Service (Wrench) System Check

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 by the cluster for 2-3 seconds, when the ignition is turned to RUN, for a visual system check.