The multi-display performs switch operation control during driving by receiving a vehicle speed signal from the combination meter.

Each unit of the navigation system connected to the AVC-LAN (communication bus) transfers the signal of each switch by communication.

When a short to +B or short to ground occurs in this AVC-LAN, the navigation system will not function normally as the communication is discontinued.

This circuit is from the parking brake switch to the multi-display.

Power is supplied to the multi-display and steering pad switch assembly illumination when the light control switch is in the TAIL or HEAD position.

This circuit sends an operation signal from the steering pad switch to the radio receiver.

If there is an open in the circuit, the navigation system cannot be operated using the steering pad switch.

If there is a short in the circuit, the resulting condition is the same as if the switch were continuously depressed. Therefore, the navigation system cannot be operated using the steering pad switch, and the navigation system itself cannot function.

The navigation ECU receives a vehicle speed signal from the multi-display and information about the GPS antenna, and then adjusts vehicle position.

Turn the audio system off and move the vehicle to a location where radio wave reception is possible.

Check if the other side can hear your voice properly.

Check if the voice on the other side can be heard using a cellular phone.

Check if the cellular phone can make calls in a certain place.