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DTC B1E20 +Battery Roomlight deactivated (FET failure)
 
 
cautionBefore replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
TROUBLE JUDGMENT
DTC No. B1E20 will be set when the ETACS-ECU detects an internal fault at HI side of the dome light.
 
 
TECHNICAL DESCRIPTION (COMMENT)
DTC No. B1E20 will be set when the ETACS-ECU detects a internal fault at HI side of the dome light.
 
 
TROUBLESHOOTING HINTS
  • The wiring harness or connectors may have loose, corroded, or damaged terminals, or terminals pushed back in the connector
  • The ETACS-ECU may be defective
 
 
DIAGNOSIS
Using scan tool (M.U.T.-IIISE), check whether the other DTC is set.
Check if DTC No. B1E1D is set in the ETACS-ECU.
Is the DTC set?
Carry out the troubleshooting for DTC No. B1E1D. On completion, replace the ETACS-ECU when it has not been replaced as the troubleshooting process for DTC No. B1E1D. This is because DTC No. B1E20 cannot be erased.
Replace the ETACS-ECU.