Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: IG Circuit Short to Ground or Open (B242E14)

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Exterior / Lighting (ext) / Lighting System (w/ Afs) / IG Circuit Short to Ground or Open (B242E14)

DESCRIPTION

The headlight ECU sub-assembly operates using the power source voltage input from the IGR terminal and ECUB terminal.

The IG terminal power source voltage is supplied by turning the IGR-NO.1 relay to ON.

The headlight ECU sub-assembly receives ignition switch ON signals from the main body ECU (multiplex network body ECU) via CAN communication, compares the ignition switch ON signal and the power source voltage supply condition of the IGR terminal and monitors the result.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B242E14

IG Circuit Short to Ground or Open

 Detection condition:
  • The ignition switch is ON
Malfunction status:
  • When the IGR terminal power source voltage is 0 V (ignition switch off), IG ON signals from the main body ECU (multiplex network body ECU) via CAN communication are continuously received
Malfunction duration:
  • 10 seconds or more
  • Headlight ECU sub-assembly LH
  • Harness or connector

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B242E14

IG Circuit Short to Ground or Open

 Detection condition:
  • The ignition switch is ON
Malfunction status:
  • When the IGR terminal power source voltage is 0 V (ignition switch off), IG ON signals from the main body ECU (multiplex network body ECU) via CAN communication are continuously received
Malfunction duration:
  • 10 seconds or more
  • Headlight ECU sub-assembly RH
  • Harness or connector

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.

    Click here

PROCEDURE

1.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Headlight Control > Clear DTCs Body Electrical > Headlight Control (Sub) > Clear DTCs
NEXT

2.

CHECK FOR DTC

(a) Turn the ignition switch to ON.

(b) Wait 10 seconds or more.

(c) Check for DTCs.

Body Electrical > Headlight Control > Trouble Codes Body Electrical > Headlight Control (Sub) > Trouble Codes

OK:

DTC B242E14 is not output.

Result

Proceed to

OK

A

NG (DTC output from headlight ECU sub-assembly LH)

B

NG (DTC output from headlight ECU sub-assembly RH)

C
A

USE SIMULATION METHOD TO CHECK

C

GO TO STEP 4

B

3.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - BATTERY AND BODY GROUND)

*a

Front view of wire harness connector

(to Headlight ECU Sub-assembly LH)

(a) Disconnect the headlight ECU sub-assembly LH connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A159-6 (IGR) - Body ground

Ignition switch ON

11 to 14 V

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A159-12 (GND) - Body ground

Always

Below 1 Ω
OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - BATTERY AND BODY GROUND)

*a

Front view of wire harness connector

(to Headlight ECU Sub-assembly RH)

(a) Disconnect the headlight ECU sub-assembly RH connector.

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A160-6 (IGR) - Body ground

Ignition switch ON

11 to 14 V

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A160-12 (GND) - Body ground

Always

Below 1 Ω
OK

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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