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
* If a short occurs in a speaker circuit, the sound from the corresponding speaker will be low or almost impossible to hear. If the volume is turned up in this situation, to prevent excessive current flow due to the short circuit, the stereo component amplifier assembly stops operating when its output exceeds a certain level. When the operation of the stereo component amplifier assembly stops, the navigation system will not function normally. This is because MOST communication will stop due to the shut down of the amplifier causing an error in the MOST network. The stereo component amplifier assembly will start operating again when the power switch is turned off and back on (ACC) again. However, the amplifier will stop operating again if its output exceeds a certain level. (for 15 speakers)
* When the stereo component amplifier assembly stops operating and a malfunction occurs in the navigation system due to a short in a speaker circuit, this DTC will be stored. (for 15 speakers)
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. (w/ SDARS System)
PROCEDURE
1. CONFIRM MODEL
(a) Choose the model to be inspected.
Result:
B -- PERFORM MOST LINE CHECK
A -- Continue to next step.
2. CONFIRM SYMPTOMS
(a) Power switch off.
(b) Turn the power switch on (ACC) and check if the audio system activates and if the speakers operate.
HINT
* Choose a source such as radio so that sound can be output from the speakers.
* If sound from the speakers is low, turn up the volume.
Result:
HINT
* If a short occurs in a speaker circuit, the sound from the corresponding speaker will be low or almost impossible to hear. If the volume is turned up in this situation, to prevent excessive current flow due to the short circuit, the stereo component amplifier assembly stops operating when its output exceeds a certain level. When the operation of the stereo component amplifier assembly stops, the navigation system will not function normally. This is because MOST communication will stop due to the shut down of the amplifier causing an error in the MOST network. The stereo component amplifier assembly will start operating again when the power switch is turned off and back on (ACC) again. However, the amplifier will stop operating again if its output exceeds a certain level.
* When the stereo component amplifier assembly stops operating and a malfunction occurs in the navigation system due to a short in a speaker circuit, this DTC will be stored. In this case, check each speaker circuit and repair or replace malfunctioning parts, and then recheck for DTCs.
B -- PERFORM MOST LINE CHECK
A -- GO TO AUDIO AND VISUAL SYSTEM (w/ Navigation System) Speaker Circuit
3. 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
C -- CHECK MOST COMMUNICATION CONNECTORS
B -- CHECK MOST COMMUNICATION CONNECTORS
A -- Continue to next step.
4. CHECK MOST COMMUNICATION CONNECTORS
(a) Check the MOST communication line connectors.
(1) Check if the MOST communication line connector between the display and navigation module display and radio receiver assembly have 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.
5. CHECK HARNESS AND CONNECTOR (WAKE-UP SIGNAL)
(a) Disconnect the F70 radio receiver assembly connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- CHECK HARNESS AND CONNECTOR
OK -- REPLACE RADIO RECEIVER ASSEMBLY Removal
6. CHECK HARNESS AND CONNECTOR
(a) Disconnect the F70 radio receiver assembly connector.
(b) Disconnect the F32 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
7. CHECK MOST COMMUNICATION CONNECTORS
(a) Check the MOST communication line connectors.
(1) Check if the MOST communication line connector between the radio receiver assembly and stereo component amplifier assembly have 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.
8. 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:
NG -- CHECK HARNESS AND CONNECTOR
OK -- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Removal
9. CHECK HARNESS AND CONNECTOR
(a) Disconnect the F42 stereo component amplifier assembly connector.
(b) Disconnect the F70 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
10. CHECK MOST COMMUNICATION CONNECTORS
(a) Check the MOST communication line connectors.
(1) Check if the MOST communication line connector between the stereo component amplifier assembly and remote touch have 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.
11. CHECK HARNESS AND CONNECTOR (WAKE-UP SIGNAL)
(a) Disconnect the F41 remote touch connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
NG -- CHECK HARNESS AND CONNECTOR
OK -- REPLACE REMOTE OPERATION BOARD Removal
12. CHECK HARNESS AND CONNECTOR
(a) Disconnect the F41 remote touch 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
13. CHECK HARNESS AND CONNECTOR
(a) Disconnect the F32 display and navigation module display connector.
(b) Disconnect the F70 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.
14. CHECK HARNESS AND CONNECTOR
(a) Disconnect the F70 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.
15. CHECK HARNESS AND CONNECTOR
(a) Disconnect the F42 stereo component amplifier assembly connector.
(b) Disconnect the F41 remote touch 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.
16. CHECK HARNESS AND CONNECTOR
(a) Disconnect the F41 remote touch connector.
(b) Disconnect the F32 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.
17. CHECK DTC
(a) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.
(b) Recheck for DTCs and check if the same DTC is output again.
Result:
B -- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY Removal
A -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting