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SYSTEM OUTLINE
Current always flows to TERMINAL 3 of the integration relay through the POWER fuse.
1. MANUAL LOCK OPERATION
To push the door lock control SW or door key lock and unlock SW to LOCK position, a lock signal is input to the integration
relay and causes the relay to function. Current flows from TERMINAL 3 of the relay to TERMINAL 13 to TERMINAL 2 of the
door lock motors to TERMINAL 3 to TERMINAL 12 of the relay to TERMINAL 8 to GROUND and the door lock motor causes
the door to lock.
2. MANUAL UNLOCK OPERATION
To push the door lock control SW or door key lock and unlock SW to UNLOCK position, an unlock signal is input to the
integration relay and causes the relay to function. Current flows from TERMINAL 3 of the relay to TERMINAL 12 to
TERMINAL 3 of the door lock motors to TERMINAL 2 to TERMINAL 13 of the relay to TERMINAL 8 to GROUND and the
door lock motor causes the door to unlock.
3. DOUBLE OPERATION UNLOCK OPERATION
When the door key lock and unlock SW LH is turned to unlock position, only the front LH door is mechanically unlocked.
Turning the door key lock and unlock SW LH to the unlock side causes a signal to be input to the relay, and if the signal is
input again within 3 seconds by turning the door key lock and unlock SW LH to the unlock side again, current flows from
TERMINAL 12 of the integration relay to TERMINAL 3 of the door lock motors, TERMINAL 2 to TERMINAL 13 of the
integration relay to TERMINAL 8 to GROUND, causing the door lock motors to operate and unlock the doors.
4. KEY CONFINE PREVENTION FUNCTION
∗ Operating door lock knob (In door lock motor operation)
With ignition key in cylinder (Unlock warning SW on), when any door is opened and locked using door lock knob (Door
lock motor), the door is locked once but each door is unlocked soon by the function of the integration relay. As a result,
current flows from TERMINAL 3 of the relay to TERMINAL 12 to TERMINAL 3 of the door lock motors to TERMINAL 2 to
TERMINAL 13 of the relay to TERMINAL 8 to GROUND and causes all the doors to unlock.
∗ Operating door lock control SW or door key lock and unlock SW
With ignition key in cylinder (Unlock warning SW on), when any door is opened and locked using the door lock control
SW or door key lock and unlock SW, all doors are locked once but each door is unlocked by the function of the SW
contained in motor, which inputs the signal to the integration relay. According to this input signal, current flows from
TERMINAL 3 of the relay to TERMINAL 12 to TERMINAL 3 of the door lock motors to TERMINAL 2 to TERMINAL 13 of
the relay to TERMINAL 8 to GROUND and causes all the doors to unlock.
SERVICE HINTS
INTEGRATION RELAY
8–GROUND : Always continuity
3–GROUND : Always approx. 12 volts
12–GROUND : Approx. 12 volts for 0.2 seconds with following operations
∗ Door lock control SW unlocked
∗ Door lock control SW locked with ignition key in cylinder and LH or RH door open
(Ignition key reminder function)
∗ Door lock knob locked with ignition key in cylinder and LH or RH door open. (Ignition key reminder function)
∗ Unlocking the LH, RH door cylinder with key
13–GROUND : Approx. 12 volts for 0.2 seconds with following operations
∗ Door lock control SW locked
∗ Locking the LH, RH door cylinder with key
14–GROUND : Continuity with front LH door open
15–GROUND : Continuity with front RH door open (Standard cab)
15–GROUND : Continuity with front RH, rear LH, RH door open (Access cab)
D16, D17 DOOR COURTESY SW FRONT LH, RH
1–GROUND : Closed with door open
D22, D23 DOOR KEY LOCK AND UNLOCK SW LH, RH
1–2 : Closed with door lock cylinder locked with key
3–2 : Closed with door lock cylinder unlocked with key
D25, D26 DOOR LOCK MOTOR AND DOOR UNLOCK DETECTION SW LH, RH
4–1 : Closed with door lock knob UNLOCK position
U1 UNLOCK WARNING SW
1–2 : Closed with key in cylinder
2003 TOYOTA TUNDRA (EWD491U)
187
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