Toyota Avalon (XX50): AVC-LAN Circuit. Stereo Component Amplifier Malfunction (B15A3). GPS Antenna Connection Malfunction(short) (B15C0,B15C1)
AVC-LAN Circuit
DESCRIPTION
Each unit of
the audio and visual system connected to the AVC-LAN (communication bus)
transmits signals via AVC-LAN communication.
If
a short to +B or short to ground occurs in an AVC-LAN communication
line, the audio and visual system will not function normally because
communication is not possible.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Depending on the parts that are replaced during vehicle inspection or
maintenance, performing initialization, registration or calibration may
be needed. Refer to Precaution for Audio and Visual System.
Click here 
- When replacing the radio and display receiver assembly, always replace
it with a new one. If a radio and display receiver assembly which was
installed to another vehicle is used, the following may occur:
- A communication malfunction DTC may be stored.
- The radio and display receiver assembly may not operate normally.
HINT:
The radio and display receiver assembly is the master unit.
PROCEDURE
| 1. |
INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY |
(a) Remove the radio and display receiver assembly.
| (b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
G3-5 (TX1+) - G3-6 (TX1-) |
Always | 60 to 80 Ω | |
 |
|
*a | Component without harness connected
(Radio and Display Receiver Assembly) | | |
| NG |
 | REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY |
|
OK |
 | |
| 2. |
CHECK HARNESS AND CONNECTOR (AVC-LAN CIRCUIT) |
(a) Disconnect the G3 radio and display receiver assembly connector.
(b) Disconnect the G8 stereo component amplifier assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|
G8-8 (TX+) - G3-5 (TX1+) |
Always | Below 1 Ω |
|
G8-7 (TX-) - G3-6 (TX1-) |
Always | Below 1 Ω |
|
G8-8 (TX+) or G3-5 (TX1+) - Body ground |
Always | 10 kΩ or higher |
|
G8-7 (TX-) or G3-6 (TX1-) - Body ground |
Always | 10 kΩ or higher |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
OK | |
| |
| 3. |
INSPECT MALFUNCTIONING PARTS |
(a) Disconnect and reconnect each slave unit one by one until the master unit returns to normal.
HINT:
- Check all slave units.
- If disconnecting a slave unit causes the master unit to return to normal, the slave unit is defective and should be replaced.
OK:
Master unit returns to normal.
| OK |
| REPLACE MALFUNCTIONING PARTS |
| NG |
| REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY |
Stereo Component Amplifier Malfunction (B15A3)
DESCRIPTION
This DTC is stored when a malfunction occurs in the stereo component amplifier assembly.
|
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
|
B15A3 | Stereo Component Amplifier Malfunction |
When any of the following conditions is met:
- Internal power supply malfunction
- DSP error
- EEPROM error
| Stereo component amplifier assembly |
PROCEDURE
(a) Clear the DTCs.
Body Electrical > Navigation System > Clear DTCs
(b) Recheck for DTCs and check that no DTCs are output.
Body Electrical > Navigation System > Trouble Codes
OK:
No DTCs are output.
| OK |  |
USE SIMULATION METHOD TO CHECK |
| NG |
| REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY |
GPS Antenna Connection Malfunction(short) (B15C0,B15C1)
DESCRIPTION
These DTCs are stored when a malfunction occurs in the navigation antenna assembly.
|
DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
|
B15C0 | GPS Antenna Connection Malfunction(short) |
Navigation antenna malfunction |
- Navigation antenna assembly
- No. 4 antenna cord sub-assembly
- No. 5 antenna cord sub-assembly
- Radio and display receiver assembly
|
| B15C1 |
GPS Antenna Connection Malfunction(break) |
Navigation antenna power source malfunction |
- Navigation antenna assembly
- No. 4 antenna cord sub-assembly
- No. 5 antenna cord sub-assembly
- Radio and display receiver assembly
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
- Depending on the parts that are replaced during vehicle inspection or
maintenance, performing initialization, registration or calibration may
be needed. Refer to Precaution for Audio and Visual System.
Click here 
- When replacing the radio and display receiver assembly, always replace
it with a new one. If a radio and display receiver assembly which was
installed to another vehicle is used, the following may occur:
- A communication malfunction DTC may be stored.
- The radio and display receiver assembly may not operate normally.
- Check that the No. 4 antenna cord sub-assembly and No. 5 antenna cord
sub-assembly is properly installed and does not have any sharp bends,
pinching or loose connections before performing following procedure.
Click here
PROCEDURE
(a) Clear the DTCs.
Body Electrical > Navigation System > Clear DTCs
(b) Recheck for DTCs and check that no DTCs are output.
Body Electrical > Navigation System > Trouble Codes
OK:
No DTCs are output.
| OK |  |
USE SIMULATION METHOD TO CHECK |
|
NG |
 | |
| 2. |
INSPECT NO. 5 ANTENNA CORD SUB-ASSEMBLY |
(a) Remove the No. 5 antenna cord sub-assembly.
Click here
| (b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
C-1 - D-1 | Always |
Below 1 Ω | |
C-1a - D-1a | Always |
Below 1 Ω | |
C-1 or D-1 - Body ground |
Always | 10 kΩ or higher | |
 |
|
*a | Component without harness connected
(No. 5 Antenna Cord Sub-assembly) | | |
| NG |
| REPLACE NO. 5 ANTENNA CORD SUB-ASSEMBLY |
|
OK | |
| |
| 3. |
INSPECT NO. 4 ANTENNA CORD SUB-ASSEMBLY |
(a) Remove the No. 4 antenna cord sub-assembly.
Click here
| (b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
A-3 - B-1 | Always |
Below 1 Ω | |
A-3a - B-1a | Always |
Below 1 Ω | |
A-3 or B-1 - Body ground |
Always | 10 kΩ or higher | |
 |
|
*a | Component without harness connected
(No. 4 Antenna Cord Sub-assembly) | | |
| NG |
| REPLACE NO. 4 ANTENNA CORD SUB-ASSEMBLY |
|
OK | |
| |
| 4. |
INSPECT NAVIGATION ANTENNA ASSEMBLY |
(a) Remove the navigation antenna assembly.
Click here
| (b) Measure the resistance according to the value(s) in the table below.
Standard Resistance: |
Tester Connection | Condition |
Specified Condition | |
3 - 3a | Always |
50 to 500 Ω | |
 |
|
*a | Component without harness connected
(Navigation Antenna Assembly) | | |
| OK |
| REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY |
| NG |
| REPLACE NAVIGATION ANTENNA ASSEMBLY |
