DTC B1593: No Response from Stereo Component Amplifier; DTC B15D3: Stereo Component Amplifier Disconnected: Procedure

1. Check for optional components
   1. Check that optional components (including associated wiring) which generate radio waves are not installed.
      RESULT
      
      

      Result	Proceed to
      Optional components (including associated wiring) are installed.	A
      Optional components (including associated wiring) are not installed.	B

      HINT: 

      • Electrical noise from radio waves generated by optional components or the wiring for those components may affect AVC-LAN communication.
      • This DTC may be stored when an AVC-LAN communication error occurs due to electrical noise.

B → See step   3 

A: Go to next step 

1. Remove optional components (including associated wiring).
   NOTE:

   Do not remove optional components or associated wiring without the permission of the customer.

NEXT: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Check for DTCs and check if the same trouble occurs again.

   OK

   No DTCs are output.

NG → See step   4 

OK → END 

1. Disconnect the L5 and L34 stereo component amplifier assembly connectors.
   Fig 1: Checking Harness And Connector (Stereo Component Amplifier - Battery And Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L34-2 (GND) - Body ground	Always	Below 1 Ω
   L34-6 (GND2) - Body ground

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   L34-1 (+B) - Body ground	Always	11 to 14 V
   L34-3 (+B2) - Body ground
   L5-12 (ACC) - Body ground	Ignition switch ACC

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Stereo Component Amplifier Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the D52 navigation receiver assembly connector.
2. Disconnect the L5 stereo component amplifier assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D52-5 (ATX+) - L5-8 (TX+)	Always	Below 1 Ω
   D52-15 (ATX-) - L5-7 (TX-)	Always	Below 1 Ω
   D52-5 (ATX+) - Body ground	Always	10 kΩ or higher
   D52-15 (ATX-) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the stereo component amplifier. Refer to REMOVAL .
2. Clear the DTCs. Refer to DTC CHECK / CLEAR .
3. Recheck for DTCs and check if the same trouble occurs again.

   OK

   No DTCs are output.

NG → See step   7 

OK → END (STEREO COMPONENT AMPLIFIER IS FAULTY)