Power Source

10A MIR HEATER

B- R 1 2 B- L
2 2

30A DEFOG

1 2 Y- G
2

DEFOG Relay
Y- R 2 1 R R
2 2

B- R 3 5 1 2 R 1 2 GR
2 2 2 2

L- Y
4
W- B 50A HEATER 10A AIRSUS NO. 2
2
1 2 L- Y 5 3 L- B
2 4 4

30A TOWING BRK 50A AIR SUS BR- Y 1 2 W- B

4 4
B 2 1 AIR SUS Relay
2

30A BATT CHG 50A AM1

B- Y 2 1 1 2 W- L
2 2

50A J/B
1 10A SECU/HORN
1 2 L- W
2 1C

30A P P/SEAT
40A TOWING

1 2 L
2 30A D P/SEAT

10A STOP
1 2
1 2 G- W
2 30A POWER

5 3 10A TAIL
15A AC115V INV

1 2 V
2 1 2

15A FR FOG TAIL Relay

1 2 LG
2
15A PWR OUTLET

140A ALT 7. 5A OBD

1 2 1 2 O
2 2
B

25A SEAT HEATER

IG Relay
2 5 3 B- Y 1 2 LG
2 2 2

1 2 W- B
2 2

Y- R
B

2
Battery

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2003 4RUNNER (EWD514U)
 HEATER Relay
W- G 1 2 L
2 2
7. 5A HEATER NO. 2

R 5 3 B- Y 1 2 G- Y
2 2 2 2

4
W- B
2

I18
Ignition SW

ACC 3 W- G

W- L 2 AM1 IG1 4 L- Y

W- L 30A AM2

1 2 R 7 AM2 IG2 6 B- R
2
ST2 8 G- B
40A ABS MTR

1 2 Y- B
2

50A ABS SOL

1 2 Y
2

Short Pin
1 2 W W
2

20A EFI

1 2 L L
2

7. 5A ALT- S 10A ETCS

W 2 1 1 2 GR
2 2

10A HORN 20A DR/LCK 10A HEAD(HI RH)

W- G 2 1 1 2 G- W 1 2 R- W
2 2 2

15A A/F HEATER 20A TOWING 10A HEAD(HI LH)

B- R 2 1 1 2 GR 1 2 R- L
2 2 2 2

15A TRN- HAZ 20A RADIO NO. 2 10A HEAD(LO RH)

R- B

B- Y 2 1 1 2 W- L 1 2 R- B
2 2 2

10A HEAD(LO LH)

HEAD Relay
5 3 R- B 1 2 R- Y
2 2 2

1 2 W
2

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2003 4RUNNER (EWD514U)
Power Source

7. 5A ACC

5 10A CIG
W- G
1D

15A IG1

10A ECU- IG

15A RR WSH

W- G 20A 4WD

2 30A FR WIP- WSH

L- Y
1C

10A IGN

6 7. 5A GAUGE
B- R
1D
G- B 10A SRS

3 7. 5A STA NO. 2
1D

10A DOME

1 2 R
2

20A RADIO NO. 1

W 1 2 L- Y
2 2

10A ECU- B

L 1 2 W- R
2

EFI Relay
W- G 1 2 W- B
2 2
10A EFI NO. 2

L 5 3 B 1 2 L- W
2 2 2 2
(2UZ- FE) (2UZ- FE)

60
2003 4RUNNER (EWD514U)
 Service Hints
HEAD Relay
5-3 : Closed with light control SW at HEAD position or dimmer SW at FLASH position
Closed with engine running and parking brake lever released (w/ daytime running light)
I18 Ignition SW
2-3 : Closed with ignition key at ACC or ON position
2-4 : Closed with ignition key at ON or ST position
7-6 : Closed with ignition key at ON or ST position
7-8 : Closed with ignition key at ST position
TAIL Relay
3-5 : Closed with light control SW at TAIL or HEAD position

: Parts Location
Code See Page Code See Page Code See Page
I18 37

: Relay Blocks

Code See Page Relay Blocks (Relay Block Location)

2 22 Engine Room R/B (Engine Compartment Left)
4 23 Engine Room R/B No.4 (Engine Compartment Left)

: Junction Block and Wire Harness Connector

Code See Page Junction Block and Wire Harness (Connector Location)
1C
24 Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
1D

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2003 4RUNNER (EWD514U)