Indicator and warning lamps (MIU1)

Indicator and warning lamps (MIU 1)

Oil pressure warning lamp

The oil pressure warning lamp is situated in the top right-hand corner of the instrument display. This lamp warns the driver when the engine oil pressure is too low.

The lamp is supplied with power in the main instrument display panel. If the oil pressure drops below 0.3-0.5 bar the oil pressure sensor contacts close and the lamp is grounded.

Charging indicator lamp

The charging indicator lamp is situated in the top right-hand corner of the instrument display. It tells the driver whether the battery is being charged or not.

The lamp is supplied with power in the main instrument display panel and grounded by the generator on pin 11 of the main instrument display panel connector.

If the generator does not rotate or charge the battery for any reason, the indicator lamp circuit will be grounded via the regulator through the generator's field winding, causing the lamp to light up.

When the generator is charging, generator terminals D+ and B+ will both have the same voltage. As a result, both terminals of the indicator lamp receive the same voltage and the lamp goes out.

Connected in parallel with the lamp is a resistor which ensures that the generator receives its magnetizing current when starting even if the lamp bulb is faulty.

A diode is connected in series with the resistor and the lamp. This diode prevents the lamp from lighting up when high charging currents are generated.

EXH warning lamp

A warning lamp for catalytic converter overheating is fitted on cars for certain markets. A voltage is applied to the EXH relay which operates when the temperature of the catalytic converter reaches 825 ± 25°C, causing the warning lamp to be grounded via pin 12 (12p-2) of the main instrument display panel connector.

The lamp will then remain alight until the temperature drops by about 10°C. When the ignition is switched on the lamp is tested for about 3 seconds. If the temperature is within normal limits the lamp will go out.

Airbag warning lamp

Below the SRS symbol in the main instrument display panel are either two lamp bulbs (M1994) or one lamp bulb (M1995).

Should a fault develop in the system, both SRS lamp bulbs will start to flash. They will continue to flash for 5 minutes and then stay on without flashing. If the system has been activated, i.e firing current has been sent to the explosive charges in the gas generators, both lamp bulbs will flash continuously.

The SRS 2 bulb is supplied with +15 power via pin 8 of the main instrument display panel and grounded by the airbag control module via pin 8 (12p-2) of the main instrument display panel.

M1994 only: The SRS 1 bulb is supplied with power from fuse 18 via pin 10 of the main instrument display panel connector and grounded from the airbag control module via pin 9 of the main instrument display panel.

Both lamps light up for about 3 seconds when the ignition is switched on. If there are no faults in the system the lamps will then go out.

Warning lamp, brake fluid level

The brake fluid warning lamp tells the driver when the level of the fluid in the reservoir is too low.

The lamp is supplied with power in the main instrument display panel.

The brake fluid level sensor grounds the lamp if the level in the reservoir drops too low.

When the ignition is switched on the generator grounds the charging lamp and brake fluid warning lamp via a diode to check the operation of the systems.

Handbrake warning lamp

The handbrake warning lamp is situated in the right-hand part of the instrument display. This lamp lights up to tell the driver that the handbrake is on.

The lamp is supplied with power in the main instrument display panel.

The warning lamp is grounded as long as the handbrake is applied, causing the lamp to light up.

ABS warning lamp

The ABS control module monitors the operation of the anti-lock braking system and causes the ABS warning lamp to light up if a fault is detected. The ABS warning lamp is situated in the right-hand part of the main instrument display panel. On M1994 and later cars the words "ANTI LOCK" are replaced by an ABS symbol. 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 power in the main instrument display panel and grounded from the ABS control module via pin 7 of the main instrument display panel. When the ignition is switched on the lamp is tested for about 3 seconds. If no fault is detected the lamp will go out.

SPORT mode indicator lamp

On cars equipped with a TCM (Transmission Control Module), i.e. electronically controlled automatic transmission, the indicator lamp lights up when the SPORT button on the selector lever is pressed.

In SPORT mode, the transmission remains longer in the gears. The transmission stays in SPORT mode until the SPORT button is pressed once again, the ignition is switched off or WINTER mode is engaged.

