Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCADILLAC1998SEVILLE SLS V8-4.6L VIN YREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDESCRIPTION AND OPERATIONPCM CONTROLLED SMCC CRUISE CONTROL
1998 Cadillac Seville SLS V8-4.6L VIN Y
PCM Controlled SMCC Cruise Control
1998 Cadillac Seville SLS V8-4.6L VIN YSECTION PCM Controlled SMCC Cruise Control
Diagnostic Chart:
This powertrain has a Stepper Motor Cruise Control (SMCC) system which closely approximates a stand alone system, except that the SMCC relies on the PCM to indicate that cruise control is allowed and then signals the PCM when engaged. This is accomplished by using a two wire link between the PCM and SMCC. These are called the Cruise Inhibit and the Cruise Engaged circuits. If the PCM will allow operation, refer to the Cruise Operation table, it signals the SMCC on the Cruise Inhibit circuit to allow cruise. Once cruise is engaged by the driver, the SMCC will continuously signal to the PCM that cruise is engaged using the Cruise Engaged circuit.
Refer to Cruise Control for information regarding the cruise system not related to PCM interaction.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.