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Home >> GMC >> 1991 >> Forward Control 6.2 J, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 149 (Cruise Control System) >> Diagnostic Tests >> Test SC-4A - Checking Speed Control Brake Switch Sense
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Test SC-4A - Checking Speed Control Brake Switch Sense

WARNING: This page is about a different car, the 1995 Dodge Ram Wagon and 1995 Dodge Ram Van. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect brake switch 6-pin connector. Check connector, and clean and repair as necessary. Turn ignition on. With DRB in voltmeter mode, probe brake switch connector terminal No. 3, brake switch sense circuit (White/Pink wire).
  2. If voltage is less than 10 volts, go to TEST SC-4B  . If voltage is greater than 10 volts, connect a jumper wire between brake switch connector terminals No. 3, brake switch sense circuit (White/Pink wire) and No. 6, ground circuit (Black wire or Black/White wire).
  3. Using DRB read input status of brake switch. If DRB displays brake switch RELEASED, replace brake switch. Perform VERIFICATION TEST SC-VER  . If DRB does not display brake switch RELEASED, repair open in Black wire or Black/White wire. Perform VERIFICATION TEST SC-VER  .