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 or B2432 is not output.

NG → See step   2 

OK → See step   5 

1. Disconnect the D7 main body ECU (multiplex network body ECU) connector.
2. Disconnect the N2 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
   D7-7 (SMR) - N2-3 (LIN)	Always	Below 1 Ω
   N2-3 (LIN) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the D7 main body ECU (multiplex network body ECU) connector.
2. Connect an oscilloscope to the N2 inner rear view mirror assembly connector.
   Fig 1: Identifying Inner Rear View Mirror Assembly Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the waveform.
   Fig 2: Identifying Waveform

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   Tester Connection	Tool Setting	Condition	Specified Condition
   N2-3 (LIN) - Body ground	2 V/DIV., 20 ms./DIV.	Engine switch on (IG)	Correct waveform is as shown

   TEXT IN ILLUSTRATION
   
   

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

NG → See step   4 

OK → See step   6