Grand Prix V6-3100 3.1L MFI VIN M (1994)
Steering Mounted Controls: Initial Inspection and Diagnostic Overview
Troubleshooting Hints
PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS
1. Check Fuse 38. If open, check CKT 43 for a short to ground.
2. Check that grounds G201 and G203 are clean and tight.
3. If switches on one side of the Steering Wheel operate but the other side is inoperative, replace Steering Wheel Control Switches.
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Check for a broken (or partially broken) wire inside of the insulation which could cause system malfunction but prove "GOOD" in a
continuity/voltage check with a system disconnected. These circuits may be intermittent or resistive when loaded, and if possible, should be
checked by monitoring for a voltage drop with the system operational (under load).
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Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems (refer to General
Troubleshooting Procedures). See: Diagrams/Diagnostic Aids
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Refer to System Diagnosis. See: System Diagnosis
System Diagnosis
Refer to the Symptom Table for the appropriate diagnostic procedure(s). See: Symptom Related Diagnostic Procedures/Symptom Table
General Information
The Steering Wheel Controls consist of several components. They include the following:
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Steering Wheel Radio Control Switches
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SIR Coil Assembly
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Radio
SIR Coil Assembly
The Supplemental Inflatable Restraint (SIR) Coil Assembly contains four wires used by the Steering Wheel Controls. This allows voltages to be sent
from the Steering Wheel Switches to the Radio while the Steering Wheel is being turned.
Steering Wheel Radio Control Switches
The Steering Wheel Control Switches control Radio power, volume and station frequency. These switches are actually a ladder network consisting of the
switches and a series of resistors. The ladder network is arranged so that each switch has a different resistance. This allows a different voltage output to
the Radio for each switch pressed.
The Steering Wheel Control (SWC) Switches use incandescent backlighting. The illumination signal CKT 8 is a Pulse Width Modulated (PWM) signal
from the Headlight Switch. The bulbs are serviceable.
