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Code 38: Brake Switch Circuit: Notes

WARNING: This page is about a different car, the 1990 Oldsmobile Cutlass Cruiser, 1990 Oldsmobile Cutlass Ciera, 1990 Oldsmobile Cutlass Calais, 1990 Buick Skylark, and 1990 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

Code 38 will set if no Code 24 is present, status at circuit No. 420 has not changed from high to low and vehicle speed has been greater than 35 MPH and back to zero MPH, 22 or more times.

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Jumpering the brake switch determines if the ECM and wiring for the brake switch are okay.
  2. Verifies the voltage to the brake switch.
  3. Tests the brake switch for proper operation or misadjustment.
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