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Home >> Buick >> 1994 >> Roadmaster Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 5.7L >> ECM/Pcm Code Charts >> Code 38, TCC Brake Switch Error >> Notes
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Code 38, TCC Brake Switch Error: Notes

PCM monitors activity of the normally-closed brake switch. Switch opens when brake pedal is applied.

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. Checks for voltage at brake switch.
  2. Simulates brake switch closed or brakes off. Checks TCC brake switch circuit between PCM and switch.
  3. Checks circuit between TCC brake switch and PCM. Test opens TCC brake switch, simulating brakes applied.
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