Toyota Camry Manual page 175

AX1–102
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 ECM prohibits shifting
to overdrive. The ECM also causes the O/D OFF indicator light to blink when a malfunction is detected.
However, when the O/D main switch is OFF, the O/D indicator light does not blink, but stays on.
In this case, connecting the terminals in the DLC2 or DLC1 can display the malfunction code.
DIAGNOSTIC CHART
See next page.
WIRING DIAGRAM
AUTOMATIC TRANSAXLE – TROUBLESHOOTING