O/D Main Switch & O/D OFF Indicator Light Circuit

CIRCUIT DESCRIPTION
The O/D main switch contacts go off when the switch is pushed in and come on when it is pushed out. In O/D main switch OFF position, the O/D OFF indicator lights up, and the Engine Control Module (ECM) prohibits shifting to overdrive. The ECM also causes the O/D OFF indicator light to blink when a malfunction is detected. In this case, connecting the OBD II scan tool or LEXUS hand-held tester to the DLC3 can display the diagnostic trouble code.




DIAGNOSTIC CHARTS
O/D OFF indicator light does not light up.




O/D OFF indicator light remains on.




WIRING DIAGRAM
(*) O/D Main Switch: contacts go off with switch pushed in. Contacts go on with switch pushed out.













INSPECTION PROCEDURE