Lexus RX300 (MCU15). Manual — part 119
I04489
–
BODY ELECTRICAL
POWER SOURCE
BE–23
LEXUS RX300 (RM785E)
GAUGE
32 – Ground
IG switch ON
Battery voltage
RR WIP
33 – Ground
IG switch ON
Battery voltage
STOP
36 – Ground
Constant
Battery voltage
DBD
37 – Ground
Constant
Battery voltage
SEAT HTR
39 – Ground
Constant
Battery voltage
STARTER
41 – Ground
IG switch START
Battery voltage
WASHER
43 – Ground
IG switch ON
Battery voltage
FR DEF
48 – Ground
Constant
Battery voltage
SRS–B
49 – Ground
Constant
Battery voltage
TAIL
52 – Ground
Light control switch TAIL or HEAD
Battery voltage
PANEL
54 – Ground
Light control switch TAIL or HEAD
Battery voltage
(b)
Remove the relay from the instrument junction block and inspect the connector on the junction block
side.
Relay
Tester connection
Condition
Specified condition
TAILLIGHT
1 – Ground
2 – Ground
4 – Ground
Constant
Light Control switch TAIL or HEAD
Constant
Battery voltage
Continuity
Battery voltage
I04490
BE–24
–
BODY ELECTRICAL
POWER SOURCE
LEXUS RX300 (RM785E)
FOG
5 – Ground
7 – Ground
Light control switch TAIL
Constant
Battery voltage
Battery voltage
ACC
9 – Ground
10 – Ground
11 – Ground
12 – Ground
IG switch ACC or ON
Constant
Constant
Constant
Battery voltage
Continuity
Continuity
Battery voltage
If the circuit is as specified, inspect the circuit connected to other parts.
6.
INSPECT RELAY BLOCK NO. 1 CIRCUIT
Remove the relay from the relay block No. 1 and inspect the connector on the relay block side.
Relay
Tester connection
Condition
Specified condition
CIRCUIT OPENING
1 – Ground
5 – Ground
IG switch ON
IG switch ON
Battery voltage
Battery voltage
REAR FOG
7 – Ground
LIGHT
9 – Ground
Light control switch TAIL
Light control switch TAIL
Battery voltage
Battery voltage
MIRROR HEATER
10 – Ground
12 – Ground
IG switch ON
Constant
Battery voltage
Battery voltage
If the circuit is as specified, inspect the circuit connected to other parts.
BE01L–14
I07352
Ignition Switch
Key Unlock Warning Switch
–
BODY ELECTRICAL
IGNITION SWITCH AND KEY UNLOCK WARNING
SWITCH
BE–25
LEXUS RX300 (RM785E)
IGNITION SWITCH AND KEY UNLOCK WARNING SWITCH
LOCATION
BE0H4–05
I01256
1
2
3
4
5
6
7
8
LOCK
ACC
ON
START
I04031
From Back Side
LOCK
ACC
ON
START
BE–26
–
BODY ELECTRICAL
IGNITION SWITCH AND KEY UNLOCK WARNING
SWITCH
LEXUS RX300 (RM785E)
INSPECTION
1.
INSPECT IGNITION SWITCH CONTINUITY
Switch position
Tester connection
Specified condition
LOCK
–
No continuity
ACC
2 – 3
Continuity
ON
2 – 3 – 4
6 – 7
Continuity
START
1 – 2 – 4
6 – 7 – 8
Continuity
If continuity is not as specified, replace the switch.
2.
INSPECT IGNITION SWITCH CIRCUIT
Connect the switch connector and inspect the connector on
wire harness side from the back side, as shown.
Tester connection
Condition
Specified condition
2 – Ground
Constant
Battery voltage
3 – Ground
Ignition switch ACC or ON
Battery voltage
4 – Ground
Ignition switch ON
Battery voltage
6 – Ground
Ignition switch ON or START
Battery voltage
7 – Ground
Constant
Battery voltage
8 – Ground
Ignition switch START
Battery voltage
If circuit is not as specified, inspect the circuits connected to oth-
er parts.
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