Toyota Camry Manual page 310

O/D OFF indicator light remains ON
Check O/D main switch.
Check harness and connector between
O/D off indicator light and O/D main
switch, O/D off indicator light and ECM.
Check and replace ECM.
O/D OFF indicator light blinks
Perform diagnostic code check (See page AX2–55).
WIRING DIAGRAM
( * ) O/D Main Switch
Contacts go off with switch pushed in.
Contacts go on with switch pushed out.
AUTOMATIC TRANSAXLE – TROUBLESHOOTING
Replace O/D main switch.
Repair or replace harness or con–
nector.
AX2–123