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DTC B1E27 Multichannel Driver CH3 Defective (Open/Short)
 
 
cautionBefore replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
TROUBLE JUDGMENT
If the daytime running light fails, the ETACS-ECU will set DTC No. B1E27.
 
 
TECHNICAL DESCRIPTION (COMMENT)
DTC No. B1E27 will be set if the ETACS-ECU detects a short to power supply between the daytime running light relay and the ETACS-ECU.
 
 
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
Required Special Tools:
  • MB992006: Extra fine probe
  • MB991223: Harness set
STEP 1. Check of short to power supply circuit in IDRL line between the DRL relay connector and ETACS-ECU connector.
Is the check result normal?
Go to Step 2.
Repair the connector(s) or wiring harness.
 
STEP 2. Using scan tool (M.U.T.-IIISE), Check whether the DTC is set again.
Check again if DTC No.B1E27 is set in the ETACS-ECU.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect Scan Tool (M.U.T.-IIISE) ."
(2) Erase the DTC.
(3) Turn the electric motor switch from the "OFF" position to the "ON" position.
(4) Release the parking brake lever.
(5) Check if DTC is set.
Is the DTC set?
Replace the ETACS-ECU.
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).