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 MANUALSBUICK1989LESABRE T-TYPEREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCRUISE CONTROL SYSTEMS
1989 Buick LeSabre T-Type
Cruise Control Systems
1989 Buick LeSabre T-TypeSECTION Cruise Control Systems
- Description & Operation
- Adjustments
- Testing
- Notes
- Cruise Control Model-To-Diagnostic Chart Menu
- Chart No. 1: Cruise Switch Short (Test A)
- Chart No. 1: Power Circuit Open (Test B)
- Chart No. 1: Brake Circuit Open (Test C)
- Chart No. 1: Vent Circuit Open (Test D)
- Chart No. 1: Vacuum Circuit Open (Test E)
- Chart No. 1: SPS Circuit Open (Test F)
- Chart No. 1: SC Circuit Open (Test G)
- Chart No. 1: Vacuum Circuit Short (Test H)
- Chart No. 1: R/A Circuit Open (Test I)
- Chart No. 1: Vent Circuit Short (Test J)
- Chart No. 1: VSS Circuit Open (Test K)
- Chart No. 1: VSS Circuit Short (Test L)
- Chart No. 1: Vacuum System (Test M)
- Chart No. 1: SPS Circuit Short (Test N)
- Chart No. 1: SPS Short (Test O)
- Chart No. 1: Cruise Control Module (Test P)
- Chart No. 2: Cruise Switch Short (Test A)
- Chart No. 2: Power Circuit Open (Test B)
- Chart No. 2: Brake Circuit Open (Test C)
- Chart No. 2: Vent Circuit Open (Test D)
- Chart No. 2: Vacuum Circuit Open (Test E)
- Chart No. 2: SPS Circuit Open (Test F)
- Chart No. 2: SC Circuit Open (Test G)
- Chart No. 2: Vacuum Circuit Short (Test H)
- Chart No. 2: R/A Circuit Open (Test I)
- Chart No. 2: Vent Circuit Short (Test J)
- Chart No. 2: VSS Circuit Open (Test K)
- Chart No. 2: VSS Circuit Short (Test L)
- Chart No. 2: Vacuum System Test (Test M)
- Chart No. 2: SPS Circuit Short (Test N)
- Chart No. 2: Cruise Control Module (Test O)
- Chart No. 3: Cruise Control Diagnosis & Testing
- Chart No. 4: Cruise Control Diagnosis & Testing
- Isolation Test
- Trouble Shooting
- Wiring Diagrams
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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.