| DTC Code | DTC Name |
|---|---|
| B2424 | Lost Communication with Headlight Leveling ECU LH |
| B2425 | Lost Communication with Headlight Leveling ECU RH |
| B2440 | Lost Communication with AHS EDU LH Module |
| B2441 | Lost Communication with AHS EDU RH Module |
DESCRIPTION
The headlight ECU sub-assembly sends auto leveling control signals to the headlight leveling motor via LIN communication.
The headlight leveling motor operates according to the power supply and control signals from the headlight ECU sub-assembly and sends its operation status to the headlight ECU sub-assembly via LIN communication.
The headlight ECU sub-assembly sends AHS control signals to the light control LED ECU via LIN communication.
The light control LED ECU receives power and control signals from the headlight ECU sub-assembly, controls the additional LEDs and additional fans, and sends its operation status to the headlight ECU sub-assembly via LIN communication.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | DTC Output from | Note |
|---|---|---|---|---|---|
| B2424 | Lost Communication with Headlight Leveling ECU LH |
|
|
Headlight ECU sub-assembly LH | - |
| B2425 | Lost Communication with Headlight Leveling ECU RH |
|
|
Headlight ECU sub-assembly LH | - |
| B2440 | Lost Communication with AHS EDU LH Module |
|
|
Headlight ECU sub-assembly LH | w/ Adaptive High Beam System |
| B2441 | Lost Communication with AHS EDU RH Module |
|
|
Headlight ECU sub-assembly LH | w/ Adaptive High Beam System |
| Ouput DTC | Suspected Area (Malfunction Status) | |||
|---|---|---|---|---|
| B2424 | B2425 | B2440 | B2441 | |
| ○ | ○ | ○ | ○ | LIN circuit (short) |
| Headlight ECU sub-assembly LH (Internal malfunction) | ||||
| ○ | - | ○ | - | Headlight ECU sub-assembly LH (Internal malfunction) |
| - | ○ | - | ○ | Headlight ECU sub-assembly RH (Internal malfunction) |
| ○ | - | - | - | Headlight leveling motor LH power supply system abnormal |
| Headlight leveling motor LH (Internal malfunction) | ||||
| Harness open circuit (Headlight ECU sub-assembly LH to headlight leveling motor LH) | ||||
| Headlight ECU sub-assembly LH (Internal malfunction) | ||||
| - | ○ | - | - | Headlight leveling motor RH power supply abnormal |
| Headlight leveling motor RH (Internal malfunction) | ||||
| Harness open circuit (Headlight ECU sub-assembly RH to headlight leveling motor RH) | ||||
| Headlight ECU sub-assembly RH (Internal malfunction) | ||||
| - | - | ○ | - | Light control LED ECU LH power supply system abnormal |
| Light control LED ECU LH (Internal malfunction) | ||||
| Harness open circuit (Headlight ECU sub-assembly LH to light control LED ECU LH) | ||||
| Headlight ECU sub-assembly LH (Internal malfunction) | ||||
| - | - | - | ○ | Light control LED ECU RH power supply system abnormal |
| Light control LED ECU RH (Internal malfunction) | ||||
| Harness open circuit (Headlight ECU sub-assembly RH to light control LED ECU RH) | ||||
| Headlight ECU sub-assembly RH (Internal malfunction) | ||||
| Ouput DTC | Suspected Area (Malfunction Status) | |
|---|---|---|
| B2424 | B2425 | |
| ○ | ○ | LIN circuit (short) |
| Headlight ECU sub-assembly LH (Internal malfunction) | ||
| ○ | - | Headlight leveling motor LH power supply system abnormal |
| Headlight leveling motor LH (Internal malfunction) | ||
| Harness open circuit (Headlight ECU sub-assembly LH to headlight leveling motor LH) | ||
| Headlight ECU sub-assembly LH (Internal malfunction) | ||
| - | ○ | Headlight leveling motor RH power supply abnormal |
| Headlight leveling motor RH (Internal malfunction) | ||
| Harness open circuit (Headlight ECU sub-assembly RH to headlight leveling motor RH) | ||
| Headlight ECU sub-assembly RH (Internal malfunction) | ||
| Headlight ECU sub-assembly LH (Internal malfunction) | ||
CAUTION / NOTICE / HINT
If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.
