Toyota Tundra 2005 Service - Repair - Maintenance page 2390

Heater main relay:
*: Relay housing metallic parts
3
2
4 5
3
1
2WD 4HI
4HI 4LO
2
*
1
5
4
D04311
F08010
F07503
TRANSFER − TOUCH SELECT 2−4 AND HIGH−LOW SYSTEM
HINT:
When inspecting the operation described above, use a heater
main relay.
NOTICE:
Be careful not to touch the neighboring terminals or metal-
lic parts of the relay housing when connecting.
(b) 4HI 2WD shift:
Connect lines via a relay as shown in the illustration, then
check that the actuator fork shaft moves from the 4HI to
2WD position.
(c) 4HI 4LO shift:
Connect lines via a relay as shown in the illustration, then
check that the actuator fork shaft moves from the 4HI to
4LO position.
TR−41