Service Vehicle Soon (SVS) Lamp Always on [12,000 lbs GVW]

Service Vehicle Soon (SVS) Lamp Always On [12,000 lbs GVW]

Description
Battery positive voltage is supplied directly to the Service Vehicle Soon (SVS) Lamp. The engine control module (ECM) turns the MIL ON by grounding the SVS lamp control circuit.

SVS Lamp Operation
The SVS lamp is located on the instrument panel cluster (IPC).

SVS Lamp Function
- The SVS lamp informs the driver that a malfunction has occurred and the vehicle should be taken in for service as soon as possible.
- The SVS lamp illuminates during a bulb test and a system test.
- A DTC will be stored if the SVS lamp is requested by the ECM.

SVS Lamp Illumination
- The SVS lamp will illuminate with ignition switch ON and the engine not running.
- The SVS lamp will turn OFF when the engine is started.
- The SVS lamp will remain ON if the self-diagnostic system has detected a malfunction.
- The SVS lamp may turn OFF if the malfunction is not present.
- If the SVS lamp is illuminated and then the engine stalls, the SVS lamp will remain illuminated so long as the ignition switch is ON.
- If the SVS lamp is not illuminated and the engine stalls, the SVS lamp will not illuminate until the ignition switch is cycled OFF, then ON.

Service Vehicle Soon (SVS) Lamp Always On [12,000 lbs GVW]
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) Connector End Views

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