PROCEDURE
CONFIRM MODEL
Choose the model to be inspected.
| Result | ||||||
|---|---|---|---|---|---|---|
|
CHECK FOR DTC
Clear the DTCs.
Turn the power switch on (IG) and wait for at least 10 seconds or more.
Check for DTCs.
| Result | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
USE SIMULATION METHOD TO CHECKClick here
REPLACE HEADLIGHT ECU SUB-ASSEMBLY LHClick here
CHECK HEADLIGHT ASSEMBLY RH
Disconnect the A32 headlight ECU sub-assembly RH connector.
Clear the DTCs.
Turn the power switch on (IG) and wait for at least 10 seconds or more.
Check for DTCs.
| Result | ||||||
|---|---|---|---|---|---|---|
|
CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - HEADLIGHT ECU SUB-ASSEMBLY RH)
Disconnect the A31 headlight ECU sub-assembly LH connector.
Disconnect the A32 headlight ECU sub-assembly RH connector.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
CHECK HEADLIGHT ECU SUB-ASSEMBLY LH
Remove the headlight ECU sub-assembly LH.
Reconnect the A31 headlight ECU sub-assembly LH connector.
Clear the DTCs.
Turn the power switch on (IG) and wait for at least 10 seconds or more.
Check for DTCs.
| Result | ||||||
|---|---|---|---|---|---|---|
|
REPLACE HEADLIGHT ECU SUB-ASSEMBLY LHClick here
CHECK HEADLIGHT LEVELING MOTOR LH
Disconnect the headlight leveling motor LH connector.
Reconnect the except headlight leveling motor LH connector.
Clear the DTCs.
Turn the power switch on (IG) and wait for at least 10 seconds or more.
Check for DTCs.
| Result | ||||||
|---|---|---|---|---|---|---|
|
REPLACE HEADLIGHT LEVELING MOTOR LHClick here
CHECK LIGHT CONTROL LED ECU LH
Disconnect the light control LED ECU LH connector.
Reconnect the except light control LED ECU LH connector.
Clear the DTCs.
Turn the power switch on (IG) and wait for at least 10 seconds or more.
Check for DTCs.
| Result | ||||||
|---|---|---|---|---|---|---|
|
REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS)Click here
REPLACE LIGHT CONTROL LED ECU LHClick here
CHECK HEADLIGHT ECU SUB-ASSEMBLY RH
Remove the headlight ECU sub-assembly RH.
Reconnect the A32 headlight ECU sub-assembly RH connector.
Clear the DTCs.
Turn the power switch on (IG) and wait for at least 10 seconds or more.
Check for DTCs.
| Result | ||||||
|---|---|---|---|---|---|---|
|
REPLACE HEADLIGHT ECU SUB-ASSEMBLY RHClick here
CHECK HEADLIGHT LEVELING MOTOR RH
Disconnect the headlight leveling motor RH connector.
Reconnect the except headlight leveling motor RH connector.
Clear the DTCs.
Turn the power switch on (IG) and wait for at least 10 seconds or more.
Check for DTCs.
| Result | ||||||
|---|---|---|---|---|---|---|
|
REPLACE HEADLIGHT LEVELING MOTOR RHClick here
CHECK LIGHT CONTROL LED ECU RH
Disconnect the light control LED ECU RH connector.
Reconnect the except light control LED ECU RH connector.
Clear the DTCs.
Turn the power switch on (IG) and wait for at least 10 seconds or more.
Check for DTCs.
| Result | ||||||
|---|---|---|---|---|---|---|
|
REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS)Click here
REPLACE LIGHT CONTROL LED ECU RHClick here
CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - HEADLIGHT ECU SUB-ASSEMBLY RH)
Disconnect the A31 headlight ECU sub-assembly LH connector.
