Question about 1999 Saturn SL

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1999 saturn light with a wrench is on. Disconnected batt. But that didn't work

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Hello. this is a warning indicator. this light is on because there is either a problem with the engine control system, or even possiblity the abs unit. you will need to have the vehicle scanned for trouble codes to see why this light is coming on.

The SERVICE (Wrench) telltale is pulled to ground by the powertrain control module (PCM). When the lamp is pulled to ground, current from the ignition circuit flows through the indicator lamp, allowing it to come ON. The PCM will turn the SERVICE (Wrench) telltale ON for all non-emission related 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 PCM through the class 2 data bus (circuit 1807) 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.

Posted on Jul 04, 2010

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