DTC B1543: Extension Module Disconnected 2 [12/2019 - 10/2022]: Description
If the radio receiver assembly cannot detect the navigation ECU for a certain period of time (90 seconds) after the ignition switch is turned to ACC and the radio receiver assembly confirms that the information is missing by checking past navigation ECU recognition information (registered information), this DTC will be stored.
HINT:
The navigation system uses USB communication between devices. If an open, short, short to +B or short to ground occurs in the USB circuit, communication is interrupted and the navigation system will not operate normally.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area |
|---|---|---|---|
| B1543 | Extension Module Disconnected 2 | Navigation ECU disconnected |
|
- *: w/ Stop and Start System
HINT:
This DTC may be stored due to environmental reasons such as electrical noise or interference.