How do i fix a D Squib Circuit and what is it

there is a TSB available if you're under 60,000 miles take it the dealer.

light occurs when:The center airbag sensor assembly receives an open circuit signal in the side squib (front passenger side) circuit for 2 seconds.

possible trouble areas include:Front seat airbag assembly RH (side squib (front passenger side)), Center airbag sensor assembly, & No. 2 floor wire.

Mel, I am pretty sure D squib circuit pertains to the SRS/air bag system, with a good scanner the squib circuit can be diagnosed better, probably down to the faulty sensor/part.
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http://www.toyotanation.com/forum/61-2nd-generation-2005-2015/260742-airbag-light-came-2.html

did you google(using toyota directives>?)

Air bags bad.
get the FSM and read every word and the extreme dangers messing here.
no year stated
no model car. no car actually stated? wow.
no country. SSDD.
ok go to alldata.com and read.
or buy the FSM.
Squib is the explosive device, is faulting.
a squib means a low power explosive.
used in big guns to test fire , or clear a barrel or for parades ,etc.
name was stolen to car industry.
in Viet Nam we called it a short round ( it was , short)
in the car they are shot gun load sizes, and are to be respected at all times. killed many a would be mechanic.

the bad reads open circuit , or the wire is cut or the connector bad
or the bag is SHOT.
random toy , i guessed for you .
http://library.worldtracker.org/Car%20Manuals/Toyota%20Echo%202000-2002%20Approved/techinfo.toyota.com/ileaf/02toyrm/02toypdf/02rmsour/2002/02echorm/di/rs/cib01065.pdf


FSM , DTC index list
Trouble Code Conditions:
* Open circuit in P squib wire harness or P- wire harness of squib * P squib malfunction * Airbag sensor assembly malfunction
Possible Causes:

• *Front passenger airbag assembly (P squib)
• * Airbag sensor assembly
• * Wire harness

tread lightly fooling with air bags or BOOM.

have it checed out by a air bag technitcian open squib means no contact in a squib need to be fixed

It sounds like you have a bad clock spring unit located behind the steering wheel.What are the OBD11 codes.You have to be very carfull when servicing Air Bag systems you can set off the air bag and hurt yourself with static elec spark.

lett side seat thorax squib 1 circuit open

thorax squib circuit