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Home >> GMC >> 1992 >> Forward Control 4.3 Z, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 132 (Cruise Control System) >> Self-Diagnostic Tests >> Test SC-1B - Checking Speed Control Operation
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Test SC-1B - Checking Speed Control Operation

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. Turn ignition off. Disconnect brake switch connector. Check connector for damaged, pushed out or miswired terminals. Repair as necessary. Perform TEST SC-VER  . If connector is okay, turn ignition on. Press speed control switch on.
  2. Using DRB in voltmeter mode, check voltage of brake switch connector, speed control on/off switch sense circuit (Yellow/Red wire). If voltage is less than 10 volts, go to step 4).
  3. If voltage is greater than 10 volts, turn ignition off. Using an external ohmmeter, check resistance of speed control brake switch output circuit (Dark Blue/Red wire) between brake switch connector and speed control servo connector. If resistance is greater than 5 ohms, repair open in Dark Blue/Red wire. Perform TEST SC-VER  . If resistance is less than 5 ohms, replace brake switch. Perform TEST SC-VER  .
  4. Turn ignition off. Gain access to speed control servo switch. DO NOT disconnect speed control switch connector. Turn ignition on. Press speed control switch on. Using DRB in voltmeter mode, backprobe speed control switch connector, on/off switch output circuit (Brown/Red wire). If voltage is less than 10 volts, replace speed control switch. Perform TEST SC-VER  . If voltage is greater than 10 volts, repair open Brown/Red wire. Perform TEST SC-VER  .
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