Toyota ST185 Series Repair Manual page 115

SYSTEM OUTLINE
THIS SYSTEM ALLOWS EASIER ENTRY AND EXIT BY THE DRIVER BY MOVING THE STEERING POSITION TO THE UPPER POSITION
WHEN THE IGNITION KEY IS REMOVED.
CURRENT ALWAYS FLOWS FROM THE POWER FUSE TO TERMINAL 1 OF AUTO TILT AWAY ECU. WHEN THE IGNITION SW IS TURNED
ON, CURRENT FLOWS FROM THE GAUGE FUSE AS FAR AS TERMINAL 6.
1. TILT–UP OPERATION
WHEN IGNITION KEY IS REMOVED FROM THE IGNITION KEY CYLINDER (UNLOCK WARNING SW OFF), A WARNING SW OFF SIGNAL
IS INPUT TO TERMINAL 2 OF THE AUTO TILT AWAY ECU. AS A RESULT, THE AUTO TILT AWAY OPERATES AND CURRENT FLOWS
FROM TERMINAL 4 OF THE AUTO TILT AWAY ECU
TERMINAL 5 OF THE AUTO TILT AWAY ECU, CAUSING THE ACTUATOR TO ROTATE AND RELEASE THE LOCK MECHANISM
LOCKED AT THE MEMORY POSITION (THE POSITION SELECTED USING THE TILT ADJUSTMENT LEVER). THE STEERING WHEEL THE
MOVES FROM THE MEMORY POSITION TO THE UPPER POSITION USING SPRING FORCE, THEN MECHANICAL LOCK OCCURS.
2. TILT RETURN OPERATION
WHEN THE IGNITION KEY IS INSERTED INTO THE IGNITION KEY CYLINDER (UNLOCK WARNING SW ON), A WARNING SW ON SIGNAL
IS INPUT TO TERMINAL 2 OF THE AUTO TILT AWAY ECU. AS A RESULT, THE AUTO TILT AWAY ECU OPERATES AND CURRENT
FLOWS FROM TERMINAL 5 OF THE AUTO TILT AWAY ECU
TERMINAL 1 TERMINAL 4 OF THE AUTO TILT AWAY ECU, CAUSING THE ACTUATOR TO ROTATE AND RELEASE THE LOCK
MECHANISM LOCKED AT THE UPPER POSITION. THE STEERING WHEEL CAN THEN BE RETURNED BY HAND TO THE MEMORY
POSITION, WHERE MECHANICAL LOCK OCCURS.
SERVICE HINTS
AUTO TILT AWAY ECU
A36
1–GROUND : ALWAYS APPROX. 12 VOLTS
6–GROUND : APPROX. 12 VOLTS WITH IGNITION SW AT ON POSITION
5–GROUND : CONTINUITY WITH IGNITION KEY IN CYLINDER
3–GROUND : ALWAYS CONTINUITY
: PARTS LOCATION
CODE SEE PAGE
A35 26
A36 26
: RELAY BLOCKS
CODE SEE PAGE
2 23
4 24
: JUNCTION BLOCK AND WIRE HARNESS CONNECTOR
CODE SEE PAGE
1E 18
3B 22
: GROUND POINTS
CODE SEE PAGE
ID 30
IG 30
A35 A36
1 2
3 4 5 6
1 2
TERMINAL 1 OF THE AUTO TILT AWAY ACTUATOR
CODE
I 9
J 1
RELAY BLOCKS (RELAY BLOCK LOCATION)
R/B NO. 2 (LEFT KICK PANEL)
R/B NO. 4 (RIGHT KICK PANEL)
JUNCTION BLOCK AND WIRE HARNESS (CONNECTOR LOCATION)
COWL WIRE AND J/B NO. 1 (LEFT KICK PANEL)
COWL WIRE J/B NO. 3 (BEHIND COMBINATION METER)
GROUND POINTS LOCATION
LEFT KICK PANEL
R/B NO. 4 SET BOLT
J 1
A A
A A
( HINT : SEE PAGE 7 )
TERMINAL 2 OF THE AUTO TILT AWAY ACTUATOR
SEE PAGE
26
26
J 6
A A
A A A A
( HINT : SEE PAGE 7 )
ACTUATOR TERMINAL 2
ACTUATOR
CODE SEE PAGE
J 6 26
I 9 BLACK
1
5 X X
117