DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING)
CONFIRM SYMPTOMS
CHECK MOST COMMUNICATION CONNECTORS
CONFIRM SYMPTOMS
CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY WAKE UP LINE)
CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)
CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)
REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY
CLEAR DTC
CHECK DTC
MOST COMMUNICATION CONNECTORS
CONFIRM SYMPTOMS
CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY WAKE UP LINE)
CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)
CONFIRM SYMPTOMS
CHECK HARNESS AND CONNECTOR (TELEVISION DISPLAY ASSEMBLY Wake Up LINE)
CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - TELEVISION DISPLAY ASSEMBLY)
CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY)
CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - TELEVISION DISPLAY ASSEMBLY)
CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - TELEVISION DISPLAY ASSEMBLY)
REPLACE TELEVISION DISPLAY ASSEMBLY
CLEAR DTC
CHECK DTC
DTC B15D0 MOST Communication Malfunction
DESCRIPTION
This DTC is stored when the MOST network cannot be established after the master unit is activated.
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 engine 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.
| DTC Code | DTC Detection Condition | Trouble Area |
| B15D0 |
MOST network cannot be established. |
MOST line check
MOST communication line connector
MOST communication line
Television display assembly (w/ Rear Seat Entertainment System)
Stereo component amplifier assembly
Multi-media module receiver assembly
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For the MOST network, the multi-media module receiver assembly is the master unit.
Errors may occur in MOST communication between devices due to problems such as electrical noise.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.CHECK OPTIONAL COMPONENTS (INCLUDING ASSOCIATED WIRING) |
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 installed.
DTCs are not output. | B |
Electrical noise from radio waves generated by optional components or the wiring for those components may affect AVC-LAN communication.
These DTCs may be stored when an AVC-LAN communication error occurs due to electrical noise.
Turn the engine switch off.
Turn the engine switch on (ACC) and check if the audio system activates and if the speakers operate.
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| Result | Proceed to |
| Even after the engine switch is turned on (ACC), the navigation system does not activate and sound is not output from the speakers. (w/o Rear Seat Entertainment System) | A |
| Even after the engine switch is turned on (ACC), the navigation system does not activate and sound is not output from the speakers. (w/ Rear Seat Entertainment System) | B |
| The audio system activates when the engine switch is turned on (ACC) but the sound stops being output when the amplifier output exceeds a certain level. | C |
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 engine 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.
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| | GO TO AUDIO AND VISUAL SYSTEM ()
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| 3.CHECK MOST COMMUNICATION CONNECTORS |
Display the "MOST Line Check" screen ().
Check the result on the "MOST Line Check" screen.
Result| Result | Proceed to |
| "NCON" is displayed for "AMP". | A |
| "OK" is displayed for all items. | B |
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| *a | Node position number for devices that use MOST communication |
| *b | Device name |
| *c | Result |
Check the MOST communication line connectors.
Check if the MOST communication line connector between the multi-media module receiver assembly and stereo component amplifier assembly has any connection problems ().
Display the "MOST Line Check" screen and check the result ().
Result| Result | Proceed to |
| "NCON" is displayed for "AMP". | A |
| The screen cannot be changed to the "MOST Line Check" screen. | B |
- When the malfunction in the MOST network is repaired, the screen cannot be changed to the "MOST Line Check" screen.
| | USE SIMULATION METHOD TO CHECK ()
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| 5.CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY WAKE UP LINE) |
Disconnect the stereo component amplifier assembly connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| F85-8 (WUI) - Body ground | Engine switch on (ACC) | 4.5 V or higher |
Text in Illustration| *a | Front view of wire harness connector
(to Stereo Component Amplifier Assembly) |
| OK | |
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| REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY ()
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| 6.CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) |
Disconnect the F84 multi-media module receiver assembly connector.
Disconnect the F85 stereo component amplifier assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| F84-1 (WUO) - F85-8 (WUI) | Always | Below 1 Ω |
| F84-1 (WUO) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 7.CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) |
Disconnect the F84 multi-media module receiver assembly connector.
Disconnect the F85 stereo component amplifier assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| F85-2 (MI+) - F84-5 (MO+) | Always | Below 1 Ω |
| F85-3 (MI-) - F84-6 (MO-) | Always | Below 1 Ω |
| F85-4 (SLDI) - F84-7 (SLDO) | Always | Below 1 Ω |
| F85-5 (MO+) - F84-2 (MI+) | Always | Below 1 Ω |
| F85-6 (MO-)- F84-3 (MI-) | Always | Below 1 Ω |
| F85-7 (SLDO) - F84-4 (SLDI) | Always | Below 1 Ω |
| F85-2 (MI+) - Body ground | Always | 10 kΩ or higher |
| F85-3 (MI-) - Body ground | Always | 10 kΩ or higher |
| F85-4 (SLDI) - Body ground | Always | 10 kΩ or higher |
| F85-5 (MO+) - Body ground | Always | 10 kΩ or higher |
| F85-6 (MO-) - Body ground | Always | 10 kΩ or higher |
| F85-7 (SLDO) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 8.REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY |
Replace the stereo component amplifier assembly with a new or normally functioning one ().
