Service (Wrench) Telltale

The SERVICE (Wrench) telltale is turned On by the cluster when it receives a command from the PCM or the BCM. The PCM or BCM will turn the SERVICE (Wrench) telltale On for all non-emission related diagnostic trouble codes (DTCs) that require that a telltale be turned On (some DTCs do not turn on a telltale but are stored to aid in diagnosis).

The SERVICE (Wrench) telltale will also be turned On if the ABS control module has detected a fault in its own warning indicator system. If the ABS system cannot turn on its own telltale, a message will be sent to the BCM through the Key Word 2000 data bus to turn on the SERVICE (Wrench) telltale.

The SERVICE (Wrench) telltale will be turned On for 2-3 Seconds when the ignition is turned to RUN for a bulb test.