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The following was copied from the 2005 Avalon Features Manual, page CH-55. I have tried it in snow and it does work. Practice in advance hepls a lot. I print these instructions on a laminated card and keep it in the glove box.
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Transition to the service mode (TRAC and VSC OFF mode).
The TRAC and VSC systems can be turned off by following the procedures below:
Using the parking brake and brake pedal:
1) Check that the IGN is off and the shift lever position is at P.
2) Start the engine after turning the IGN to the ON position.
3) Perform the following steps 4 to 8 within 30 seconds after engine start.
4) Turn the parking brake switch on (engage parking brake).
5) Depress and release the brake pedal twice.
6) Turn the parking brake switch on and off (engage and release) twice while depressing the brake pedal.
7) Depress and release the brake pedal twice while the parking brake switch is on.
Notice: Steps 6 and 7 should be performed within 15 seconds each.
8) Check that the VSC warning light and slip indicator are turned on. If they are not turned on, start over
from step 1.
9) The brake control system will return to the normal mode by turning the IGN to the ON position from off.
For additional details regarding transition to the service mode, see the 2005 Avalon Repair Manual (Pub. No. RM1169U).
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