Service Hints - Toyota Tundra 2003 Electrical Wiring Diagram

POWER SOURCE

SERVICE HINTS

HEATER RELAY
5–3 : Closed with ignition SW on and heater blower SW on
H–LP 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)
I23 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
DIMMER RELAY (w/ DAYTIME RUNNING LIGHT)
3–5 : Closed with HEAD relay on and dimmer SW at HIGH or FLASH position
: PARTS LOCATION
Code
A22 34
I23 35
: RELAY BLOCKS
Code See Page
2 21
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
Code See Page
22 (*2)
1I 1I
26 (*1)
22 (*2)
1K 1K
26 (*1)
: CONNECTOR JOINING WIRE HARNESS AND WIRE HARNESS
Code See Page
IA4 44
* 1 : w/ Daytime Running Light
58
See Page Code
J1 J1
Relay Blocks (Relay Block Location)
Engine Room R/B (Engine Compartment Left)
Junction Block and Wire Harness (Connector Location)
Engine Room Main Wire and Driver Side J/B (Lower Finish Panel) Engine Room Main Wire and Driver Side J/B (Lower Finish Panel)
Joining Wire Harness and Wire Harness (Connector Location)
Engine Room Main Wire and Cowl Wire (Left Kick Panel)
* 2 : w/o Daytime Running Light
2003 TOYOTA TUNDRA (EWD491U)
See Page
31 (2UZ–FE)
33 (5VZ–FE)
* 3 : Bench Seat * 4 : Separate Seat, Captain Seat (w/o Power Seat)
Code See Page
31 (2UZ–FE)
J2 J2
33 (5VZ–FE)