Lexus RX300 (MCU15). Service manual — part 117
I04481
S Engine Room Junction Block
S Fusible Link Block (Inside Engine Room Junction Block)
Fuse
Relay
1. –
2. H–LP R LWR Fuse
3. H–LP L LWR Fuse
4. HAZARD Fuse
5. AM2 Fuse
6. TEL Fuse
7. FL DOOR Fuse
8. SHORT PIN
9. ALT–S Fuse
10. HORN Fuse
11. EFI Fuse
12. DOME Fuse
13. ECU–B Fuse
14. RAD No. 1 Fuse
15. –
16. –
17. –
18. MAIN M–Fuse
A. Headlight Control Relay
B. Starter Relay
C. RR DEF Relay
D. MG CLT Relay
E. HORN Relay
F. EFI Relay
Fuse
1. ABS H–Fuse
2. ALT H–Fuse
3. RDI FAN M–Fuse
4. CDS FAN M–Fuse
5. RR DEF M–Fuse
6. HEATER M–Fuse
–
BODY ELECTRICAL
POWER SOURCE
BE–15
LEXUS RX300 (RM785E)
I04480
Fuse
1. AM1 M–Fuse
2. POWER M–Fuse
3. IGN Fuse
4. RADIO No. 2 Fuse
5. CIG Fuse
6. D RR DOOR Fuse
7. PWR OUTLET Fuse
8. FR FOG Fuse
9. SRS–IG Fuse
10. ECU IG Fuse
11. WIPER Fuse
12. P RR DOOR Fuse
13. P FR DOOR Fuse
14. S/ROOF Fuse
15. HEATER Fuse
16. GAUGE Fuse
17. RR WIP Fuse
18. STOP Fuse
19. ODB Fuse
20. SEAT HTR Fuse
21. STARTER Fuse
22. WASHER Fuse
24. FR DEF Fuse
25. SRS–B Fuse
26. TAIL Fuse
S Instrument Panel Junction Block
27. PANEL Fuse
Relay
A. Taillight Control Relay
B. Fog Light Relay
C. ACC Relay
23. RR FOG Fuse
BE–16
–
BODY ELECTRICAL
POWER SOURCE
LEXUS RX300 (RM785E)
I04483
S Relay Block No. 1
Relay
A. Circuit Opening Relay
B. Rear Fog Light Relay
C. Mirror Heater Relay
–
BODY ELECTRICAL
POWER SOURCE
BE–17
LEXUS RX300 (RM785E)
The power source supplies power to each of the vehicle’s electrical devices. It is composed of the battery,
fuses and relays, which are located centrally at engine room junction block, engine room No. 1 relay block,
fusible link block and engine room No. 2 relay block in the engine compartment, and instrument panel junc-
tion block in the cabin near the driver’s feet.
BE0U8–02
I04484
BE–18
–
BODY ELECTRICAL
POWER SOURCE
LEXUS RX300 (RM785E)
INSPECTION
1.
INSPECT ENGINE ROOM JUNCTION BLOCK CIRCUIT
(a)
Remove the fuse from the junction block and inspect the connection on the junction block side.
Fuse
Tester connection
Condition
Specified condition
MAIN
2 – Ground
Constant
Battery voltage
H–LP R LWR
3 – Ground
Light control switch HEAD and headlight dimmer
switch LOW beam
Battery voltage
H–LP L LWR
6 – Ground
Light control switch HEAD and headlight dimmer
switch LOW beam
Battery voltage
HAZARD
8 – Ground
Constant
Battery voltage
AM2
9 – Ground
Constant
Battery voltage
TEL
12 – Ground
Constant
Battery voltage
FL DOOR
13 – Ground
Constant
Battery voltage
ALT–S
17 – Ground
Constant
Battery voltage
HORN
20 – Ground
Constant
Battery voltage
EFI
21 – Ground
Constant
Battery voltage
DOME
24 – Ground
Constant
Battery voltage
ECU–B
26 – Ground
Constant
Battery voltage
RAD No.1
27 – Ground
Constant
Battery voltage
If the circuit is as specified, inspect the circuits connected to other parts.
(b)
Remove the relay from the junction block and inspect the connector on the junction block side.
Relay
Tester connection
Condition
Specified condition
HEAD LAMP
29 – Ground
31 – Ground
32 – Ground
Constant
Light control switch HEAD
Constant
Battery voltage
Continuity
Battery voltage
Starter
33 – Ground
34 – Ground
IG switch START and PNP switch P or N position
Constant
Battery voltage
Continuity
Starter
36 – Ground
Constant
Battery voltage
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