DESCRIPTION
The illumination of the low beam headlights is controlled by the main body ECU
(multiplex network body ECU). When the headlights are turned on, the main body ECU
(multiplex network body ECU) receives a signal from the headlight assembly and detects
the illumination condition of the low beam headlights.
|
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
|
B2430
|
LED Headlight LH Circuit Malfunction
|
LED headlight LH circuit malfunction
|
- Headlight assembly LH
- Main body ECU (multiplex network body ECU)
- Driver side junction block assembly
- Harness or connector
|
|
B2431
|
LED Headlight RH Circuit Malfunction
|
LED headlight RH circuit malfunction
|
- Headlight assembly RH
- Main body ECU (multiplex network body ECU)
- Driver side junction block assembly
- Harness or connector
|
HINT:
DTC B2430 and B2431 are not output if 20 seconds have not elapsed since the ignition
switch was turned on.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following
procedure.
PROCEDURE
(a) Clear the DTCs.
Click here 
(b) Check for DTCs.
Click here
OK:
DTC B2430 and B2431 are not output.
|
Result
|
Proceed to
|
|
OK
|
A
|
|
NG (DTC B2430 and B2431 are output)
|
B
|
|
NG (DTC B2430 is output)
|
C
|
|
NG (DTC B2431 is output)
|
D
|
| A |
 |
USE SIMULATION METHOD TO CHECK
|
| C |
|
GO TO STEP 6
|
| D |
|
GO TO STEP 9
|
| B |
|
|
|
2.
|
INSPECT HEADLIGHT RELAY (H-LP LO)
|
(a) Remove the headlight relay (H-LP LO) from the engine room relay block and
junction block.
(b) Inspect the headlight relay (H-LP LO).
Click here
| NG |
|
REPLACE HEADLIGHT RELAY (H-LP LO)
|
| OK |
|
|
|
|
3.
|
CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP LO] - BATTERY)
|
|
(a) Remove the headlight relay (H-LP LO) from the engine room relay block
and junction block.
|
 |
|
*a
|
Front view of wire harness connector
(to Headlight Relay [H-LP LO])
|
|
|
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection
|
Condition
|
Specified Condition
|
|
Headlight relay (H-LP LO) terminal 1 - Body ground
|
Always
|
11 to 14 V
|
|
Headlight relay (H-LP LO) terminal 3 - Body ground
|
Always
|
11 to 14 V
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
| OK |
|
|
|
|
4.
|
CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP LO] - DRIVER SIDE
JUNCTION BLOCK ASSEMBLY AND HEADLIGHT ASSEMBLY)
|
(a) Remove the headlight relay (H-LP LO) from the engine room relay block and
junction block.
(b) Disconnect the 3H driver side junction block assembly connector.
(c) Disconnect the A59 headlight assembly LH connector.
(d) Disconnect the A58 headlight assembly RH connector.
(e) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection
|
Condition
|
Specified Condition
|
|
Headlight relay (H-LP LO) terminal 2 - 3H-31
|
Always
|
Below 1 Ω
|
|
Headlight relay (H-LP LO) terminal 5 - A59-2 (LO)
|
Always
|
Below 1 Ω
|
|
Headlight relay (H-LP LO) terminal 2 or 3H-31 - Body ground
|
Always
|
10 kΩ or higher
|
|
Headlight relay (H-LP LO) terminal 5 or A59-2 (LO) - Body ground
|
Always
|
10 kΩ or higher
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
| OK |
|
|
|
|
5.
|
CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY
|
|
(a) Remove the driver side junction block assembly.
Click here
|
|
|
*a
|
Component without harness connected
(Driver Side Junction Block Assembly)
|
|
|
(b) Remove the main body ECU (multiplex network body ECU) from the driver side
junction block assembly.
Click here
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection
|
Condition
|
Specified Condition
|
|
3H-31 - A-15 (HRLY)
|
Always
|
Below 1 Ω
|
| OK |
|
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
| NG |
|
REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY
|
|
6.
|
CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP LO] - HEADLIGHT ASSEMBLY
LH)
|
(a) Remove the headlight relay (H-LP LO) from the engine room relay block and
junction block.
(b) Disconnect the A59 headlight assembly LH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection
|
Condition
|
Specified Condition
|
|
Headlight relay (H-LP LO) terminal 5 - A59-2 (LO)
|
Always
|
Below 1 Ω
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
| OK |
|
|
|
|
7.
|
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LH - MAIN BODY ECU [MULTIPLEX
NETWORK BODY ECU] AND BODY GROUND)
|
(a) Disconnect the A59 headlight assembly LH connector.
(b) Disconnect the J165 main body ECU (multiplex network body ECU) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection
|
Condition
|
Specified Condition
|
|
A59-3 (S) - J165-16 (LLEW)
|
Always
|
Below 1 Ω
|
|
A59-4 (E) - Body ground
|
Always
|
Below 1 Ω
|
|
A59-3 (S) or J165-16 (LLEW) - Body ground
|
Always
|
10 kΩ or higher
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
| OK |
|
|
|
|
8.
|
CHECK HEADLIGHT ASSEMBLY LH
|
(a) Temporarily replace the headlight assembly LH with a new or normally functioning
one.
Click here
(b) Clear the DTCs.
Click here
(c) Check for DTCs.
Click here
OK:
DTC B2430 is not output.
| OK |
|
END (HEADLIGHT ASSEMBLY LH WAS DEFECTIVE)
|
| NG |
|
MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
|
9.
|
CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP LO] - HEADLIGHT ASSEMBLY
RH)
|
(a) Remove the headlight relay (H-LP LO) from the engine room relay block and
junction block.
(b) Disconnect the A58 headlight assembly RH connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection
|
Condition
|
Specified Condition
|
|
Headlight relay (H-LP LO) terminal 5 - A58-2 (LO)
|
Always
|
Below 1 Ω
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
| OK |
|
|
|
|
10.
|
CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY RH - MAIN BODY ECU [MULTIPLEX
NETWORK BODY ECU] AND BODY GROUND)
|
(a) Disconnect the A58 headlight assembly RH connector.
(b) Disconnect the J165 main body ECU (multiplex network body ECU) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection
|
Condition
|
Specified Condition
|
|
A58-3 (S) - J165-3 (RLEW)
|
Always
|
Below 1 Ω
|
|
A58-4 (E) - Body ground
|
Always
|
Below 1 Ω
|
|
A58-3 (S) or J165-3 (RLEW) - Body ground
|
Always
|
10 kΩ or higher
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
| OK |
|
|
|
|
11.
|
CHECK HEADLIGHT ASSEMBLY RH
|
(a) Temporarily replace the headlight assembly RH with a new or normally functioning
one.
Click here
(b) Clear the DTCs.
Click here
(c) Check for DTCs.
Click here
OK:
DTC B2431 is not output.
| OK |
|
END (HEADLIGHT ASSEMBLY RH WAS DEFECTIVE)
|
| NG |
|
MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
|
| 