The lamp is supplied with power in the main instrument display panel and grounded in the TCM control module via pin 5 of the main instrument display panel.

When the ignition is switched on the lamp is tested for about 3 seconds. If no fault is detected the lamp will go out.

WINTER mode indicator lamp

To facilitate starting on slippery road surfaces, the TCM transmission has a WINTER mode, i.e. the car starts in 3rd gear when the WINTER button (snowflake) on the selector lever is pressed.

The WINTER mode will be disengaged by pressing the WINTER button once again, switching off the ignition, when in limp-home mode or if speed exceeds about 80 km/ h.

The lamp is supplied with power in the main instrument display panel and grounded in the TCM control module via pin 4 of the main instrument display panel.

When the ignition is switched on the lamp is tested for about 3 seconds. If no fault is detected the lamp will go out.

CHECK GEARBOX warning lamp

If a fault develops in the automatic transmission, the CHECK GEARBOX warming lamp in the main instrument display panel will light up.

The lamp is supplied with power in the main instrument display panel and grounded in the TCM control module via pin 1 of the main instrument display panel.

When the ignition is switched on the lamp is tested for about 3 seconds. If no fault is detected the lamp will go out.

Low fuel indicator lamp

Information is given under "Fuel gauge".

CHECK ENGINE warning lamp (MIL)

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

The lamp is supplied with power in the main instrument display panel and grounded by the engine management system.

When the ignition is switched on the lamp is tested for about 3 seconds. If no fault is detected the lamp will go out.

Direction indicator repeater lamps

The repeater lamps are situated in the upper part of the main instrument display panel. They are supplied with power from ICE module pins 2 and 14 and grounded in the main instrument display panel.

The lamps are connected in parallel with the direction indicators on the appropriate side of the car.

CRUISE indicator lamp

The main instrument display panel contains a CRUISE indicator lamp which lights up when Cruise Control is engaged.

The lamp is supplied with power from the Cruise Control system's control module via pin 2 of the main instrument display panel and grounded in the main instrument display panel.

In the TIP position, however, the lamp goes out as acknowledgement that TIP mode has been selected.

The CRUISE indicator lamp is also used in diagnostics mode to provide information about the system.

Lights indicator lamp

Cars for some markets are fitted with an indicator lamp which shows when the lights are switched on.

The indicator lamp is supplied with power from the lights switch via pin 1 of the main instrument display panel and grounded in the main instrument display panel.

Indicator lamp, rear fog light

The rear fog light indicator lamp is situated in the top left-hand corner of the instrument display panel. It tells the driver that the rear fog light is switched on.

The indicator lamp is supplied with power via pin 12 and grounded in the main instrument display panel.

Main beam indicator lamp

The indicator lamp is situated in the top left-hand corner of the instrument display panel and tells the driver when the headlamps are on main beam.

The lamp is supplied with power from main beam fuse 3 via pin 13 of the main instrument display panel and grounded in the main instrument display panel.

"Faulty bulb" indicator lamp

If a bulb at the rear is faulty, the ICE module sends a message to the SID unit which grounds the "FAULTY BULB" lamp in the main instrument display panel.

If a bulb at the front is faulty, the filament monitor grounds the indicator lamp in the main instrument display panel via the SID unit.

The lamp is supplied with power in the main instrument display panel.

"Door open" indicator lamp

The indicator lamp is supplied with power in the main instrument display panel. The ICE module grounds it via pin 10 of the main instrument display panel on receiving information that a door is open.

Connected in series with the indicator lamp is a diode which prevents the lamp from lighting up incorrectly.

Low washer fluid indicator lamp

On M1994 and later cars main instrument display panel 1 is equipped with an indicator lamp for low washer fluid level.

The low washer fluid lamp lights up when there is less than 1.4 litres of fluid remaining in the reservoir.

The level switch in the fluid reservoir is connected to the SID unit. When the fluid drops below a certain level, the SID unit grounds the indicator lamp via pin 5 (white 12-p) of the main instrument display panel.