How To Check Ecus

Use the scan tool and the SWS monitor kit to check ECUs. (Refer to M.U.T.-III User's Manual )
The following ECUs can be checked by using the scan tool and the SWS monitor kit.

NOTE: The "ECU COMM Check" function checks communication status of ECUs "NG" does not always mean ECU malfunction. If a malfunction is found by the "ECU COMM Check", proceed to "Symptom Procedure" (Refer to SYMPTOM CHART ).

SWS monitor kit-compatible ECUs and their conditions

PROBLEM SYMPTOM CHART

ECU TO BE CHECKED	DISPLAY ON SCAN TOOL	NORMAL CONDITION	ECU CONDITION
Column switch (column-ECU)	COLUMN ECU	OK*¹	All of the column switch, power supply, ground and interconnecting communication lines are normal
ETACS-ECU	ETACS ECU	OK	All of the ETACS-ECU switch, power supply, ground and interconnecting communication lines are normal
Front-ECU	FRONT ECU	OK*²	All of the front-ECU, power supply, ground and interconnecting communication lines are normal
Sunroof motor assembly (sunroof-ECU)	SUNROOF ECU	OK*²	All of the sunroof motor assembly, power supply, ground and interconnecting communication lines are normal
Other SWS-related ECUs	Other ECUs	NG	ECUs are not used
NOTE: ¹ : If the ignition switch is turned to the "LOCK" (OFF) or "ACC" when "NG" is displayed beside the "ETACS ECU" or the signal request line is abnormal, the scan tool shows "NG" beside the "COLUMN ECU". ² : When "NG" is displayed beside the "ETACS ECU", the scan tool shows "NG" beside the "FRONT ECU" and "SUNROOF ECU".