Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

CHECK CODE 08 DIAGNOSTIC PROCEDURE

STEP	INSPECTION	INDICATION	ACTION
1	Turn headlight switch to TNS position. (TNS relay on.)	on	Go to next step.
1	Turn headlight switch to TNS position. (TNS relay on.)	off	Measure voltage at instrument cluster terminal 2K. Is voltage B+ ? If as specified, replace instrument cluster. If not as specified, inspect following parts. TNS relay Wiring harness (Battery-TNS relay-instrument cluster)
2	Turn headlight switch off. (TNS relay off.)	on	Measure voltage at instrument cluster terminal 2K. Is voltage 0 V ? If as specified, replace instrument cluster. If not as specified, inspect following parts. TNS relay Wiring harness (Battery-TNS relay-instrument cluster)
2	Turn headlight switch off. (TNS relay off.)	off	Input signal to instrument cluster is okay.