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 MOST communication.
      • This DTC may be stored when a MOST 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. Recheck for DTCs and check if the same DTC is output again.

   OK

   No DTCs are output.

NG → See step   4 

OK → END 

1. Disconnect the stereo component amplifier assembly connector.
   Fig 1: Stereo Component Amplifier Assembly Connector

   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
   O18-2 (GND) - Body ground	Always	Below 1 Ω
   O18-6 (GND2) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   O18-1 (+B) - O18-2 (GND)	Always	11 to 14 V
   O18-3 (+B2) - O18-2 (GND)	Always	11 to 14 V

   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 display and navigation module display connector.
   Fig 2: Display And Navigation Module Display Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the stereo component amplifier assembly connector.
   Fig 3: Stereo Component Amplifier Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disconnect the radio receiver assembly connector.
   Fig 4: Radio Receiver Assembly Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Measure the resistance between the display and navigation module display and stereo component amplifier assembly according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G6-1 (MI+) - O15-6 (MO+)	Always	Below 1 Ω
   G6-5 (MI-) - G15-12 (MO-)	Always	Below 1 Ω
   G6-2 (SLDI) - O15-11 (SLDO)	Always	Below 1 Ω
   G6-1 (MI+) - Body ground	Always	10 kΩ or higher
   G6-5 (MI-) - Body ground	Always	10 kΩ or higher
   G6-2 (SLDI) - Body ground	Always	10 kΩ or higher

5. Measure the resistance between the radio receiver assembly and stereo component amplifier assembly according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G12-11 (MO+) - O15-4 (MI+)	Always	Below 1 Ω
   G12-25 (MO-) - O15-10 (MI-)	Always	Below 1 Ω
   G12-24 (SLDI) - O15-5 (SLDI)	Always	Below 1 Ω
   G12-11 (MO+) - Body ground	Always	10 kΩ or higher
   G12-25 (MO-) - Body ground	Always	10 kΩ or higher
   G12-24 (SLDI) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Display and Navigation Module Display)
   *2	Front view of wire harness connector (to Stereo Component Amplifier Assembly)
   *3	Front view of wire harness connector (to Radio Receiver Assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

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

   OK

   No DTCs are output.

NG → See step   7 

OK → END