What's Not working , Power door locks , power windows ? Power door looks are controlled by the BCM - body control module .
The power door lock system consists of the following components:
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Driver door lock switch--Uses a single signal wire for both lock and unlock switch activations
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Front passenger door lock switch--Uses a single signal wire for both lock and unlock switch activations
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Body control module (BCM)--Class 2 module which requires programming when replaced
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Reversible door lock actuators in each of the doors
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Body control module PWR 15A fuse--Located in the body control module fuse panel, supplies power for the door lock system
The BCM PWR fuse supplies battery positive voltage to the BCM for the door lock system.
The BCM supplies and monitors a reference voltage to the door lock switch through the door lock switch lock/unlock signal circuit. The door lock switch also receives a constant ground source. If a door lock switch is placed in the lock position, the reference voltage is taken directly to ground and the BCM senses 0.0 volts on the signal circuit. If a door lock switch is placed in the unlock position, the reference voltage is taken to ground through a 1.5K ohm resistor that is internal to the door lock switches and senses approximately 2.9 volts on the signal circuit. This is how the BCM determines what portion of the door lock switch was activated.
The BCM, upon receipt of a door lock switch lock or unlock signal, will switch the appropriate door lock actuator control circuits to battery positive voltage. The opposing side of the door lock actuators are connected to ground internally within the BCM through the other door lock actuator control circuit and the doors will lock or unlock appropriately.
Vehicles without keyless entry have two internal drivers in the BCM to control the door lock actuators. All door lock and all door unlock. Vehicles equipped with keyless entry have three internal drivers in the BCM. Driver door unlock, passenger door unlock and all door lock. This is done to isolate the driver door lock actuator so it can be unlocked by itself using the keyless entry transmitter.
Check the wire lume that runs from the body to the door inside a rubber bellow. the wires can break from constant moving and I'm not sure what vehicle you have, but this is a defect for a few vehicles out there the wire can be to short in some cases from cost saving manufacturing. It may be necessary to remove the door panel and remove the harness through the wire opening to be able to move the boot far enough to access the broken wire or even just to check it in some cases.
How I like to repair it, is to put a new wire through the entire pivot point and join it inside the door and body where the wire does not move constantly.
Hope this helps
Fig. 2 03 Door lock wiring diagram-1992-93 Celica
Fig. 2 04 Door lock wiring diagram-1992-93 Celica
Fig. 1 64 Power window wiring diagram-1992-93 Celica
Hope this helps; keep us updated.
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