DTC    B1593    No Response from Stereo Component Amplifier

DTC    B15D3    Stereo Component Amplifier Disconnected

for Preparation Click here


DESCRIPTION

The navigation computer sub-assembly and stereo component amplifier assembly are connected by the MOST communication line.
When a MOST communication error occurs between the navigation computer sub-assembly and stereo component amplifier assembly, these DTCs will be stored.

DTC No.
DTC Detection Condition
Trouble Area
B1593
No response to the diagnostic memory request from the master unit.
  1. Stereo component amplifier assembly power source circuit
  2. MOST circuit between radio receiver assembly and stereo component amplifier assembly
  3. MOST circuit between stereo component amplifier assembly and remote touch
  4. Stereo component amplifier assembly
  5. Navigation computer sub-assembly
B15D3
A device that is listed in the MOST network connected device record of the master unit is missing.

HINT:
For the MOST network, the navigation computer sub-assembly is the master unit.


WIRING DIAGRAM


E195264E05


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.CHECK OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)

  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:
      1. Electrical noise from radio waves generated by optional components or the wiring for those components may affect MOST communication.
      2. This DTC may be stored when a MOST communication error occurs due to electrical noise.



B
Go to step 3
A


2.REMOVE OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)

  1. Remove optional components (including associated wiring).

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


NEXT


3.CHECK DTC

  1. Clear the DTCs (Click here).

  1. Recheck for DTCs and check if the same DTCs are output again.

    OK:
    No DTCs are output.



NG
Go to step 4
OK

END 

4.CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY POWER SOURCE)

  1. Disconnect the H59 stereo component amplifier assembly connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H59-2 (GND) - Body ground
    		Always
    		Below 1 Ω
    H59-6 (GND2) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    H59-1 (+B) - H59-2 (GND)
    		Power switch off
    		11 to 14 V
    H59-3 (+B2) - H59-2 (GND)
    		Power switch off
    		11 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR

  1. Disconnect the H56 stereo component amplifier assembly connector.

  1. Disconnect the H50 radio receiver assembly connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H56-4 (MI+) - H50-11 (MO+)
    		Always
    		Below 1 Ω
    H56-10 (MI-) - H50-25 (MO-)
    		Always
    		Below 1 Ω
    H56-5 (SLDI) - H50-24 (SLDI)
    		Always
    		Below 1 Ω
    H56-4 (MI+) - Body ground
    		Always
    		10 kΩ or higher
    H56-10 (MI-) - Body ground
    		Always
    		10 kΩ or higher
    H56-5 (SLDI) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK HARNESS AND CONNECTOR

  1. Disconnect the H56 stereo component amplifier assembly connector.

  1. Disconnect the H71 remote touch connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H56-6 (MO+) - H71-6 (MI+)
    		Always
    		Below 1 Ω
    H56-12 (MO-) - H71-5 (MI-)
    		Always
    		Below 1 Ω
    H56-11 (SLDO) - H71-7 (SLDI)
    		Always
    		Below 1 Ω
    H56-6 (MO+) - Body ground
    		Always
    		10 kΩ or higher
    H56-12 (MO-) - Body ground
    		Always
    		10 kΩ or higher
    H56-11 (SLDO) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


7.REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY

  1. Replace the stereo component amplifier assembly (Click here).

  1. Clear the DTCs (Click here).

  1. Recheck for DTCs and check if the same DTCs are output again.

    OK:
    No DTCs are output.



NG
REPLACE NAVIGATION COMPUTER SUB-ASSEMBLY (Click here)
OK

END