Saturn

SERVICE (WRENCH) TELLTALE

The SERVICE (Wrench) telltale is turned On by the cluster when it receives a command from the Powertrain Control Module (PCM), Body Control Module (BCM), or the Electronic Brake Traction Control Module (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 Antilock Braking System (ABS) system cannot turn on its own telltale, a message will be sent to the cluster to turn on the SERVICE (Wrench) telltale.
The SERVICE (Wrench) telltale will be displayed for 2-3 seconds during startup for bulb check purposes.