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B15D0





NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM: B15D0: MOST Communication Malfunction
B15D0 - MOST Communication Malfunction

DESCRIPTION

* This DTC is stored when the MOST network connections cannot be established after the master unit is activated.





* *: w/ Rear Seat Entertainment System

HINT
* The MOST network connections cannot be established.
* Errors may occur in MOST communication between devices due to problems such as electrical noise.

WIRING DIAGRAM









INSPECTION PROCEDURE

PROCEDURE

1. CHECK MOST LINE

(a) Enter "System Check" Operation Check.





(b) Check the result on the "System Check Mode" screen.

Text in Illustration





Result





*: w/ Rear Seat Entertainment System

HINT
* When "NCON" is displayed for more than 1 item, proceed to the step for the device that has the smallest node position number.
* The "System Check Mode" screen can be displayed only when DTC B15D0 is stored.

D -- CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - STEREO COMPONENT AMPLIFIER)

C -- CHECK MOST COMMUNICATION CONNECTOR

B -- CHECK MOST COMMUNICATION CONNECTOR
A -- Continue to next step.

2. CHECK MOST COMMUNICATION CONNECTOR

(a) Check the MOST communication line connector.

(1) Check if the MOST communication line connectors of the display and navigation module display and the stereo component amplifier assembly have any connection problems Electronic Circuit Inspection Procedure.

(b) Enter the "System Check Mode" screen and check the result Operation Check.

Result





HINT
When the malfunction in the MOST network is repaired, the screen cannot be changed to the "MOST Line Check" screen.

B -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
A -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER)

(a) Disconnect the R34*1 or H10*2 stereo component amplifier assembly connector.





*1: for DVD Changer Models

*2: for CD Changer Models

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

Standard Voltage:

for DVD Changer Models
for CD Changer Models










Text in Illustration





Result





C -- CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - DISPLAY AND NAVIGATION MODULE DISPLAY)

B -- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Removal

A -- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Removal

4. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - DISPLAY AND NAVIGATION MODULE DISPLAY)

(a) Disconnect the R34*1 or H10*2 stereo component amplifier assembly connector.

*1: for DVD Changer Models

*2: for CD Changer Models

(b) Disconnect the H2 display and navigation module display connector.

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

Standard Resistance:

for DVD Changer Models
for CD Changer Models










NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Removal

5. CHECK MOST COMMUNICATION CONNECTOR

(a) Check the MOST communication line connector.

(1) Check if the MOST communication line connectors of the stereo component amplifier assembly and radio receiver assembly have any connection problems Electronic Circuit Inspection Procedure.

(b) Enter the "System Check Mode" screen and check the result Operation Check.

Result





HINT
When the malfunction in the MOST network is repaired, the screen cannot be changed to the "MOST Line Check" screen.

B -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
A -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER)

(a) Disconnect the H1 radio receiver assembly connector.





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

Standard Voltage:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - STEREO COMPONENT AMPLIFIER)

OK -- REPLACE RADIO RECEIVER ASSEMBLY Removal

7. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - STEREO COMPONENT AMPLIFIER)

(a) Disconnect the H1 radio receiver assembly connector.

(b) Disconnect the R34*1 or H10*2 stereo component amplifier assembly connector.

*1: for DVD Changer Models

*2: for CD Changer Models

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

Standard Resistance:

for DVD Changer Models
for CD Changer Models










Result





C -- REPAIR OR REPLACE HARNESS OR CONNECTOR

B -- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Removal

A -- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Removal

8. CHECK MOST COMMUNICATION CONNECTOR

(a) Check the MOST communication line connector.

(1) Check if the MOST communication line connectors of the radio receiver assembly and multi-display controller sub-assembly Electronic Circuit Inspection Procedure.

(b) Enter the "System Check Mode" screen and check the result Operation Check.

Result





HINT
When the malfunction in the MOST network is repaired, the screen cannot be changed to the "MOST Line Check" screen.

B -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
A -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY CONTROLLER)

(a) Disconnect the H16 multi-display controller sub-assembly connector.





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

Standard Voltage:





Text in Illustration





NG -- CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY CONTROLLER - RADIO RECEIVER)

OK -- REPLACE MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY Removal

10. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY CONTROLLER - RADIO RECEIVER)

(a) Disconnect the H16 multi-display controller sub-assembly connector.

(b) Disconnect the H1 radio receiver assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE RADIO RECEIVER ASSEMBLY Removal

11. CHECK HARNESS AND CONNECTOR (DISPLAY AND NAVIGATION MODULE DISPLAY - STEREO COMPONENT AMPLIFIER)

(a) Disconnect the H2 display and navigation module display connector.

(b) Disconnect the R34*1 or H10*2 stereo component amplifier assembly connector.

*1: for DVD Changer Models

*2: for CD Changer Models

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

Standard Resistance:

for DVD Changer Models
for CD Changer Models










NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

12. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - RADIO RECEIVER)

(a) Disconnect the R34*1 or H10*2 stereo component amplifier assembly connector.

*1: for DVD Changer Models

*2: for CD Changer Models

(b) Disconnect the H1 radio receiver assembly connector.

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

Standard Resistance:

for DVD Changer Models
for CD Changer Models










Result





C -- REPAIR OR REPLACE HARNESS OR CONNECTOR

B -- CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - DISPLAY AND NAVIGATION MODULE DISPLAY)
A -- Continue to next step.

13. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - MULTI-DISPLAY CONTROLLER)

(a) Disconnect the H1 radio receiver assembly connector.

(b) Disconnect the H16 multi-display controller sub-assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

14. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY CONTROLLER - DISPLAY AND NAVIGATION MODULE DISPLAY)

(a) Disconnect the H16 multi-display controller sub-assembly connector.

(b) Disconnect the H2 display and navigation module display connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

15. CHECK FOR DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Check for DTCs and check if the same trouble occurs again.

OK:

No DTCs are output.

NG -- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Removal

OK -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure

16. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER - DISPLAY AND NAVIGATION MODULE DISPLAY)

(a) Disconnect the H1 radio receiver assembly connector.

(b) Disconnect the H2 display and navigation module display assembly connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

17. CHECK FOR DTC

(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(b) Check for DTCs and check if the same trouble occurs again.

OK:

No DTCs are output.

NG -- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Removal

OK -- USE SIMULATION METHOD TO CHECK Electronic Circuit Inspection Procedure
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