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DTC B1E14 Low Beam Light(LH) Overload or Short Circuit
 
 
cautionBefore replacing the ECU, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
DIAGNOSTIC FUNCTION
DTC B1E14 will be set when the headlight (Low-beam) (LH) control circuit fails.
 
 
TROUBLE JUDGMENT
DTC B1E14 will be set if the ETACS-ECU detects a short between itself and the headlight (Low-beam) (LH).
 
 
TROUBLESHOOTING HINTS
  • Malfunction of the headlight (Low-beam) (LH) bulb
  • Malfunction of the headlight (Low-beam) (LH) assembly
  • Headlight (Low-beam) (LH) control circuit fails
  • Malfunction of the ETACS-ECU
 
 
DIAGNOSIS
Required Special Tools:
  • MB992006: Extra fine probe
  • MB991223: Harness set
STEP 1. Bulb check <Vehicles with halogen headlight>.
Check whether the headlight (Low-beam) (LH) bulb of a correct rated voltage (55 W) is installed.
Is the check result normal?
Go to Step 2.
Replace it with one of correct raged voltage.
 
STEP 2. Check of short to power supply circuit in HLOL line between the headlight assembly (LH) connector and ETACS-ECU connector.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
 
STEP 3. Check of short to ground circuit in ground line between the headlight assembly (LH) connector and body ground.
Is the check result normal?
Go to Step 4.
Repair the connector(s) or wiring harness.
 
STEP 4. Using scan tool (M.U.T.-IIISE), read the DTC again.
Check again if DTC B1E14 is set in the ETACS-ECU.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Erase the DTC.
(3) Turn on the headlight (Low-beam).
(4) On completion, check that the DTC is not set again.
Is the DTC set?
Go to Step 5.
The trouble can be an intermittent malfunction (GROUP 00 - How to use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 5. Using scan tool (M.U.T.-IIISE), read the DTC again.
Check again if DTC B1E14 is set in the ETACS-ECU.
(1) Erase the DTC.
(2) Disconnect the headlight assembly (LH) connector.
(3) Turn on the headlight (Low-beam).
(4) Check the DTC is set.
Is the DTC set?
Replace the ETACS-ECU.
Replace a headlight (LH).