Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001AULM |
Model Year Start: 2019 |
Model: GR Corolla |
Prod Date Range: [06/2018 - 09/2022] |
Title: LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): B242F; Open in B Power Line; 2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022] |
DTC
|
B242F
|
Open in B Power Line
|
DESCRIPTION
The headlight ECU sub-assembly operates using the power source voltage input from the IG terminal and ECUB terminal.
The power source voltage of the ECUB terminal is supplied when the main body ECU (multiplex network body ECU) turns the ECUB power supply relay (H-LP LH relay and H-LP RH relay) to ON.
The headlight ECU sub-assembly compares the power source voltage supply condition of the IG terminal and ECUB terminal and monitors the result.
AFS
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
DTC Output from
|
B242F
|
Open in B Power Line
|
Detection condition:
-
The engine switch is on (IG).
Malfunction status:
-
No power source voltage supplied to ECUB terminal while power source voltage being supplied to IG terminal
|
-
Headlight ECU sub-assembly LH
-
Headlight unit assembly LH
-
Harness or connector
-
No. 1 integration relay
-
Instrument panel junction block assembly
-
Main body ECU (multiplex network body ECU)
|
AFS
|
AFS (Sub)
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
DTC Output from
|
B242F
|
Open in B Power Line
|
Detection condition:
-
The engine switch is on (IG).
Malfunction status:
-
No power source voltage supplied to ECUB terminal while power source voltage being supplied to IG terminal
|
-
Headlight ECU sub-assembly RH
-
Headlight unit assembly RH
-
Harness or connector
-
No. 1 integration relay
-
Main body ECU (multiplex network body ECU)
|
AFS (Sub)
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
PROCEDURE
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / AFS or AFS (Sub) / Trouble Codes.
(e) Clear the DTCs.
Body Electrical > AFS > Clear DTCs
Body Electrical > AFS (Sub) > Clear DTCs
NEXT
|
|
|
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Wait 10 seconds or more.
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / AFS or AFS (Sub) / Trouble Codes.
(f) Check for DTCs.
Body Electrical > AFS > Trouble Codes
Body Electrical > AFS (Sub) > Trouble Codes
OK:
DTC B242F 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
|
B
|
|
|
3.
|
INSPECT HEADLIGHT UNIT ASSEMBLY LH (HEADLIGHT CORD)
|
*1
|
Headlight Unit Assembly LH (Headlight Cord)
|
-
|
-
|
*a
|
Component without harness connected
(to Headlight ECU Sub-assembly LH)
|
*b
|
Component without harness connected
(to Wire Harness)
|
(a) Remove the headlight unit assembly LH.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
A23-1 - A-13 (ECUB)
|
Always
|
Below 1 Ω
|
A23-4 - A-12 (GND)
|
Always
|
Below 1 Ω
|
OK
|
|
|
4.
|
INSPECT HEADLIGHT ECU SUB-ASSEMBLY LH (ECUB TERMINAL VOLTAGE)
|
*a
|
Front view of wire harness connector
(to Headlight ECU Sub-assembly LH)
|
(a) Disconnect the A headlight ECU sub-assembly LH connector.
(b) Connect the A23 headlight unit assembly LH connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A-13 (ECUB) - Body ground
|
Engine switch on (IG)
|
9.5 to 14 V
|
OK
|
|
|
5.
|
CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - BODY GROUND)
|
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
A-12 (GND) - Body ground
|
Always
|
Below 1 Ω
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
6.
|
INSPECT NO. 1 INTEGRATION RELAY
|
(a) Remove the No. 1 integration relay.
Click here
(b) Inspect the No. 1 integration relay.
Click here
OK
|
|
|
7.
|
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT UNIT ASSEMBLY LH (HEADLIGHT CORD))
|
(a) Disconnect the A23 headlight unit assembly LH connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
1B-1 - A23-1
|
Always
|
Below 1 Ω
|
1B-1 or A23-1 - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
8.
|
CHECK HARNESS AND CONNECTOR (POWER SOURCE - NO. 1 INTEGRATION RELAY)
|
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
1A-5 - Body ground
|
Always
|
11 to 14 V
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
9.
|
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
|
(a) Disconnect the 4B instrument panel junction block assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
1B-2 - 4B-31
|
Always
|
Below 1 Ω
|
1B-2 or 4B-31 - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
10.
|
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
*a
|
Component without harness connected
(Instrument Panel Junction Block Assembly)
|
-
|
-
|
(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
4B-31 - MB-15 (HRLY)
|
Always
|
Below 1 Ω
|
11.
|
INSPECT HEADLIGHT UNIT ASSEMBLY RH (HEADLIGHT CORD)
|
*1
|
Headlight Unit Assembly RH (Headlight Cord)
|
-
|
-
|
*a
|
Component without harness connected
(to Headlight ECU Sub-assembly RH)
|
*b
|
Component without harness connected
(to Wire Harness)
|
(a) Remove the headlight unit assembly RH.
Click here
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
A22-1 - A-13 (ECUB)
|
Always
|
Below 1 Ω
|
A22-4 - A-12 (GND)
|
Always
|
Below 1 Ω
|
OK
|
|
|
12.
|
INSPECT HEADLIGHT ECU SUB-ASSEMBLY RH (ECUB TERMINAL VOLTAGE)
|
*a
|
Front view of wire harness connector
(to Headlight ECU Sub-assembly RH)
|
(a) Disconnect the A headlight ECU sub-assembly RH connector.
(b) Connect the A22 headlight unit assembly RH connector.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A-13 (ECUB) - Body ground
|
Engine switch on (IG)
|
9.5 to 14 V
|
OK
|
|
|
13.
|
CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - BODY GROUND)
|
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
A-12 (GND) - Body ground
|
Always
|
Below 1 Ω
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
14.
|
INSPECT NO. 1 INTEGRATION RELAY
|
(a) Remove the No. 1 integration relay.
Click here
(b) Inspect the No. 1 integration relay.
Click here
OK
|
|
|
15.
|
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT UNIT ASSEMBLY RH (HEADLIGHT CORD))
|
(a) Disconnect the A22 headlight unit assembly RH connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
1A-12 - A22-1
|
Always
|
Below 1 Ω
|
1A-12 or A22-1 - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
16.
|
CHECK HARNESS AND CONNECTOR (POWER SOURCE - NO. 1 INTEGRATION RELAY)
|
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
1B-8 - Body ground
|
Always
|
11 to 14 V
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
17.
|
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))
|
(a) Disconnect the I85 main body ECU (multiplex network body ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
1A-11 - I85-12 (HRY2)
|
Always
|
Below 1 Ω
|
1A-11 or I85-12 (HRY2) - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|