Troubleshooting Hints

PERFORM BEFORE BEGINNING SYSTEM DIAGNOSIS
1. Check that Cruise Control Module Linkage is connected and moving freely.
2. Check Cruise Cable Adjustment.
3. Check for poor connection at G109.
4. Check connection at Cruise Control Module.
5. Check Brake Switch Adjustments:
^ Make sure ABS/TCS DTC(s) are diagnosed first. An open HMSL Circuit or "LOW TRAC" Indicator Circuit will set a DTC and also disable the Cruise Control Module. Check for burned-out HMSL Bulbs or "LOW TRAC" Indicator Lamp.
^ 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).
^ Check for proper installation of aftermarket electronic equipment which may affect the integrity of other systems (refer to "Troubleshooting Procedures"). Diagnostic Aids
^ Refer to System Diagnosis.

IMPORTANT:
^ Cruise will not control speed down large grades.
^ Cruise Performance may degrade with heavy loads, as when towing a trailer, depending on Powertrain capabilities.
^ The "Set To Get Cruise" feature requires the Operator to set an initial speed by using the "Set/Coast" button before the "Resume/Accel" Slider Switch would be active.
^ The "Brake Before Cruise" feature requires the Cruise Module to see brake input at terminal "D" to change states once each Ignition Cycle before allowing cruise to operate. (later production vehicles require brake input at either terminal "D" or "0").