Warning and indicator lamps, Trionic T7

Warning and indicator lamps, Trionic T7

The INFO DISPL lamp lights up when a message is displayed on the SID unit. The lamp is supplied with current (+15 circuit) from the main instrument unit and grounded by the MIU's control module. The SID unit continuously sends bus information INFO DISPL, unit ON/OFF.

On receiving INFO DISPL ON, the control module grounds the output for the lamp which then lights up.

The main instrument unit lights this lamp for 3 seconds when the ignition is switched on.

Diagnostics

The function has no diagnostics.

Central warning lamp

The central warning lamp lights up when a fault occurs in a system having to do with the car's safety.

The lamp is supplied with current (+15 circuit) from the main instrument unit and grounded by the MIU's control module when one of the following warning or indicator lamps lights up:

•	Warning lamp, AIRBAG

•	Engine oil pressure warning lamp

•	Warning lamp, charging

•	Warning lamp, brake fluid level

•	Warning lamp, handbrake

•	ABS warning lamp

The handbrake lamp lights the central warning lamp if the speed passes 5 km/h from a speed below 5 km/h.

Common to the above lamps is that they are supplied with current (+15 circuit) in the main instrument unit and grounded through the relevant component/system.

The central warning lamp also lights up when:

•	Coolant temperature exceeds 129°C

At the same time as the central warning lamp lights up, the main instrument unit sends bus information to the SID unit requesting it to activate an acoustic signal. This does not occur when the ignition is switched on as the lamps are then only tested. An engine speed of above 310 rpm is required for this request.

Diagnostics

The function has no diagnostics.

Engine oil pressure warning lamp

The oil pressure warning lamp is located in the top right-hand corner. It warns the driver when engine oil pressure is too low.

The lamp is supplied with current in the main instrument unit and grounded via terminal 2 (K20) of the oil pressure sensor.

If the oil pressure is below 0.3-0.5 bar, the oil pressure sensor contacts close, the circuit is grounded and the lamp lights up. At the same time the central warning lamp lights up and, at engine speeds above 310 rpm, the MIU sends a request to the SID unit for activation of an acoustic signal.

Diagnostics

The function has no diagnostics.

Warning lamp, charging

The charging warning lamp is located in the top right-hand corner and informs the driver whether the generator is charging or not.

The lamp is supplied with current in the main instrument unit and grounded by the generator via terminal 3 (K20).

If the generator does not rotate or charge for any reason, the indicator lamp circuit is grounded via the regulator through the generator's field winding, causing the lamp to light up. At the same time the central warning lamp lights up and, at engine speeds above 310 rpm, the MIU sends a request to the SID unit for activation of an acoustic signal.

When the generator is charging, its D+ and B+ terminals will have the same voltage. Both terminals of the warning lamp will then be supplied with this same voltage and the lamp goes out.

A resistor is connected in parallel with the lamp. This resistor ensures that magnetizing current is supplied to the generator on starting even if the lamp is faulty.

A diode is connected in series with the resistor/lamp. This diode prevents the lamp from glowing at high charging voltages.

Diagnostics

The function has no diagnostics.

Warning lamp, AIRBAG

The AIRBAG warning lamp is located in the right-hand part of the main instrument unit. This lamp informs the driver when a fault occurs in the Airbag system. The central warning lamp serves as a second airbag warning lamp and does not go out until all its warning inputs are normal.

The AIRBAG warning lamp is supplied with current (+15 circuit) in the main instrument unit via pin 1 (K20) of the Airbag control module.

Should a fault arise in the system, the AIRBAG Warning lamp and central warning lamp light up continuously and at engine speeds above 310 rpm the MIU sends a request to the SID unit for activation of an acoustic signal.

If the Airbag system has been activated – sent detonating current to the explosive charges in the gas generators – the AIRBAG Warning lamp and central warning lamp will light up and stay on.

The airbag control module lights the lamp when the ignition is turned on. If there are no faults, the lamp will go out after about 3 seconds.

Diagnostics

An open circuit/short circuit sets a diagnostic trouble code in the Airbag control module.

Warning lamp, brake fluid level

The brake fluid level warning lamp is located in the right-hand part of the main instrument unit. It warns the driver if the level in the brake fluid reservoir is too low. It also comes on if a fault develops in the anti-lock brake system (ABS).

The lamp is supplied with current in the main instrument unit and grounded via terminal 12 (K20) of the brake fluid reservoir.

If the level is too low the central warning lamp also lights up and, at engine speeds above 310 rpm, the MIU sends a request to the SID unit for activation of an acoustic signal

The main instrument unit lights the brake fluid level warning lamp for 3 seconds when the ignition is turned on.

Diagnostics

The function has no diagnostics.

Warning lamp, handbrake

The handbrake warning lamp is located in the right-hand part of the main instrument unit. It comes on to inform the driver that the handbrake is applied.

The lamp is supplied with current in the main instrument unit. As long as the handbrake remains applied, the switch operated by the handbrake lever grounds the lamp via terminal 11 (K20), causing it to light up.

If the vehicle speed passes 5 km/h from a speed below 5 km/h while the handbrake is applied, the central warning lamp will also light up and the MIU will send a request to the SID unit for activation of an acoustic signal.

Diagnostics

The function has no diagnostics.

ABS warning lamp

The ABS control module monitors the function of the ABS system and in the event of a fault lights the ABS warning lamp, which is situated on the right-hand side of the main instrument unit.

When the ABS lamp lights up, the anti-lock braking system is disabled and the brakes work just like a conventional braking system.

The lamp is supplied with current in the main instrument unit and grounded via main instrument unit terminal 10 (K20) in the ABS control module.

