In the event of a fault, the internal connections of the device must be checked in all operating conditions. To do this, disconnect the switch connector from the main wiring harness (Sect. P 1, Routing of wiring on frame).

Test the device using either an analogue or digital multimeter (Sect. P 9, Diagnostic instruments).

The same checks can also be performed using the “DDS” tester (Sect. D 5, DDS tester).

The colours mentioned in the following descriptions refer to the colours of the wires from the switch and not to the colours of the wires of the main electrical system.

Connect the terminals of a multimeter to the red/blue and and blue/white wires to check for electrical continuity, which must be present when the HORN is pressed (see Sect. P 9, Diagnostic instruments, concerning operation of the multimeter). When the horn button is pressed, the resistance value shown by the multimeter should be close to zero and, if available, a continuity beep should be heard. When the horn button is not pressed, the resistance value should be infinity (there is no continuity as the electrical contacts inside the pushbutton are open) and no continuity beep should be heard. If these conditions are not met, the device must be replaced.

Connect the multimeter to the grey and red/blue wires from the turn signal switch and check for electrical continuity when operating the right turn signals (see Sect. P 9, Diagnostic instruments concerning operation of the multimeter). Repeat the above procedure for the left turn signal, but connect the multimeter to the black and grey wires. The above colours refer to the colour of wires from the switch and not to the colour of wires of the main electrical system.

set down pushbutton

set up pushbutton

Refit the left-hand handlebar switch and tighten the bolts (1) to the specified torque (Sect. C 3, Frame torque settings).

To remove the right-hand handlebar switch, undo the retaining bolts (1) and disconnect the wiring connector from the electrical system.

The colours mentioned in the following descriptions refer to the colours of the wires from the switch and not to the colours of the wires of the main electrical system.

Using a multimeter, check for continuity between the Red/Black and Red/White wires (see Sect. P 9, Diagnostic instruments for information on the operation of the multimeter). When the button is in RUN position, there should be electrical continuity between the two wires. When the button is in the OFF position, there should be no electrical continuity between the two wires.

If these conditions are not met, the engine stop switch is not working correctly and must be renewed. The colours indicated above refer to the colour of wires coming from the switch and not to the colour of wires of the main electrical system.

Proceed as described for the engine stop button and check for continuity between the blue/white and black wires when the starter button is pressed (see Sect. P 9, Diagnostic instruments concerning operation of the multimeter). If there is no continuity, the starter button is faulty and must be renewed. The colours indicated above refer to the colour of wires coming from the switch and not to the colour of wires of the main electrical system.

Refit the left-hand handlebar switch and tighten the bolts (1) to the specified torque (Sect. C 3, Frame torque settings).

To check operation of the front (1) and rear (2) brake light switches, use a multimeter to check for electrical continuity (Pos. A) between the terminals of the corresponding switch when the front or rear brake is applied (see Sect. P 9, Diagnostic instruments on operation of the multimeter). When the brake is released, there must be no electrical continuity between the terminals of the corresponding switch (Pos. B). If these tests fail to produce positive results, the part in question must be renewed.

Remove the electric terminal connected to the neutral switch. Switch on the ignition switch (ignition key to ON position) and ensure that the light illuminates when the terminal is earthed. If the light switches on, the neutral light switch should be changed. If the light stays off, switch off the ignition (ignition key set to OFF) to switch off the instrument panel and check for electrical continuity between the neutral switch and the engine control unit with a multimeter.

Switch on the ignition (ignition key set to ON) and remove the electrical terminal from the neutral switch. If the light switches off, the neutral light switch should be changed. If the light stays off, switch off the ignition (ignition key set to OFF) and use a multimeter to check that the section of circuit between neutral switch and engine ECU is not earthed.

Use the DDS tester to check that the oil pressure in the engine oil circuit complies with the specified values (Sect. D 5, Checking the engine oil pressure).

If engine oil pressure value is within the allowed operating range and the “low engine oil pressure” warning light on the instrument panel stays off, switch on the instrument panel (ignition key set to ON) without starting the engine, and disconnect the electrical terminal from the pressure sensor and connect it to earth. If the warning light now illuminates, this means the sensor is defective and must be replaced. If the indicator light fails to illuminate, use a multimeter and check for electrical continuity in the section of the circuit between sensor and warning light on the instrument panel (this check must be performed with the ignition key set to OFF, i.e. with instrument panel off).

If the engine oil pressure is within the specified range and the “engine oil pressure low” warning light on the instrument panel is continuously illuminated, switch on the instrument panel (ignition key set to ON) and start the engine, then disconnect the electrical terminal normally inserted on the pressure sensor. If the warning light now switches off, this means the sensor is defective. If the warning light fails to switch off use a multimeter and check that the section of the circuit between sensor and warning light on the instrument panel is not connected to earth (this check must be performed with the ignition key set to OFF, i.e. instrument panel off).

For the clutch switch (5), proceed in the same manner as for the brake light switches (see the beginning of this paragraph).

The bulb (3) is of the bayonet-type: press and twist anti-clockwise to remove. Replace the burned out bulb with a new one of the same type. Press the bulb in and twist clockwise until it clicks into place.

The front turn signals (1) are integrated in the hand guard assembly (Sect. E 1, Removal of the hand guards - rearview mirrors) and in the event of malfunction, the mirror/turn signal assembly must be renewed as a complete unit.