Service (Wrench) Telltale

The SERVICE (Wrench) telltale is turned On by the cluster when it receives a command from the PCM, BCM, or the EBTCM. 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 EBTCM 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 to cluster 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.