General Testing - Digital Cluster

Gauge failures are often caused by defective wiring or grounds. The first step in locating trouble should be a thorough inspection of all wiring, terminals and printed circuits. If wiring is secured by clamps, check to see whether the insulation has been severed thereby grounding the wire. In the case of a fuel gauge installation, rust may cause failure by corrosion at the ground connection of the tank unit.


CAUTION: Service of the instrument cluster is limited to replacement of the indicator and illumination bulbs, and removal/replacement of the non-volatile odometer memory module (if the digital cluster is sent in for repairs). If the digital cluster is sent in for repairs, check with the repair facility for a list of the items that must be removed prior to sending the unit in for repairs.

When replaceing a speedometer or odometer assembly, the law requires that the odometer reading of the replacement unit to be set to register the same milage as the prior odometer. Check with state laws to insure proper compliance.

See the circuit referred to for the complete operation of an indicator and the other components that work with it. Only the indicators that do not appear in other schematics are described in this section.