Maintenance Reminder Control Module: Description and Operation

With the Ignition Switch in the RUN or START position, battery voltage is applied to the Vehicle Maintenance Monitor (VMM) through the MONITOR fuse of the Interior Fuse Panel.

VMM Indicator Module

The VMM is contained on one module. The consists of an Indicator Module is a display that is mounted on the overhead lamp console. Readout signals are displayed on the VMM Indicator Module.

If the VMM receives a signal from a related sensor or switch, the monitor lights the appropriate message to signal the driver of the vehicle condition. The Central Processing Unit (CPU) will also generate a chime when one of the conditions exits. The chime will sound only when the condition is first noted by the VMM.

The VMM receives inputs from the Washer Level Sensor, Engine Coolant Level Sensor, and Fuel Sender or Digital Cluster.

On models equipped with Digital Cluster these functions are performed by the System Scanner.

The VMM monitors the following conditions:

Fuel

When the Fuel Pump/Sender Unit signals low fuel, this indicator will light.

Coolant

This indicator will light when the Coolant Level Switch is closed with a low coolant level. The information is first processed by the Central Processing Unit.

Service

This indicates to the driver that it is time to have the vehicle serviced. The condition is activated by a counter located at the odometer assembly. A cancel switch is located directly above the VMM.

Washer

The Washer Level Sensor closes with low washer fluid levels and supplies a ground to the VMM.

Door Ajar

The Door Jamb Switches signal the VMM through the Central Processing Unit if one of the doors is not securely closed.

Headlamp

The Headlamp Checker informs the VMM of a headlamp outage.

Stop Lamp

The Stop Lamp Checker informs the VMM of a Stop Lamp outage.

Tail Lamp

The Tail Lamp Checker informs the VMM of a Stop Lamp outage.