DTC    B2430    LED Headlight LH Circuit Malfunction

DTC    B2431    LED Headlight RH Circuit Malfunction

for Preparation Click here


DESCRIPTION

These DTCs are stored when the low beam headlights do not illuminate, or a malfunction is detected in the communication between the headlight assembly and main body ECU (multiplex network body ECU).

DTC No.
DTC Detection Condition
Trouble Area
B2430
LED headlight LH circuit malfunction
  1. Light control ECU LH
  2. Headlight unit LH
  3. No. 1 integration relay
  4. Harness or connector
  5. Main body ECU (multiplex network body ECU)
B2431
LED headlight RH circuit malfunction
  1. Light control ECU RH
  2. Headlight unit RH
  3. No. 1 integration relay
  4. Harness or connector
  5. Main body ECU (multiplex network body ECU)

WIRING DIAGRAM


E223763E02


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.CHECK FOR DTC

  1. Clear the DTCs (Click here).

  1. Check for DTCs (Click here).
    Result 
    Result
    		Proceed to
    Both DTC B2430 and B2431 are not output.
    		A
    Both DTC B2430 and B2431 are output.
    		B
    DTC B2430 or B2431 is output.
    		C



B
Go to step 2

C
Go to step 6
A

USE SIMULATION METHOD TO CHECK (Click here)  

2.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - AUXILIARY BATTERY AND BODY GROUND)

  1. Disconnect the 1G and 1H No. 1 integration relay connectors.

  1. Measure the voltage and resistance according to the value(s) in the table below.

    Standard Voltage:
    Tester Connector
    		Condition
    		Specified Condition
    1G-14 (IG1) - Body ground
    		Power switch on (IG)
    		11 to 14 V
    1H-7 (BATT) - Body ground
    		Power switch off
    		11 to 14 V

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1G-22 (GND1) - Body ground
    		Always
    		Below 1 Ω
    1H-3 (GND2) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK)

  1. Disconnect the 1G No. 1 integration relay connector.

  1. Disconnect the 2C instrument panel junction block assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1G-9 (HL4) - 2C-32
    		Always
    		Below 1 Ω
    1G-9 (HL4) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


  1. Remove the instrument panel junction block assembly.


    E173038E02

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2C-32 - A-15 (HRLY)
    		Always
    		Below 1 Ω
    2C-32 - Body ground
    		Always
    		10 kΩ or higher


    Text in Illustration 
    *a
    		Component without harness connected
    (Instrument Panel Junction Block Assembly)
    		*b
    		Component without harness connected
    (Instrument Panel Junction Block Assembly)



NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK


5.REPLACE NO. 1 INTEGRATION RELAY

  1. Replace the No. 1 integration relay with a new or a known good one (Click here).

  1. Check for DTCs (Click here).

    OK:
    DTC B2430 and B2431 are not output.



NG
REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)
OK

END 

6.INSPECT HEADLIGHT UNIT


    E190924E14

  1. Disconnect the A47 or A48 headlight unit connector.

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

    Standard Voltage:
    LH Side (B2430) 
    Tester Connection
    		Switch Condition
    		Specified Condition
    A47-3 (LO) - Body ground
    		Light control switch in head position
    		11 to 14 V
    RH Side (B2431) 
    Tester Connection
    		Switch Condition
    		Specified Condition
    A48-3 (LO) - Body ground
    		Light control switch in head position
    		11 to 14 V

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Headlight Unit LH)
    *b
    		Front view of wire harness connector
    (to Headlight Unit RH)



NG
Go to step 10
OK


7.INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    E190924E15

  1. Disconnect the A47 or A48 headlight unit connector.

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

    Standard Voltage:
    LH Side (B2430) 
    Tester Connection
    		Switch Condition
    		Specified Condition
    A47-2 (IN2) - Body ground
    		Light control switch in head position
    		4.5 to 5.5 V
    RH Side (B2431) 
    Tester Connection
    		Switch Condition
    		Specified Condition
    A48-2 (IN1) - Body ground
    		Light control switch in head position
    		4.5 to 5.5 V

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Headlight Unit LH)
    *b
    		Front view of wire harness connector
    (to Headlight Unit RH)



NG
Go to step 11
OK


8.CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT - BODY GROUND)

  1. Disconnect the A47 or A48 headlight unit connector.

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

    Standard Resistance:
    LH Side (B2430) 
    Tester Connection
    		Condition
    		Specified Condition
    A47-6 (E) - Body ground
    		Always
    		Below 1 Ω
    RH Side (B2431) 
    Tester Connection
    		Condition
    		Specified Condition
    A48-6 (E) - Body ground
    		Always
    		Below 1 Ω



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


9.REPLACE LIGHT CONTROL ECU

  1. Replace the headlight control ECU with a new or a known good one (Click here).

  1. Check for DTCs (Click here).

    OK:
    DTC B2430 or B2431 is not output.



NG
REPLACE HEADLIGHT UNIT (Click here)
OK

END 

10.CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT - NO. 1 INTEGRATION RELAY)

  1. Disconnect the 1G No. 1 integration relay connector.

  1. Disconnect the A47 or A48 headlight unit connector.

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

    Standard Resistance:
    LH Side (B2430) 
    Tester Connection
    		Condition
    		Specified Condition
    1G-2 (HLPL) - A47-3 (LO)
    		Always
    		Below 1 Ω
    1G-2 (HLPL) - Body ground
    		Always
    		10 kΩ or higher
    RH Side (B2431) 
    Tester Connection
    		Condition
    		Specified Condition
    1G-1 (HLPR) - A48-3 (LO)
    		Always
    		Below 1 Ω
    1G-1 (HLPR) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE NO. 1 INTEGRATION RELAY (Click here)  

11.CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT UNIT)

  1. Disconnect the H17 main body ECU (multiplex network body ECU) connector.

  1. Disconnect the A47 or A48 headlight unit connector.

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

    Standard Resistance:
    LH Side (B2430) 
    Tester Connection
    		Condition
    		Specified Condition
    H17-21 (LLEW) - A47-2 (IN2)
    		Always
    		Below 1 Ω
    H17-21 (LLEW) - Body ground
    		Always
    		10 kΩ or higher
    RH Side (B2431) 
    Tester Connection
    		Condition
    		Specified Condition
    H17-8 (RLEW) - A48-2 (IN1)
    		Always
    		Below 1 Ω
    H17-8 (RLEW) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (Click here)