Inspect Back Door Lock Motor Operation

WARNING: This page is about a different car, the 2002 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.

Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead to terminal 4, and check that the door lock cable moves to UNLOCK position.

Fig 1: Testing Back Door Lock Motor
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Reverse the polarity and check that the door lock cable moves to LOCK position.
If operation is not as specified, replace the door lock motor.
Inspect back door unlock detection switch continuity

Fig 2: Identifying Back Door Unlock Detection Switch Positions & Terminals
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Fig 3: Back Door Unlock Detection Switch Specifications
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If continuity is not as specified, replace the back door lock motor.
Inspect back door key lock and unlock control switch continuity :

Fig 4: Identifying Back Door Key Lock & Unlock Control Switch Positions & Terminals
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Fig 5: Back Door Key Lock & Unlock Control Switch Specifications
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If continuity is not as specified, replace the switch.