Lexus NX manuals

Lexus NX: Headlight Swivel ECU LH Communication (B2410,B2411,B2424,B2425)

Lexus NX Service Manual / Vehicle Exterior / Lighting (ext) / Afs (adaptive Front-lighting System) / Headlight Swivel ECU LH Communication (B2410,B2411,B2424,B2425)

DESCRIPTION

Each headlight ECU sub-assembly and headlight swivel and leveling motor communicate via LIN communication.

The headlight swivel and leveling motor operates according to power supplied and automatic headlight beam level control signals from its respective headlight ECU sub-assembly and sends its operating state to the headlight ECU sub-assembly.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

B2410

Headlight Swivel ECU LH Communication
  • The power switch is on (IG).
  • LIN communication error
  • 10 seconds or more
  • Headlight unit assembly LH
  • Headlight ECU sub-assembly LH

B2411

Headlight Swivel ECU RH Communication
  • The power switch is on (IG).
  • LIN communication error
  • 10 seconds or more
  • Headlight unit assembly RH
  • Harness or connector
  • Headlight ECU sub-assembly RH
  • Headlight ECU sub-assembly LH

B2424

Headlight Beam Level Control Motor LH Lost Communication
  • The power switch is on (IG).
  • LIN communication error
  • 10 seconds or more
  • Headlight unit assembly LH
  • Headlight ECU sub-assembly LH

B2425

Headlight Beam Level Control Motor RH Lost Communication
  • The power switch is on (IG).
  • LIN communication error
  • 10 seconds or more
  • Headlight unit assembly RH
  • Harness or connector
  • Headlight ECU sub-assembly RH
  • Headlight ECU sub-assembly LH

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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.

Click here

PROCEDURE

1.

CHECK FOR DTC

(a) Clear the DTCs.

Click here

Body Electrical > AFS > Clear DTCs

(b) Turn the power switch on (IG) and wait for at least 10 seconds or more.

(c) Check for DTCs.

Click here

Body Electrical > AFS > Trouble Codes

OK:

DTC B2410, B2411, B2424 and B2425 are not outputs.

Result

Proceed to

OK

A

NG (DTC B2410 is output)

B

NG (DTC B2411 is output)

C

NG (DTC B2410 and B2411 are output)

D

NG (DTC B2410 and B2424 are output)

E

NG (DTC B2411 and B2425 are output)

F

NG (DTC B2424 is output)

G

NG (DTC B2425 is output)
A

USE SIMULATION METHOD TO CHECK

C

GO TO STEP 3

D

GO TO STEP 6

E

GO TO STEP 10

F

GO TO STEP 11

G

GO TO AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM

B

2.

CHECK HEADLIGHT ECU SUB-ASSEMBLY LH

(a) Remove the headlight ECU sub-assembly LH as a unit with the connectors still connected.

Click here

(b) Disconnect the A20 headlight ECU sub-assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A20-19 (LINS) - C-4

Always

Below 1 Ω
OK

REPLACE HEADLIGHT UNIT ASSEMBLY LH

NG

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

3.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - HEADLIGHT ECU SUB-ASSEMBLY RH)

(a) Disconnect the A19 headlight ECU sub-assembly LH connector.

(b) Disconnect the A20 headlight ECU sub-assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A19-19 (LINS) - A20-19 (LINS)

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HEADLIGHT ECU SUB-ASSEMBLY LH (LINS TERMINAL SIGNAL OUTPUT)

*a

Front view of wire harness connector

(to Headlight ECU Sub-assembly RH)

(a) Disconnect the headlight ECU sub-assembly RH connector.

(b) Using the Techstream, check the waveform.

OK:

Tester Connection

Switch Condition

Specified Condition

A20-19 (LINS) - Body ground

Power switch on (IG)

Pulse generation
NG

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

OK

5.

CHECK HEADLIGHT ECU SUB-ASSEMBLY RH

(a) Remove the headlight ECU sub-assembly RH as a unit with the connectors still connected.

Click here

(b) Disconnect the A19 headlight ECU sub-assembly LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A19-19 (LINS) - C-4

Always

Below 1 Ω
OK

REPLACE HEADLIGHT UNIT ASSEMBLY RH

NG

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

6.

CHECK HEADLIGHT ECU SUB-ASSEMBLY RH

(a) Disconnect the A20 headlight ECU sub-assembly RH connector.

(b) Clear the DTCs.

Click here

(c) Turn the power switch on (IG) and wait for at least 10 seconds or more.

(d) Check for DTCs.

Click here

Result

Proceed to

DTC B2411 is output

A

DTC B2410 and B2411 are output

B
B

GO TO STEP 8

A

7.

CHECK HEADLIGHT ECU SUB-ASSEMBLY RH

(a) Remove headlight ECU sub-assembly RH.

Click here

(b) Reconnect the A20 headlight ECU sub-assembly RH connector.

(c) Clear the DTCs.

Click here

Body Electrical > AFS > Clear DTCs

(d) Turn the power switch on (IG) and wait for at least 10 seconds or more.

(e) Check for DTCs.

Click here

Body Electrical > AFS > Trouble Codes

Result

Proceed to

DTC B2411 is output

A

DTC B2410 and B2411 are output

B
A

REPLACE HEADLIGHT UNIT ASSEMBLY RH

B

REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH

8.

CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - HEADLIGHT ECU SUB-ASSEMBLY RH)

(a) Disconnect the A19 headlight ECU sub-assembly LH connector.

(b) Disconnect the A20 headlight ECU sub-assembly RH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A19-19 (LINS) or A20-19 (LINS) - Body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

CHECK HEADLIGHT ECU SUB-ASSEMBLY LH

(a) Remove headlight ECU sub-assembly LH.

Click here

(b) Reconnect the A19 headlight ECU sub-assembly LH connector.

(c) Clear the DTCs.

Click here

Body Electrical > AFS > Clear DTCs

(d) Turn the power switch on (IG) and wait for at least 10 seconds or more.

(e) Check for DTCs.

Click here

Body Electrical > AFS > Trouble Codes

Result

Proceed to

DTC B2410 is output

A

DTC B2410 and B2411 are output

B
A

REPLACE HEADLIGHT UNIT ASSEMBLY LH

B

REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH

10.

CHECK HEADLIGHT ECU SUB-ASSEMBLY LH

(a) Replace the headlight ECU sub-assembly LH with a new one.

Click here

(b) Clear the DTCs.

Click here

Body Electrical > AFS > Clear DTCs

(c) Turn the power switch on (IG) and wait for at least 10 seconds or more.

(d) Check for DTCs.

Click here

Body Electrical > AFS > Trouble Codes

OK:

DTC B2410 and B2424 are not outputs.

OK

END (HEADLIGHT ECU SUB-ASSEMBLY LH WAS DEFECTIVE)
NG

REPLACE HEADLIGHT UNIT ASSEMBLY LH

11.

CHECK HEADLIGHT ECU SUB-ASSEMBLY RH

(a) Replace the headlight ECU sub-assembly RH with a new one.

Click here

(b) Clear the DTCs.

Click here

Body Electrical > AFS > Clear DTCs

(c) Turn the power switch on (IG) and wait for at least 10 seconds or more.

(d) Check for DTCs.

Click here

Body Electrical > AFS > Trouble Codes

OK:

DTC B2411 and B2425 are not outputs.

OK

END (HEADLIGHT ECU SUB-ASSEMBLY RH WAS DEFECTIVE)
NG

REPLACE HEADLIGHT UNIT ASSEMBLY RH

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