Riviera V6-231 3.8L VIN C SFI (1989)
Parking Brake Warning Switch: Testing and Inspection
Park Brake Switch Circuit
DESCRIPTION:
The BCM provides system voltage to the park brake circuit, and the park brake switch provides the single path to ground. The BCM supplies and
internally monitors the voltage level of the circuit at pin 1C5. When the park brake switch is open, the BCM detects system voltage, but if the park brake
switch provides a path to ground (the park brake is applied), the BCM will detect that the circuit has been grounded. Once the BCM has determined that
all the of the failure conditions have been met, it will send the "Park Brake On" message to the CRT. The BCM will also turn on the "Brake" indicator on
the IPC.
TEST CONDITIONS:
NONE.
FAILURE CONDITIONS:
1.
Park brake is applied (park brake switch closed).
2.
Ignition is on .
3.
Transmission not in Park or Neutral.
ACTION TAKEN:
1.
Display the "Park Brake On" message on the CRT.
2.
Turn on the "Brake" indicator light on the IPC.
DIAGNOSIS:
Erroneous message - Short to ground on circuit 80 or shorted switch.
No message - Open in circuit 80 or open in switch.