Disconnect the A32 headlight ECU sub-assembly RH connector.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
CHECK HEADLIGHT ECU SUB-ASSEMBLY RH
| *a | Component with harness connected (Headlight ECU Sub-assembly RH) |
| *b | Front view of wire harness connector (to Headlight ECU Sub-assembly LH) |
Remove the headlight ECU sub-assembly RH as a unit with the connectors still connected.
Disconnect the A31 headlight ECU sub-assembly LH connector.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPLACE HEADLIGHT ECU SUB-ASSEMBLY LHClick here
REPLACE HEADLIGHT ECU SUB-ASSEMBLY RHClick here
CHECK HEADLIGHT UNIT ASSEMBLY LH
| *a | Component without harness connected (Headlight ECU Sub-assembly LH) |
*b | Component without harness connected (Headlight Leveling Motor LH) |
Remove the headlight unit assembly LH.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS)Click here
CHECK HEADLIGHT ECU SUB-ASSEMBLY LH
| *a | Component with harness connected (Headlight Leveling Motor LH) |
Disconnect the headlight leveling motor LH connector.
Reconnect the except headlight leveling motor LH connector.
Measure the voltage according to the value(s) in the table below.
| Standard Voltage | ||||||||
|---|---|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPLACE HEADLIGHT ECU SUB-ASSEMBLY LHClick here
CHECK HEADLIGHT ECU SUB-ASSEMBLY LH
| *a | Component with harness connected (Headlight ECU Sub-assembly LH) |
| *b | Front view of wire harness connector (to Headlight ECU Sub-assembly RH) |
Remove the headlight ECU sub-assembly LH as a unit with the connectors still connected.
Disconnect the A32 headlight ECU sub-assembly RH connector.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPLACE HEADLIGHT LEVELING MOTOR LHClick here
REPLACE HEADLIGHT ECU SUB-ASSEMBLY LHClick here
CHECK HEADLIGHT UNIT ASSEMBLY RH
| *a | Component without harness connected (Headlight ECU Sub-assembly RH) |
*b | Component without harness connected (Headlight Leveling Motor RH) |
Remove the headlight unit assembly RH.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS)Click here
CHECK HEADLIGHT ECU SUB-ASSEMBLY RH
| *a | Component with harness connected (Headlight Leveling Motor RH) |
Disconnect the headlight leveling motor RH connector.
Reconnect the except headlight leveling motor RH connector.
Measure the voltage according to the value(s) in the table below.
| Standard Voltage | ||||||||
|---|---|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPLACE HEADLIGHT ECU SUB-ASSEMBLY RHClick here
CHECK HEADLIGHT ECU SUB-ASSEMBLY RH
| *a | Component with harness connected (Headlight ECU Sub-assembly RH) |
| *b | Front view of wire harness connector (to Headlight ECU Sub-assembly LH) |
Remove the headlight ECU sub-assembly RH as a unit with the connectors still connected.
Disconnect the A31 headlight ECU sub-assembly LH connector.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPLACE HEADLIGHT LEVELING MOTOR RHClick here
REPLACE HEADLIGHT ECU SUB-ASSEMBLY RHClick here
CHECK HEADLIGHT UNIT ASSEMBLY LH
| *a | Component without harness connected (Headlight ECU Sub-assembly LH) |
*b | Component without harness connected (Light Control LED ECU LH) |
Remove the light control LED ECU LH.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS)Click here
CHECK HEADLIGHT ECU SUB-ASSEMBLY LH
| *a | Component with harness connected (Light Control LED ECU LH) |
Disconnect the light control LED ECU LH connector.
Reconnect the except light control LED ECU LH connector.
Measure the voltage according to the value(s) in the table below.
| Standard Voltage | ||||||||
|---|---|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPLACE HEADLIGHT ECU SUB-ASSEMBLY LHClick here
CHECK HEADLIGHT ECU SUB-ASSEMBLY LH
| *a | Component with harness connected (Headlight ECU Sub-assembly LH) |
| *b | Front view of wire harness connector (to Headlight ECU Sub-assembly RH) |
Remove the headlight ECU sub-assembly LH as a unit with the connectors still connected.
