DTC B124D: Lost Communication with AFS LIN; DTC B2432: Lost Communication with Automatic High Beam Sensor: Procedure

CHECK FOR DTC
1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Check for DTCs. Refer to DTC CHECK / CLEAR .
  OK
  
  DTC B124D is not output.
NG → See step 2

OK → See step 5

CHECK HARNESS AND CONNECTOR (HEADLIGHT SWIVEL ECU ASSEMBLY - INNER REAR VIEW MIRROR ASSEMBLY)

Disconnect the A46 headlight swivel ECU connector.
Disconnect the W5 inner rear view mirror connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
A46-30 (LH+) - W5-12 (LIN)	Always	Below 1 Ω
A46-30 (LH+) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

CHECK INNER REAR VIEW MIRROR ASSEMBLY (OPERATION)
1. Temporarily replace the inner rear view mirror with a new or normally functioning one. Refer to REMOVAL .
2. Check for DTCs. Refer to DTC CHECK / CLEAR .
  OK
  
  DTC B124D or B2432 is not output.
NG → See step 4

OK → See step 6
REPLACE HEADLIGHT SWIVEL ECU ASSEMBLY. Refer to REMOVAL
USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING
END (REPLACE INNER REAR VIEW MIRROR ASSEMBLY). Refer to REMOVAL