DESCRIPTION
Each unit of the navigation system connected to the AVC-LAN (communication bus) transmits switch signals via AVC-LAN communication.
If a short to +B or short to ground occurs in the AVC-LAN, the navigation system will not function normally because communication is not possible.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
HINT:
The navigation receiver assembly is the master unit.
PROCEDURE
1. |
INSPECT NAVIGATION RECEIVER ASSEMBLY |
(a) Remove the navigation receiver assembly (See page
|
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
7 (TX1+) - 8 (TX1-) |
Always |
60 to 80 Ω |
*a |
Component without harness connected (Navigation Receiver Assembly) |
NG | ![]() |
REPLACE NAVIGATION RECEIVER ASSEMBLY |
|
2. |
CHECK HARNESS AND CONNECTOR (AVC-LAN CIRCUIT) |
(a) Disconnect the E40 navigation receiver assembly connector.
(b) Disconnect the E14 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 |
---|---|---|
E14-8 (TX+) - E40-7 (TX1+) |
Always |
Below 1 Ω |
E14-7 (TX-) - E40-8 (TX1-) |
Always |
Below 1 Ω |
E14-8 (TX+) - Body ground |
Always |
10 kΩ or higher |
E14-7 (TX-) - Body ground |
Always |
10 kΩ or higher |
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
INSPECT MALFUNCTIONING PARTS |
(a) Disconnect and reconnect each slave unit one by one until the master unit returns to normal.
HINT:
OK:
Master unit returns to normal.
OK | ![]() |
REPLACE MALFUNCTIONING PARTS |
NG | ![]() |
REPLACE NAVIGATION RECEIVER ASSEMBLY |
Diagnosis System
DIAGNOSIS SYSTEM
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