B15D0

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

DESCRIPTION

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





HINT
- For the MOST network, the display and navigation module display is the master unit.
- Errors may occur in MOST communication between devices due to problems such as electrical noise.

WIRING DIAGRAM









INSPECTION PROCEDURE

NOTICE:
After replacing the radio receiver assembly of vehicles subscribed to pay-type satellite radio broadcasts, registration of the XM radio ID is necessary.

PROCEDURE

1. PERFORM MOST LINE CHECK

(a) Display the "MOST Line Check" screen Reading and Clearing Diagnostic Trouble Codes.





(b) Check the result on the "MOST Line Check" screen.

Result





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 "MOST Line Check" screen can be displayed only when DTC B15D0 is stored.

Text in Illustration





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

C -- CHECK MOST COMMUNICATION CONNECTOR

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

2. CHECK MOST COMMUNICATION CONNECTOR

(a) Check MOST communication line connector.

(1) Check if a MOST communication line connector between the display and navigation module display and radio receiver assembly has any connection problems Electronic Circuit Inspection Procedure.

(b) Display the "MOST Line Check" screen and check the result Reading and Clearing Diagnostic Trouble Codes.

Result





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

B -- END
A -- Continue to next step.

3. CHECK HARNESS AND CONNECTOR (WAKE UP SIGNAL)

(a) Disconnect the F41 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 - DISPLAY AND NAVIGATION MODULE DISPLAY)

OK -- REPLACE RADIO RECEIVER ASSEMBLY Removal

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

(a) Disconnect the F41 radio receiver assembly connector.

(b) Disconnect the F48 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 -- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Removal

5. CHECK MOST COMMUNICATION CONNECTOR

(a) Check MOST communication line connector.

(1) Check if a MOST communication line connector between the radio receiver assembly and stereo component amplifier assembly has any connection problems Electronic Circuit Inspection Procedure.

(b) Display the "MOST Line Check" screen and check the result Reading and Clearing Diagnostic Trouble Codes.

Result





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

B -- END
A -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (WAKE UP SIGNAL)

(a) Disconnect the F42 stereo component amplifier 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 (STEREO COMPONENT AMPLIFIER - RADIO RECEIVER)

OK -- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Removal

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

(a) Disconnect the F42 stereo component amplifier assembly connector.

(b) Disconnect the F41 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

8. CHECK MOST COMMUNICATION CONNECTOR

(a) Check MOST communication line connector.

(1) Check if a MOST communication line connector between the stereo component amplifier assembly and television display assembly has any connection problems Electronic Circuit Inspection Procedure.

(b) Display the "MOST Line Check" screen and check the result Reading and Clearing Diagnostic Trouble Codes.

Result





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

B -- END
A -- Continue to next step.

9. CHECK HARNESS AND CONNECTOR (WAKE UP SIGNAL)

(a) Disconnect the L34 television display 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 (TELEVISION DISPLAY - STEREO COMPONENT AMPLIFIER)

OK -- REPLACE TELEVISION DISPLAY ASSEMBLY Removal

10. CHECK HARNESS AND CONNECTOR (TELEVISION DISPLAY - STEREO COMPONENT AMPLIFIER)

(a) Disconnect the L34 television display assembly connector.

(b) Disconnect the F42 stereo component amplifier 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 STEREO COMPONENT AMPLIFIER ASSEMBLY Removal

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

(a) Disconnect the F48 display and navigation module display connector.

(b) Disconnect the F41 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 -- Continue to next step.

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

(a) Disconnect the F41 radio receiver assembly connector.

(b) Disconnect the F42 stereo component amplifier 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.

13. CONFIRM MODEL

(a) Choose the model to be inspected.

Result





B -- CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - TELEVISION DISPLAY)
A -- Continue to next step.

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

(a) Disconnect the F42 stereo component amplifier assembly connector.

(b) Disconnect the F48 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 DTC

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

(b) Recheck 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 How To Proceed With Troubleshooting

16. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER - TELEVISION DISPLAY)

(a) Disconnect the F42 stereo component amplifier assembly connector.

(b) Disconnect the L34 television display assembly.

(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 HARNESS AND CONNECTOR (TELEVISION DISPLAY - DISPLAY AND NAVIGATION MODULE DISPLAY)

(a) Disconnect the L34 television display assembly.

(b) Disconnect the F48 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.

18. CHECK DTC

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

(b) Recheck 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 How To Proceed With Troubleshooting