DTC B242E: Open in IG Circuit [09/2019 - ]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2019 - ]

   Body Electrical > AFS > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  2

1. Turn the engine switch on (IG).
2. Check for DTCs.

   Refer to DTC CHECK / CLEAR [09/2019 - ]

   Body Electrical > AFS > Trouble Codes 

   OK

   DTC B242E is not output.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2019 - 08/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2020 - ] 

Result: 

NG 

See step  3

1. Disconnect the A95*1 or A16*2 headlight ECU sub-assembly LH connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *A	for TMMT Made
   *B	for TMC Made
   *a	Component without harness connected (Headlight ECU sub-assembly LH)

   1. *1: for TMMT Made
   2. *2: for TMC Made
2. Measure the voltage according to the value(s) in the chart below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A95-4 (IG) - Body ground*1	Engine switch off	Below 1 V
   A95-4 (IG) - Body ground*1	Engine switch on (IG)	11 to 14 V
   A16-4 (IG) - Body ground*2	Engine switch off	Below 1 V
   A16-4 (IG) - Body ground*2	Engine switch on (IG)	11 to 14 V

   1. *1: for TMMT Made
   2. *2: for TMC Made
3. Measure the resistance according to the value(s) in the chart below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A95-12 (GND) - Body ground*1	Always	Below 1 Ω
   A16-12 (GND) - Body ground*2	Always	Below 1 Ω

   1. *1: for TMMT Made
   2. *2: for TMC Made

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [09/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR