DTC 91: Open Brake Switch During Deceleration & DTC 92: Open Brake Switch When Abs Required: Description

DTC 91 can be set if 3 deceleration cycles occur without brake switch input to EBCM. DTC 92 can be set if vehicle speed is above 5 MPH, brake switch was not closed and a release was required on two brake circuits for 1/2 second. DTC 91 is used to detect an open brake switch in non-ABS mode. DTC 92 is run to determine proper operation of brake switch. ABS mode is activated only when brake switch is closed. If brake switch is open, ABS will never be activated.