DTC 20 - Operation Signal To Rear Window Defroster Relay On/Off Signal

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

Fig 1: Identifying Instrument Cluster Connector Terminals (DTC 20)

Courtesy of MAZDA MOTORS CORP.

DIAGNOSTIC PROCEDURE - DTC 20

INSPECTION	INDICATION	SITUATION	ACTION
Wait for 2 seconds after selecting DTC 20.	on (Turns on and off)	Rear window defroster relay turns on and off three times .	Rear window defroster relay is okay.
Wait for 2 seconds after selecting DTC 20.	on (Turns on and off)	Other than stated above.	Measure voltage at instrument cluster terminal 2P. Is voltage B+ ? If as specified, replace instrument cluster. If not as specified, inspect following parts. Rear window defroster relay Wiring harness (Instrument cluster - rear window defroster relay)