Abstract: The invention concerns a device (1) for measuring at least one parameter of a motor vehicle, the device (1) comprising at least one reference resistor (R0) of a predetermined value and at least two measuring branches (K1, K2), each of the two measuring branches comprising at least a first element comprising a resistor (R0) or a resistive sensor (R2), capable of being connected to a voltage supply (Vcc), and a second element comprising a resistor or a resistive sensor (R1, R3) capable of being connected to earth (M), the first element and the second element being connected together at a mid-point (A, B), the mid-points (A, B) of the at least two measuring branches (K1, K2) being connected together in pairs by a third element comprising a resistor or a resistive sensor (R4).

Abstract: The invention concerns a device (1) for measuring at least one parameter of a motor vehicle, the device (1) comprising at least one reference resistor (R0) of a predetermined value and at least two measuring branches (K1, K2), each of the two measuring branches comprising at least a first element comprising a resistor (R0) or a resistive sensor (R2), capable of being connected to a voltage supply (Vcc), and a second element comprising a resistor or a resistive sensor (R1, R3) capable of being connected to earth (M), the first element and the second element being connected together at a mid-point (A, B), the mid-points (A, B) of the at least two measuring branches (K1, K2) being connected together in pairs by a third element comprising a resistor or a resistive sensor (R4).

Abstract: A method for diagnosing the status of a communication link between an interior relay antenna and an exterior relay antenna of a motor vehicle. The method includes measuring a first voltage value defined between the midpoint of the electrical circuit and the second ground when the switch is in the open position, measuring a second voltage value defined between the midpoint of the electrical circuit and the second ground when the switch is in the closed position, calculating the value of the variable resistor from the first measured voltage value, from the second measured voltage value, from the value of the voltage defined across the terminals of the voltage source and from the values of the first resistor and of the second resistor, and diagnosing the status of the communication link on the basis of the calculated value of the variable resistor.

Abstract: A method for diagnosing the status of a communication link between an interior relay antenna and an exterior relay antenna of a motor vehicle. The method includes measuring a first voltage value defined between the midpoint of the electrical circuit and the second ground when the switch is in the open position, measuring a second voltage value defined between the midpoint of the electrical circuit and the second ground when the switch is in the closed position, calculating the value of the variable resistor from the first measured voltage value, from the second measured voltage value, from the value of the voltage defined across the terminals of the voltage source and from the values of the first resistor and of the second resistor, and diagnosing the status of the communication link on the basis of the calculated value of the variable resistor.