I’ve been on several Toyota forums…and the complaint about the VSC light is that it comes on when-ever the ECU detects a fault - EVEN IF IT’S UNRELATED TO THE VSC. Toyota disables traction control and ABS if ANY faults.
There have been several complaints about the VSC light going on without another code…and it all seems to be related to AFTER a OBD-II reader was hooked up.
Directly from the web-site.
Cause: The code reader or other OBDII device has attempted to communicate with the 4Runner using the CAN protocol (involving pin #14) and this has caused the 4Runner to erase the “zero point calibration” numbers in its memory. Without these numbers it can’t get accurate information from the yaw rate and deceleration sensors (in the center console near the gearshift) and so it disables traction and stability control functions.
The fix: Perform the “zero point calibration” procedure as described in TSB BR001-04. This procedure can be performed without special equipment such as a hand-held tester or OBDII reader. You only need the equivalent of a jumper wire to short together two pins of the OBDII connector at the right time and the right number of times between switching the 4Runner on and off. More detail is included below, leveraged from my other posts.