Recheck for DTCs and check if the same DTC is output again ().
| | REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY ()
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| OK | |
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| END (STEREO COMPONENT AMPLIFIER ASSEMBLY IS DEFECTIVE) |
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| 11.MOST COMMUNICATION CONNECTORS |
Display the "MOST Line Check" screen ().
Check the result on the "MOST Line Check" screen.
Result| Result | Proceed to |
| "NCON" is displayed for "AMP". | A |
| "NCON" is displayed for "RSE". | B |
| "OK" is displayed for all items. | C |
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| *a | Node position number for devices that use MOST communication |
| *b | Device name |
| *c | Result |
Check the MOST communication line connectors.
Check if the MOST communication line connector between the multi-media module receiver assembly and stereo component amplifier assembly has any connection problems ().
Display the "MOST Line Check" screen and check the result ().
Result| Result | Proceed to |
| "NCON" is displayed for "AMP". | A |
| The screen cannot be changed to the "MOST Line Check" screen. | B |
- When the malfunction in the MOST network is repaired, the screen cannot be changed to the "MOST Line Check" screen.
| | USE SIMULATION METHOD TO CHECK ()
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| 13.CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY WAKE UP LINE) |
Disconnect the stereo component amplifier assembly connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| F85-8 (WUI) - Body ground | Engine switch on (ACC) | 4.5 V or higher |
Text in Illustration| *a | Front view of wire harness connector
(to Stereo Component Amplifier Assembly) |
| OK | |
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| REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY ()
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| 14.CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) |
Disconnect the F84 multi-media module receiver assembly connector.
Disconnect the F85 stereo component amplifier assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| F84-1 (WUO) - F85-8 (WUI) | Always | Below 1 Ω |
| F84-1 (WUO) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
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| REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY ()
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Check the MOST communication line connectors.
Check if the MOST communication line connector between the multi-media module receiver assembly and stereo component amplifier assembly has any connection problems ().
Display the "MOST Line Check" screen and check the result ().
Result| Result | Proceed to |
| "NCON" is displayed for "RSE". | A |
| The screen cannot be changed to the "MOST Line Check" screen. | B |
- When the malfunction in the MOST network is repaired, the screen cannot be changed to the "MOST Line Check" screen.
| | USE SIMULATION METHOD TO CHECK ()
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| 16.CHECK HARNESS AND CONNECTOR (TELEVISION DISPLAY ASSEMBLY Wake Up LINE) |
Disconnect the television display assembly connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| L56-8 (WUI) - Body ground | Engine switch on (ACC) | 4.5 V or higher |
Text in Illustration| *a | Front view of wire harness connector
(to Television Display Assembly) |
| OK | |
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| REPLACE TELEVISION DISPLAY ASSEMBLY ()
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| 17.CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - TELEVISION DISPLAY ASSEMBLY) |
Disconnect the F85 stereo component amplifier assembly connector.
Disconnect the L56 television display assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| F85-1 (WUO) - L56-8 (WUI) | Always | Below 1 Ω |
| F85-1 (WUO) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
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| REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY ()
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| 18.CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - STEREO COMPONENT AMPLIFIER ASSEMBLY) |
Disconnect the F84 multi-media module receiver assembly connector.
Disconnect the F85 stereo component amplifier assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| F85-2 (MI+) - F84-5 (MO+) | Always | Below 1 Ω |
| F85-3 (MI-) - F84-6 (MO-) | Always | Below 1 Ω |
| F85-4 (SLDI) - F84-7 (SLDO) | Always | Below 1 Ω |
| F85-2 (MI+) - Body ground | Always | 10 kΩ or higher |
| F85-3 (MI-) - Body ground | Always | 10 kΩ or higher |
| F85-4 (SLDI) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 19.CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY - TELEVISION DISPLAY ASSEMBLY) |
Disconnect the F85 stereo component amplifier assembly connector.
Disconnect the L56 television display assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| F85-5 (MO+) - L56-2 (MI+) | Always | Below 1 Ω |
| F85-6 (MO-) - L56-3 (MI-) | Always | Below 1 Ω |
| F85-7 (SLDO) - L56-4 (SLDI) | Always | Below 1 Ω |
| F85-5 (MO+) - Body ground | Always | 10 kΩ or higher |
| F85-6 (MO-) - Body ground | Always | 10 kΩ or higher |
| F85-7 (SLDO) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 20.CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - TELEVISION DISPLAY ASSEMBLY) |
Disconnect the F84 multi-media module receiver assembly connector.
Disconnect the L56 television display assembly connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| F84-2 (MI+) - L56-5 (MO+) | Always | Below 1 Ω |
| F84-3 (MI-) - L56-6 (MO-) | Always | Below 1 Ω |
| F84-4 (SLDI) - L56-7 (SLDO) | Always | Below 1 Ω |
| F84-2 (MI+) - Body ground | Always | 10 kΩ or higher |
| F84-3 (MI-) - Body ground | Always | 10 kΩ or higher |
| F84-4 (SLDI) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 21.REPLACE TELEVISION DISPLAY ASSEMBLY |
Replace the television display assembly with a new or normally functioning one ().
Recheck for DTCs and check if the same DTC is output again ().
| | REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY ()
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| OK | |
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| END (TELEVISION DISPLAY ASSEMBLY IS DEFECTIVE) |
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