Ignition Switch: Description and Operation

INTRODUCTION TO IGNITION SWITCH DIAGNOSIS
An ETACS-ECU is mounted in all vehicles. This ETACS-ECU controls the ignition key reminder and ignition key hole illumination light timer. The ignition key reminder tone alarm alerts the driver that the ignition key has not been removed. If any of the following symptoms occur, there is a malfunction:
- The tone alarm does not stop sounding when the ignition key is turned to the "ON" position.
- The tone alarm does not stop sounding when the ignition key is removed.
- The tone alarm does not sound when the ignition key is inserted (turned to the "OFF" position) and the driver's door is opened.

The ignition key hole illumination light timer illuminates the ignition switch for certain conditions. If any of the following symptoms occur, there is a malfunction:
- The ignition key hole illumination light does not go off.
- The ignition key hole illumination light does not illuminate when the driver's door is opened.
- The ignition key hole illumination light does not go out when the ignition key is turned to the "ON" position.


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