Cruise Control Scan Tool Test: 1992

If no fault codes are present, check for blown RADIO fuse. If fuse is blown, go to CRUISE CONTROL SHORT TEST . If fuse is okay, enter DATA MODE on scan tool and check status of CRUISE ON input.
If scan tool indicates CRUISE ON input is off, go to next step. If scan tool indicates CRUISE ON input is on, check Gray wire between ECM White 24-pin connector terminal No. 20 and multifunction lever connector terminal E2 for a short to battery voltage. See Fig 1 and Fig 2 . Repair as necessary. If wire is okay, replace multifunction lever.
NOTE: On 4-cylinder models, ECM is located behind glove box. Multifunction lever connector is located behind left side of instrument panel below steering column.

Fig 1: Identifying ECM Connector Terminals (4-Cylinder Models)
Courtesy of GENERAL MOTORS CORP.

NOTE: Figures 2, 5, 6, 7, 9 & 10 are Courtesy of General Motors Corp.

Fig 2: Identifying Multifunction Lever Connector Terminals (Century, Cutlass Ciera, Cutlass Cruiser & 6000)
Place cruise control main switch in R/A position. Using scan tool, observe RESUME and CRUISE ON inputs. If scan tool indicates either CRUISE ON or RESUME input is off, go to step 12). If scan tool indicates both inputs are on, go to next step.
Turn cruise control main switch to ON position. While monitoring SET INPUT on scan tool, press and release cruise control SET switch. If SET input cycles on and then off, go to step 7). If SET input does not cycle on and then off, go to next step.
Check Dark Blue wire between ECM White 24-pin connector terminal No. 21 and multifunction lever connector terminal E3 for an open or short. See Fig 1 and Fig 2 . Repair as necessary. If wire is okay, replace multifunction lever.
Using scan tool, monitor BRAKE input and press and release brake pedal. If BRAKE input changed when pedal was pressed, go to step 9). If BRAKE input did not change, check brake switch and switch adjustment. Continuity should exist between brake switch terminals when switch plunger is fully depressed. See BRAKE & CLUTCH RELEASE SWITCHES ADJUSTMENT under ADJUSTMENTS.
If switch and adjustment are okay, check Brown wire between ECM Black 24-pin connector terminal No. 14 and brake switch. See Fig 1 . Repair as necessary. If wire is okay, repair Gray wire between brake switch and ECM Black 24-pin connector terminal No. 20.
Using scan tool, monitor PARK/NEUTRAL input while placing gear selector in Park, Neutral and Drive positions. If input signal corresponds with gear selector position, perform SERVO RESISTANCE TEST. If input signal does not correspond with gear selector position, go to next step.
Check for continuity between transaxle position switch terminals while moving gear selector to each position. Continuity should be present in Park and Neutral positions only. Replace transaxle position switch if faulty.
If transaxle position switch is okay, check Orange/Black wire between ECM White 24-pin connector terminal No. 18 and transaxle switch for open or short. See Fig 1 . Repair as necessary. If wire is okay, check for continuity between transaxle switch connector Black/White wire and ground. Repair if continuity is not present.
If scan tool indicates both RESUME and CRUISE ON inputs are off, go to step 13). If RESUME input alone is off, go to step 14). If CRUISE ON input is off and RESUME input is on, check Gray wire between ECM White 24-pin connector terminal No. 20 and multifunction lever connector terminal E2 for an open. See Fig 1 and Fig 2 . Repair as necessary. If wire is okay, replace multifunction lever.
Check Brown/White and Yellow wires between fuse block and multifunction lever connector terminal E1 for opens. See Fig 2 . Repair as necessary. If wires are okay, replace multifunction lever.
Check Gray/Black wire between ECM White 24-pin connector terminal No. 4 and multifunction lever connector terminal E4 for an open. See Fig 1 and Fig 2 . Repair as necessary. If wire is okay, replace multifunction lever.