Check code 18

WARNING: This page is about a different car, the 2005 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CODE 18 DIAGNOSTIC PROCEDURES

Check code 18	Ignition key illumination on/off signal
INSPECTION CONDITION	DISPLAY	ACTION
After selecting check code 18, wait for approx. 2 8.	on (FLASHING)	Ignition key illumination flashes three times.	The ignition key illumination is normal.
After selecting check code 18, wait for approx. 2 8.	on (FLASHING)	Except above	Verify that the voltage of the instrument cluster terminal 1 K is B+. If the voltage is as specified, replace the instrument cluster. If the voltage is not as specified, replace the following parts: Ignition key illumination Wiring harness (Battery-ignition key illumination- instrument cluster)