DTC    B156E    No Response from Multi-media Interface ECU

DTC    B156B    Multi-media Interface ECU Disconnected

for Preparation Click here


DESCRIPTION

The navigation computer sub-assembly and multi-media interface ECU assembly are connected by the AVC-LAN communication line.
When an AVC-LAN communication error occurs between the navigation computer sub-assembly and multi-media interface ECU assembly, these DTCs will be stored.

DTC No.
DTC Detection Condition
Trouble Area
B156E
No response to the diagnostic memory request from the master unit.
  1. Multi-media interface ECU assembly power source circuit
  2. AVC-LAN circuit between navigation computer sub-assembly and multi-media interface ECU assembly
  3. Multi-media interface ECU assembly
  4. Navigation computer sub-assembly
B156B*1
A device that is listed in the AVC-LAN connected device record of the master unit is missing.

HINT:
  1. *1: Even if no fault is present, this DTC may be stored depending on the auxiliary battery condition or hybrid system start voltage.
  2. The navigation computer sub-assembly is the master unit.


WIRING DIAGRAM


E176693E16


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 AVC-LAN communication.
      2. This DTC may be stored when an AVC-LAN 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

  1. Disconnect the H69 multi-media interface ECU assembly connector.

  1. Disconnect the H63 navigation computer sub-assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H69-12 (+B) - H63-12 (+B)
    		Always
    		Below 1 Ω
    H69-11 (ACC) - H63-11 (ACC)
    		Always
    		Below 1 Ω
    H69-7 (GND) - H63-7 (GND)
    		Always
    		Below 1 Ω
    H69-9 (TX1+) - H63-9 (TX+)
    		Always
    		Below 1 Ω
    H69-10 (TX1-) - H63-10 (TX-)
    		Always
    		Below 1 Ω
    H69-12 (+B) - Body ground
    		Always
    		10 kΩ or higher
    H69-11 (ACC) - Body ground
    		Always
    		10 kΩ or higher
    H69-7 (GND) - Body ground
    		Always
    		10 kΩ or higher
    H69-9 (TX1+) - Body ground
    		Always
    		10 kΩ or higher
    H69-10 (TX1-) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (MULTI-MEDIA INTERFACE ECU ASSEMBLY POWER SOURCE)

  1. Reconnect the H63 navigation computer sub-assembly connector.

  1. Disconnect the H69 multi-media interface ECU assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    H69-7 (GND) - 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
    H69-12 (+B) - H69-7 (GND)
    		Power switch off
    		11 to 14 V
    H69-11 (ACC) - H69-7 (GND)
    		Power switch on (ACC)
    		11 to 14 V



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


6.REPLACE MULTI-MEDIA INTERFACE ECU ASSEMBLY

  1. Replace the multi-media interface ECU 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