Speaker Circuit: Procedure

1. Check the output waveform.
   Fig 1: Identifying A69 Vehicle Approaching Speaker Assembly Connector Terminal And Output Waveform

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the A69 vehicle approaching speaker assembly connector.
   2. Connect an oscilloscope to terminal A69-2 (+) and A69-1 (-).
   3. Check the signal waveform according to the condition(s) in the table below.

      Item	Condition
      Tool setting	1 V/DIV., 200 ms./DIV.
      Vehicle condition	Speaker operating*

      *: Use the operation check procedure to operate the speaker. Refer to OPERATION CHECK .

      OK

      The waveform is displayed as shown in the illustration.

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Vehicle Approaching Speaker Assembly)

NG → See step   2 

OK → See step   4 

1. Disconnect the L140 vehicle approaching speaker controller connector.
2. Disconnect the A69 vehicle approaching speaker assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L140-3 (SP+) - A69-2 (+)	Always	Below 1 Ω
   L140-8 (SP-) - A69-1 (-)	Always	Below 1 Ω
   L140-3 (SP+) - Body ground	Always	10 kΩ or higher
   L140-8 (SP-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   3