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How To Check Ecus

WARNING: This page is about a different variant/trim than selected.
  1. Use the scan tool MB991958 and the SWS monitor kit to check ECUs.
  2. The following ECUs can be checked by using the scan tool MB991958 and the SWS monitor kit.
NOTE: The "ECU COMM Check" function checks the 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 CONDITIONS

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 line are normal
ETACS-ECU ETACS ECU OK All of the ETACS-ECU switch, power supply, ground and interconnecting communication line are normal
Front-ECU FRONT ECU OK*2 All of the front-ECU, power supply, ground and interconnecting communication line are normal
Sunroof motor assembly (sunroof-ECU) SUNROOF ECU OK*2 All of the sunroof motor assembly, power supply, ground and interconnecting communication line 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".
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