Troubleshooting Hints

1. CHECK condition of BRAKE, STOP/HAZ, and CRUISE Fuses. If Fuse is open, LOCATE and REPAIR source of overload. Replace Fuse.
2. If any Driveability Codes are Set, Refer "Powertrain Management.
3. If any ABS Codes are Set. Refer "Antilock Brake System". Antilock Brakes / Traction Control Systems

Important:
^ The "Set to get Cruise" feature requires the operator to set the initial Set Speed by using the "Set/Coast" button before the "Resume/Accel" Slider Switch input will be recognized whenever Cruise is turned "OFF" or Ignition Switch is closed.
^ The "Brake Before Cruise" feature requires the Cruise Module to see Terminal "D" change states, once each Ignition Cycle before allowing Cruise Control. (Some Cruise Modules will use either "D" or "G").

4. CHECK that Cruise Control Module Linkage is connected and moving freely.
5. CHECK Cruise Cable Adjustment.
^ CHECK that CKT 17 and the Stoplamps are working properly. If inoperative, Cruise Module will be disabled.
^ Cruise performance can be affected by Trailer Towing and steep grades.
^ CHECK for a broken (or partially broken) wire inside of the insulation which could cause system failure 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 effect the integrity of other system (Refer "Troubleshooting Procedures"). Diagnostic Aids
6. For Diagnosis of Cruise Control with Diesel Engine REFER to Diesel Engine Controls.