Code 38, Brake Switch Circuit - 3.3L PFI N Body: Notes

Fig 1: Code 38, Brake Switch Circuit Diagram (3.3L PFI N Body)

Courtesy of GENERAL MOTORS CORP.

ECM monitors status of brake switch circuits through ECM terminal BC4. Code 38 will set under the following conditions:

• No. Code 24 is present.
• Vehicle speed has been above 35 MPH and back to 0 MPH 23 times.
• Status of circuit No. 420 has not changed state.
  NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Jumpering brake switch will determine if ECM and wiring for brake circuit are okay.
  2. This test verifies supply voltage to brake switch.