Navigation System (For HDD)
NAVIGATION / MULTI INFO DISPLAY: NAVIGATION SYSTEM (for HDD): 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 13 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 13 speakers)
HINT
* For the MOST network, the navigation computer sub-assembly 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 Navigation System (For HDD).
(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
B -- CHECK MOST COMMUNICATION CONNECTORS
C -- CHECK MOST COMMUNICATION CONNECTORS
D -- CHECK HARNESS AND CONNECTOR
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 navigation computer sub-assembly and radio receiver assembly has any connection problems Electronic Circuit Inspection Procedure.
(b) Display the "MOST Line Check" screen and check the result Navigation System (For HDD).
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 H50 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 H50 radio receiver assembly connector.
(b) Disconnect the H62 navigation computer 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 -- REPLACE NAVIGATION COMPUTER SUB-ASSEMBLY 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 has any connection problems Electronic Circuit Inspection Procedure.
(b) Display the "MOST Line Check" screen and check the result Navigation System (For HDD).
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 H56 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 H56 stereo component amplifier assembly connector.
(b) Disconnect the H50 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 has any connection problems Electronic Circuit Inspection Procedure.
(b) Display the "MOST Line Check" screen and check the result Navigation System (For HDD).
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 H71 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 Disassembly
12. CHECK HARNESS AND CONNECTOR
(a) Disconnect the H71 remote touch connector.
(b) Disconnect the H56 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 H62 navigation computer sub-assembly connector.
(b) Disconnect the H50 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 H50 radio receiver assembly connector.
(b) Disconnect the H56 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 H56 stereo component amplifier assembly connector.
(b) Disconnect the H71 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 H71 remote touch connector.
(b) Disconnect the H62 navigation computer 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.
17. REPLACE REMOTE OPERATION BOARD
(a) Replace the remote operation board Disassembly.
(b) Clear the DTCs Navigation System (For HDD).
(c) Recheck for DTCs and check if the same DTCs are output again.
Result:
B -- REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY
A -- END
18. REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY
(a) Replace the stereo component amplifier assembly Removal.
(b) Clear the DTCs Navigation System (For HDD).
(c) Recheck for DTCs and check if the same DTCs are output again.
Result:
B -- REPLACE RADIO RECEIVER ASSEMBLY
A -- END
19. REPLACE RADIO RECEIVER ASSEMBLY
(a) Replace the radio receiver assembly Removal.
(b) Clear the DTCs Navigation System (For HDD).
(c) Recheck for DTCs and check if the same DTCs are output again.
Result:
B -- REPLACE NAVIGATION COMPUTER SUB-ASSEMBLY Removal
A -- END