Last Modified: 05-13-2024 |
6.11:8.1.0 |
Doc ID: RM100000001I0WE |
Model Year Start: 2020 |
Model: GR Corolla |
Prod Date Range: [03/2019 - 09/2022] |
Title: LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model without AFS): B2430,B2431; LED Headlight LH; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [03/2019 - 09/2022] |
DTC
|
B2430
|
LED Headlight LH
|
DTC
|
B2431
|
LED Headlight RH
|
DESCRIPTION
These DTCs are stored when the low beam headlights do not illuminate, or a communication malfunction is detected between the light control ECU and main body ECU (multiplex network body ECU).
HINT:
DTC B2430 or DTC B2431 may also be stored if a headlight cooling fan is malfunctioning. In this case, the light control ECU will dim or turn off the malfunctioning low beam headlight.
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
DTC Output from
|
B2430
|
LED Headlight LH
|
Detection condition:
-
All of the following conditions are met:
-
Engine running
-
Low beam headlights on
Malfunction Status:
-
Any of the following conditions is met:
-
Light control ECU malfunction
-
Headlight assembly LH malfunction
-
Light control ECU power source and signal malfunction
|
-
Headlight assembly LH
-
No. 1 integration relay
-
Instrument panel junction block assembly
-
Main body ECU (multiplex network body ECU)
-
Harness or connector
|
Main Body
|
B2431
|
LED Headlight RH
|
Detection condition:
-
All of the following conditions are met:
-
Engine running
-
Low beam headlights on
Malfunction Status:
-
Any of the following conditions is met:
-
Light control ECU malfunction
-
Headlight assembly RH malfunction
-
Light control ECU power source and signal malfunction
|
-
Headlight assembly RH
-
No. 1 integration relay
-
Main body ECU (multiplex network body ECU)
-
Harness or connector
|
Main Body
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
PROCEDURE
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Main Body / Trouble Codes.
(e) Clear the DTCs.
Body Electrical > Main Body > Clear DTCs
NEXT
|
|
|
(a) Connect the Techstream to the DLC3.
(b) Start the engine.
(c) Operate the light control switch to turn on the low beam headlights and wait 10 seconds or more.
(d) Turn the Techstream on.
(e) Enter the following menus: Body Electrical / Main Body / Trouble Codes.
(f) Check for DTCs.
Body Electrical > Main Body > Trouble Codes
OK:
DTC B2430 and B2431 are not output.
Result
|
Proceed to
|
OK
|
A
|
NG (DTC B2430 is output)
|
B
|
NG (DTC B2431 is output)
|
C
|
B
|
|
|
3.
|
INSPECT HEADLIGHT ASSEMBLY LH (LO TERMINAL VOLTAGE)
|
*a
|
Front view of wire harness connector
(to Headlight Assembly LH)
|
(a) Disconnect the A81 headlight assembly LH connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A81-3 (LO) - Body ground
|
Light control switch in head position
|
11 to 14 V
|
OK
|
|
|
4.
|
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - BODY GROUND)
|
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
A81-4 (E) - Body ground
|
Always
|
Below 1 Ω
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
5.
|
INSPECT HEADLIGHT ASSEMBLY LH (S TERMINAL VOLTAGE)
|
*a
|
Front view of wire harness connector
(to Headlight Assembly LH)
|
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A81-5 (S) - Body ground
|
Ignition switch ON
|
11 to 14 V
|
Result
|
Proceed to
|
OK (for TMC Made)
|
A
|
OK (for TMMMS Made)
|
B
|
NG
|
C
|
C
|
|
|
6.
|
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))
|
(a) Disconnect the I86 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
|
A81-5 (S) - I86-14 (LLEW)
|
Always
|
Below 1 Ω
|
A81-5 (S) or I86-14 (LLEW) - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
7.
|
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT ASSEMBLY LH)
|
(a) Disconnect the 1B No. 1 integration relay connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
1B-1 - A81-3 (LO)
|
Always
|
Below 1 Ω
|
1B-1 or A81-3 (LO) - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
8.
|
INSPECT NO. 1 INTEGRATION RELAY
|
(a) Remove the No. 1 integration relay.
Click here
(b) Inspect the No. 1 integration relay.
Click here
OK
|
|
|
9.
|
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
|
|
|
10.
|
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
|
|
|
11.
|
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
|
12.
|
INSPECT HEADLIGHT ASSEMBLY RH (LO TERMINAL VOLTAGE)
|
*a
|
Front view of wire harness connector
(to Headlight Assembly RH)
|
(a) Disconnect the A80 headlight assembly RH connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A80-3 (LO) - Body ground
|
Light control switch in head position
|
11 to 14 V
|
OK
|
|
|
13.
|
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - BODY GROUND)
|
(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
A80-4 (E) - Body ground
|
Always
|
Below 1 Ω
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
14.
|
INSPECT HEADLIGHT ASSEMBLY RH (S TERMINAL VOLTAGE)
|
*a
|
Front view of wire harness connector
(to Headlight Assembly RH)
|
(a) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
A80-5 (S) - Body ground
|
Ignition switch ON
|
11 to 14 V
|
Result
|
Proceed to
|
OK (for TMC Made)
|
A
|
OK (for TMMMS Made)
|
B
|
NG
|
C
|
C
|
|
|
15.
|
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))
|
(a) Disconnect the I86 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
|
A80-5 (S) - I86-15 (RLEW)
|
Always
|
Below 1 Ω
|
A80-5 (S) or I86-15 (RLEW) - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
16.
|
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT ASSEMBLY RH)
|
(a) Disconnect the 1A No. 1 integration relay connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
1A-12 - A80-3 (LO)
|
Always
|
Below 1 Ω
|
1A-12 or A80-3 (LO) - Body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
OK
|
|
|
17.
|
INSPECT NO. 1 INTEGRATION RELAY
|
(a) Remove the No. 1 integration relay.
Click here
(b) Inspect the No. 1 integration relay.
Click here
OK
|
|
|
18.
|
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
|
|
|
19.
|
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
|
|