The ABS control module lights the lamp when the ignition is switched on and if there is no fault it will go out after approx. 3 seconds.

When the ABS warning lamp lights up, the brake fluid warning lamp and central warning lamp will also light up.

Diagnostics

The function has no diagnostics.

Fuel reserve indicator lamp

When there is only about 10 litres of fuel remaining in the tank a lamp comes on to indicate low fuel level. The lamp is supplied with current in the main instrument unit and when it should light up it is grounded by the main instrument unit's control module.

The main instrument unit lights the lamp for 3 seconds when the ignition is switched on.

Diagnostics

An open circuit/short circuit sets diagnostic trouble code B1720. The gauge needle indicates 0 litres and the fuel reserve indicator lamp lights up.

CHECK ENGINE indicator lamp

The CHECK ENGINE lamp (MIL) warns the driver when a fault occurs in the engine management system.

The lamp is supplied with current in the main instrument unit and grounded by the MIU's control module. The Trionic T7 continuously sends bus information CHECK ENGINE, unit ON/OFF.

On receiving CHECK ENGINE ON, the control module grounds the output of the lamp, which then lights up.

On cars for certain markets the TCM lights the CHECK ENGINE lamp.

If the Trionic changes the status of the message to CHECK ENGINE OFF, the lamp will go out.

With the ignition ON the lamp remains on until the engine starts. If there are no faults, the Trionic T7 sends bus information CHECK ENGINE OFF and the lamp will go out.

Diagnostics

The function has no diagnostics.

Direction indicator repeater lamps RH and LH

The repeater lamps are situated in the upper part of the main instrument unit and show when the direction indicators are on.

The lamps are supplied with current in the main instrument unit and grounded by the MIU's control module. DICE continuously sends bus information on the status of DIRECTION INDICATORS RIGHT and DIRECTION INDICATORS LEFT, unit ON/OFF.

On receiving DIRECTION INDICATORS ON, the control module grounds the output of the lamp in question which then lights up.

Example

If the LH direction indicators are activated, DICE will change the status of the information DIRECTION INDICATORS LEFT ON/OFF at the same time as the direction indicator lamps are lit. In this way, the main instrument unit control module can synchronize the flashing of the repeater lamps with the direction indicator lamps.

The SID also activates the TIC-TAC sound at the same time as the lamps flash.

The function is the same for the RH direction indicators.

Hazard flashers

The hazard flashers function is the same as for direction indicators Left/Right except that both lamps are activated at the same time.

When the hazard flashers are activated and the ignition is OFF, the indicator lamps will not flash.

Diagnostics

The function has no diagnostics.

Cruise indicator lamp

The CRUISE indicator lamp is located in the left-hand part of the main instrument unit. It comes on when the cruise control system is engaged.

The lamp is supplied with current in the main instrument unit and grounded by the MIU's control module. The Trionic T7 continuously sends bus information CRUISE Lamp, unit ON/OFF.

On receiving CRUISE Lamp ON, the control module grounds the output of the lamp which then lights up. If the cruise control system is turned off, the Trionic T7 changes the status of the information to CRUISE Lamp OFF and the lamp goes out.

Diagnostics

The function has its own diagnostics in the sending system.

SHIFT UP indicator lamp

To achieve low fuel consumption, the SHIFT UP indicator lamp in the main instrument unit comes on when a higher gear should be engaged (certain markets).

The lamps are supplied with current in the main instrument unit and grounded by the MIU's control module. The Trionic T7 continuously sends bus information SHIFT-UP, unit ON/OFF.

On receiving SHIFT-UP, the control module grounds the output of the lamp which then lights up.

If upshifting has been performed, the Trionic T7 changes the status of the information to SHIFT-UP OFF and the lamp goes out.

Diagnostics

The function has its own diagnostics in the sending system.

Lights-on indicator lamp

An indicator lamp shows when the headlamps are switched on. The lamp is situated below the speedometer.

The indicator lamp is supplied with current from the lights switch on pin 9 (K20) of the main instrument unit and is grounded in the main instrument unit.

Diagnostics

The function has no diagnostics.

Indicator lamp, rear fog light

The indicator lamp for the rear fog light is situated in the upper right-hand corner and informs the driver when the rear fog light is switched on.

The lamp is supplied with current in the main instrument unit and grounded by the MIU's control module. DICE continuously sends bus information REAR FOG LIGHT, unit ON/OFF.

On receiving REAR FOG LIGHT ON, the control module grounds the output of the lamp which then lights up.

If DICE changes the status of the bus information to REAR FOG LIGHT OFF, the lamp goes out.

Diagnostics

The function has its own diagnostics in the sending system.

Main beam indicator lamp

The indicator lamp is situated in the upper left-hand corner and informs the driver that main beams are switched on.

The lamp is supplied with current from main beam fuse 8 on pin 15 (K20) of the main instrument unit and is grounded in the main instrument unit.

Diagnostics

The function has no diagnostics.

Door indication

Door indication (on the pictogram) informs the driver if any of the doors or the tailgate is open. It consists of five red LEDs and a lamp. The doors and the tailgate each have an LED. The car is indicated in orange by a lamp.

The LEDs and the lamp are supplied with current in the main instrument unit and grounded by the main instrument unit control module.

TWICE continuously sends bus information on the status of the doors and tailgate, unit OPEN/CLOSED.

Example

When the driver's door is open and the other doors and tailgate are closed, the following information is sent:

Driver's door		Open
Passenger's door		Closed
Rear door LH		Closed
Rear door RH		Closed
Tailgate		Closed

The main instrument unit control module grounds the outputs of the symbols for the driver's door and the car, which then light up. The other LEDs remain off. The car symbol always lights up if a door or the tailgate is open.

Diagnostics

The function has no diagnostics.