Pinpoint Test B : Brake Transmission Shift Interlock Override Switch

WARNING: This page is about a different car, the 2018 Lincoln MKC. However, it is still accessible from the selected car via links, so may be relevant.

B1 CHECK THE BRAKE TRANSMISSION SHIFT INTERLOCK OVERRIDE SWITCH
- Using the diagnostic scan tool, observe the PIDs BW_OVR_SW_1 and the SBW_OVR_SW_2.
- Press and release the brake transmission shift interlock override switch.
Does the SBW_OVR_SW_1 and the SBW_OVR_SW_2 status change from Pressed to Released?

Yes The system is operating correctly at this time. INSPECT for mechanical obstruction in the path of the TRCM output arm.

No GO to B2

B2 CHECK THE BRAKE TRANSMISSION SHIFT INTERLOCK OVERRIDE SWITCH

Ignition OFF.

Disconnect Brake Transmission Shift Interlock C3430 .

Inspect the connector for damaged or pushed-out terminals.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3430-4	Courtesy of FORD MOTOR COMPANY	Ground
C3430-6	Courtesy of FORD MOTOR COMPANY	Ground

Is voltage greater than 5 volts?

Yes

GO to B3

No	REPAIR the circuit.

B3 CHECK THE BRAKE TRANSMISSION SHIFT INTERLOCK OVERRIDE CIRCUIT

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3430-4	Courtesy of FORD MOTOR COMPANY	C3430-2
C3430-6	Courtesy of FORD MOTOR COMPANY	C3430-2

Are the voltages greater than 5 volts?

Yes

GO to B4

No	REPAIR the circuit. If an open circuit is not found, INSTALL a new GSM. REFER to: Gearshift Module (GSM) .

B4 CHECK THE BRAKE TRANSMISSION SHIFT INTERLOCK GROUND CIRCUIT FOR AN OPEN

INSPECT for loose connector, corrosion, pushed out terminals.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3430-4	Courtesy of FORD MOTOR COMPANY	C3430-2

Is voltage greater than 5 volts?

Yes	INSTALL a new brake transmission shift interlock override switch. REFER to: Brake Shift Interlock Override Switch .

No	REPAIR the circuit. If an open circuit is not found, INSTALL a new GSM. REFER to: Gearshift Module (GSM) .