECU connector.
Voltage:
10 – 14 V
Proceed to next circuit inspection shown on matrix chart
(See page
2
Check continuity between terminal GND of ECU connector and body ground.
OK
P
Measure resistance between terminal GND of ECU con-
nector and body ground.
Condition: Continuity
Repair or replace harness or connector.
Go to Step
.
–
STEERING
STEERING COLUMN
SR–67
OK
NG
3
Check PWR fusible link.
C
OK
P
Remove PWR fusible link from J/B No. 1.
Check continuity of PWR fusible link.
Continuity
Check for short in all the harness and components con-
nected to the PWR fusible link (See
).
Check harness and connector between ECU and
battery (See page
).
SR–68
–
STEERING
STEERING COLUMN
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