Disconnect the A32 headlight ECU sub-assembly RH connector.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPLACE LIGHT CONTROL LED ECU LHClick here
REPLACE HEADLIGHT ECU SUB-ASSEMBLY LHClick here
CHECK HEADLIGHT UNIT ASSEMBLY RH
| *a | Component without harness connected (Headlight ECU Sub-assembly RH) |
*b | Component without harness connected (Light Control LED ECU RH) |
Remove the light control LED ECU RH.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS)Click here
CHECK HEADLIGHT ECU SUB-ASSEMBLY RH
| *a | Component with harness connected (Light Control LED ECU RH) |
Disconnect the light control LED ECU RH connector.
Reconnect the except light control LED ECU RH connector.
Measure the voltage according to the value(s) in the table below.
| Standard Voltage | ||||||||
|---|---|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPLACE HEADLIGHT ECU SUB-ASSEMBLY RHClick here
CHECK HEADLIGHT ECU SUB-ASSEMBLY RH
| *a | Component with harness connected (Headlight ECU Sub-assembly RH) |
| *b | Front view of wire harness connector (to Headlight ECU Sub-assembly LH) |
Remove the headlight ECU sub-assembly RH as a unit with the connectors still connected.
Disconnect the A31 headlight ECU sub-assembly LH connector.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPLACE LIGHT CONTROL LED ECU RHClick here
REPLACE HEADLIGHT ECU SUB-ASSEMBLY RHClick here
CHECK FOR DTC
Clear the DTCs.
Turn the power switch on (IG) and wait for at least 10 seconds or more.
Check for DTCs.
| Result | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|
USE SIMULATION METHOD TO CHECKClick here
GO TO STEP 13
GO TO STEP 16
CHECK HEADLIGHT ASSEMBLY RH
Disconnect the A32 headlight ECU sub-assembly RH connector.
Clear the DTCs.
Turn the power switch on (IG) and wait for at least 10 seconds or more.
Check for DTCs.
| Result | ||||||
|---|---|---|---|---|---|---|
|
CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - HEADLIGHT ECU SUB-ASSEMBLY RH)
Disconnect the A31 headlight ECU sub-assembly LH connector.
Disconnect the A32 headlight ECU sub-assembly RH connector.
Measure the resistance according to the value(s) in the table below.
| Standard Resistance | ||||||
|---|---|---|---|---|---|---|
|
| Result | |||
|---|---|---|---|
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
CHECK HEADLIGHT ECU SUB-ASSEMBLY LH
Remove the headlight ECU sub-assembly LH.
Reconnect the A31 headlight ECU sub-assembly LH connector.
Clear the DTCs.
Turn the power switch on (IG) and wait for at least 10 seconds or more.
Check for DTCs.
| Result | ||||||
|---|---|---|---|---|---|---|
|
REPLACE HEADLIGHT ECU SUB-ASSEMBLY LHClick here
CHECK HEADLIGHT LEVELING MOTOR LH
Disconnect the headlight leveling motor LH connector.
Reconnect the except headlight leveling motor LH connector.
Clear the DTCs.
Turn the power switch on (IG) and wait for at least 10 seconds or more.
Check for DTCs.
| Result | ||||||
|---|---|---|---|---|---|---|
|
REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY LH (WIRE HARNESS)Click here
REPLACE HEADLIGHT LEVELING MOTOR LHClick here
CHECK HEADLIGHT LEVELING MOTOR RH
Disconnect the headlight leveling motor RH connector.
Reconnect the except headlight leveling motor RH connector.
Clear the DTCs.
Turn the power switch on (IG) and wait for at least 10 seconds or more.
Check for DTCs.
| Result | ||||||
|---|---|---|---|---|---|---|
|
REPLACE HEADLIGHT HOUSING SUB-ASSEMBLY RH (WIRE HARNESS)Click here
REPLACE HEADLIGHT LEVELING MOTOR RHClick here