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Home >> GMC >> 1992 >> Forward Control 4.3 Z, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 132 (Cruise Control System) >> Self-Diagnostic Tests >> Test SC-3A - Checking Speed Control Set/Resume Switch
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Test SC-3A - Checking Speed Control Set/Resume Switch

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, 1995 Dodge Caravan, and 1995 Chrysler Town & Country. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect brake switch connector. Using DRB in voltmeter mode, check voltage of brake switch connector, brake switch sense circuit (White/Pink wire). If voltage is less than 10 volts, go to step 3).
  2. If voltage is greater than 10 volts, connect a jumper wire between brake switch connector, brake switch sense circuit (White/Pink wire) and system ground circuit (Black wire). Using DRB, read brake switch input status. If DRB displays BRAKE SW RELEASED, replace brake switch. Perform TEST SC-VER  . If DRB does not display BRAKE SW RELEASED, repair open Black wire. Perform TEST SC-VER  .
  3. Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Check connector for damaged, pushed out or miswired terminals. Repair as necessary. Perform TEST SC-VER  . If connector is okay, go to next step.
  4. Using DRB in ohmmeter mode, check resistance of PCM connector terminal No. 29, brake switch sense circuit (White/Pink wire). If resistance is less than 5 ohms, repair short to ground in White/Pink wire. Perform TEST SC-VER  . If resistance is greater than 5 ohms, replace PCM. Perform TEST SC-VER  .
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