Diagnostic Circuit Check
- Turn ignition on. Release OD switch to OFF position. Ensure OD OFF light on instrument panel illuminates. If OD OFF light does not illuminate, check OD switch and wiring circuit. See WIRING DIAGRAMS .
- Depress OD switch to the ON position. Ensure OD OFF light on instrument panel goes off. If OD OFF light remains on, check OD switch and wiring circuit. If OD OFF light is blinking, check for stored trouble codes. See TCM TROUBLE CODES .