Check Code Inspection

Check code 01 

Check code 01	CAN system
INSPECTION CONDITION	DISPLAY	ACTION
Select the check code 01.	Courtesy of MAZDA MOTORS CORP.	CAN system of information display is normal.
	Courtesy of MAZDA MOTORS CORP.	CAN system communication error. (DTC U2516) (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM] )

Check code 02 

Check code 02		Communication status to audio unit Communication status to climate control unit
INSPECTION CONDITION	DISPLAY		ACTION
Select the check code 02. (The diagnostic results will be displayed once each in the order of audio unit and heater control unit.)	Courtesy of MAZDA MOTORS CORP.		All communications are normal.
	Audio unit	Courtesy of MAZDA MOTORS CORP.	Communication to audio unit is normal.
		Courtesy of MAZDA MOTORS CORP.	Communication error to audio unit. (DTC U0184) (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM] )
		Courtesy of MAZDA MOTORS CORP.	Vehicle without audio unit.
	Climate control unit	Courtesy of MAZDA MOTORS CORP.	Communication to climate control unit is normal.
		Courtesy of MAZDA MOTORS CORP.	Communication error to climate control unit. (DTC U0164) (See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM] )
		Courtesy of MAZDA MOTORS CORP.	Vehicle without climate control unit.

Check code 04 

Check code 04		TNS relay ON/OFF signal
STEP	INSPECTION CONDITION	DISPLAY	ACTION
1	Turn the headlight switch to the TNS position. (TNS relay ON)	Courtesy of MAZDA MOTORS CORP.	Go to the next step.
		Courtesy of MAZDA MOTORS CORP.	Verify that the voltage of information display terminal C is B+.  If the voltage is as specified, replace the information display. If the voltage is not as specified, inspect the following parts: TNS relay Wiring harness (Battery-TNS relay-information display)
2	Turn the headlight switch off. (TNS relay OFF)	Courtesy of MAZDA MOTORS CORP.	Verify that the voltage of the information display terminal C is 1.0 V or less.  If the voltage is as specified, replace the information display. If the voltage is not as specified, inspect the following parts: TNS relay Wiring harness (TNS relay-information display)
		Courtesy of MAZDA MOTORS CORP.	Input signal to the information display is normal.

Check code 06 

Check code 06		Ignition switch ON/OFF signal
STEP	INSPECTION CONDITION	DISPLAY	ACTION
1	Turn the ignition switch to the ON position.	Courtesy of MAZDA MOTORS CORP.	Go to the next step.
		Courtesy of MAZDA MOTORS CORP.	Verify that the voltage of information display terminal E is B+.  If the voltage is as specified, replace the information display. If the voltage is not as specified, inspect the following parts: Ignition switch Wiring harness (Battery-ignition switch-information display)
2	Turn the ignition switch off.	Courtesy of MAZDA MOTORS CORP.	Verify that the voltage of the information display terminal E is 1.0 V or less.  If the voltage is as specified, replace the information display. If the voltage is not as specified, inspect the following parts: Ignition switch Wiring harness (Battery-ignition switch-information display)
		Courtesy of MAZDA MOTORS CORP.	Input signal to the information display is normal.

Check code 07 

Check code 07		Dimmer cancel switch ON/OFF signal
STEP	INSPECTION CONDITION	DISPLAY	ACTION
1	Turn the dimmer cancel switch to the ON position.	Courtesy of MAZDA MOTORS CORP.	Go to the next step.
		Courtesy of MAZDA MOTORS CORP.	Verify that the voltage of information display terminal F is 0 V.  If the voltage is as specified, replace the information display. If the voltage is not as specified, inspect the following parts: Instrument cluster Wiring harness (Information display-instrument cluster)
2	Turn the dimmer cancel switch off.	Courtesy of MAZDA MOTORS CORP.	Verify that the voltage of the information display terminal F is B+.  If the voltage is as specified, replace the information display. If the voltage is not as specified, inspect the following parts: Instrument cluster Wiring harness (Information display-instrument cluster)
		Courtesy of MAZDA MOTORS CORP.	Input signal to the information display is normal.

LCD 

Check code -	LCD
DISPLAY	ACTION
Courtesy of MAZDA MOTORS CORP.	All segments and dots illuminated.	LCD is normal.
	Except above	Replace the information display.