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

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 

1. Disconnect the A53 AFS ECU (headlight swivel ECU assembly) connector.
   Fig 1: A53 AFS ECU (Headlight Swivel ECU Assembly) & T5 Inner Rear View Mirror Assembly Connectors

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2. Disconnect the T5 inner rear view mirror assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A53-30 (LH+) - T5-12 (LIN)	Always	Below 1 Ω
   T5-12 (LIN) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to AFS ECU (Headlight Swivel ECU Assembly))
   *2	Front view of wire harness connector (to Inner Rear View Mirror Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the A53 AFS ECU (headlight swivel ECU assembly) connector.
2. Connect an oscilloscope to the T5 inner rear view mirror assembly connector.
   Fig 2: T5 Inner Rear View Mirror Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the waveform.
   Fig 3: Identifying Waveform Graph

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   Tester Connection	Tool Setting	Condition	Specified Condition
   T5-12 (LIN) - T5-2 (E)	2 V/DIV., 20 ms./DIV.	Engine switch on (IG)	Correct waveform is as shown

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Inner Rear View Mirror Assembly)

NG → See step   4 

OK → See step   6