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what position is the control switch in? does this occur when accelerating?
the door that directs air flow is controled by a vacuum motor. the default position for the door directs air flow to the defrost vents in the event of vacuum loss to ensure the windsheild will be clear of mist. if there is a small leak, vacuum will temporarily be removed when accellerating and the motor will revert to the default position. there are vacuum lines from the control knob to the motor you must check these lines for leaks. the diaphram in the motor may be bad. also check the main vacuum supply line to the control knob. usually red in color. if there is a vacuum storage cannister. it may be leaking. this cannister will maintain vacuum for the circuit when accellerating. engine vacuum decreases when accellerating.
If you had your foot on the brake while starting brake light could come on. If a catalytic convertor does not pass at startup (possibly ox sensor or whole convertor) then the computor turns 4wd vsc and check engine light on. note the six cylinder has three catalytic convertors and the four cylinder has two. Very expensive if convertor(s)
you may go to ssangyong, mine has the same, and they say that the 2h 4x4 shift, wants to enter in function, or wants to work, they tight a Nut that is in the front left wheel near de suspension and the noise has gone... Sorry for my english...
Krafty930 with brake, VSC off and ABS lights on. You share a common problem with many Toyota owners. My 2003 Sequioa has the same issue. There is no solution. Dealers will replace the air sensors and then the computer all for $2,500 - $3,500. This will not solve the issue. The internet has thousands of complaints re this problem, but Toyota has disowned the issue and declined resolution, even for vehicles under warranty. The lights drive me crazy and I still don't know if there is a functional problem, a wiring problem or a computer problem with the VSC system. To date, I have learned of no reports relating this problem to vehicular deaths, so I really am not holding my breath waiting for Toyota to provide a solution. Sorry that you share this problem, but perhaps my response will help to stop you from "spinning your wheels" too much trying to resolve this issue.
try disconnecting the negative cable on the battery for 15 minutes then reconnect do this a couple of time if not you may have a module problem being that it's not recommended to jump start a vehicle that's equipped with pcm of any kind good luck
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