Pinpoint Test A: Brake Shift Interlock

WARNING: This page is about a different car, the 2022 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.

Refer to SHIFT INTERLOCK for schematic and connector information.

Normal Operation and Fault Conditions

When the BCM receives a brake pedal applied input, it sends power to the Brake Shift Interlock Actuator (BSIA). When the actuator is energized, the plunger is pulled inward, allowing the selector lever to move from the park position.

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
BCM B1319:11	Shift Interlock (BSI) Output Circuit: Circuit Short To Ground	This DTC indicates a short to ground in the Brake Shift Interlock Actuator (BSIA) circuit.
BCM B1319:15	Shift Interlock (BSI) Output Circuit: Circuit Short To Battery Or Open	This DTC indicates an open circuit or a short to power in the Brake Shift Interlock Actuator (BSIA) circuit.

Possible Sources

Connectors damaged or pushed-out terminals, corrosion, loose wires and missing or damaged seals
BJB fuse
Circuit open or shorted
Stoplamp switch
Brake Shift Interlock Actuator (BSIA)
BCM

A1 CHECK THE OPERATION OF THE BSIA (BRAKE SHIFT INTERLOCK ACTUATOR) CIRCUIT
- Apply the parking brake.
- Using a diagnostics scan tool, access the BCM and use OSC to command BRK_SHIFT on and off.
- Attempt to move the selector lever out of P with BRK_SHIFT commanded on and with BRK_SHIFT commanded off.
Does the BSIA lock and unlock correctly as BRK_SHIFT is commanded on and off?

Yes GO to A2

No GO to A5

A2 CHECK THE STOPLAMP SWITCH VOLTAGE SUPPLY CIRCUIT FOR VOLTAGE

Ignition OFF.

Disconnect BPP switch C278 .

Inspect for damaged or pushed-out terminals.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C278-1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to A3

No	VERIFY BJB fuse F47 (10A) is OK. If the fuse is OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify and repair the open circuit. If the fuse is not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify and repair the short to ground.

A3 BYPASS THE STOPLAMP SWITCH

Connect a fused jumper:

Positive Lead	Measurement / Action	Negative Lead
C278-1	Courtesy of FORD MOTOR COMPANY	C278-4

Ignition ON.

Observe the stoplamps.

Are the stoplamps illuminated?

Yes	INSTALL a new stoplamp switch.

GO to A4

A4 CHECK THE STOPLAMP SWITCH CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect BCM C2280H .

Inspect for damaged or pushed-out terminals.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C278-4	Courtesy of FORD MOTOR COMPANY	C2280H-1

Is the resistance less than 3 ohms?

Yes

GO to A10

No	REPAIR the open circuit.

A5 CHECK THE BRAKE SHIFT INTERLOCK ACTUATOR POWER CIRCUIT FOR VOLTAGE

Ignition OFF.

Disconnect Selector Lever C3531 .

Inspect for damaged or pushed-out terminals.

Ignition ON.

Measure the following while applying and releasing the brake pedal:

Positive Lead	Measurement / Action	Negative Lead
C3531-12	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts with the brake pedal applied and approximately 0 volts with the brake pedal not applied?

Yes

GO to A9

No	If the voltage is less than 11 volts when the brake pedal is applied, GO to A6 If voltage is present when the brake pedal is not applied, GO to A8

A6 CHECK THE BRAKE SHIFT INTERLOCK ACTUATOR POWER CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect BCM C2280D .

Inspect for damaged or pushed-out terminals.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3531-12	Courtesy of FORD MOTOR COMPANY	C2280D-12

Is the resistance less than 3 ohms?

Yes

GO to A7

No	REPAIR the open circuit.

A7 CHECK THE BRAKE SHIFT INTERLOCK ACTUATOR POWER CIRCUIT FOR A SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3531-12	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to A10

No	REPAIR the short to ground.

A8 CHECK THE BRAKE SHIFT INTERLOCK ACTUATOR POWER CIRCUIT FOR A SHORT TO VOLTAGE

Ignition OFF.

Disconnect BCM C2280D .

Inspect for damaged or pushed-out terminals.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3531-12	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the short to power.

GO to A10

A9 CHECK THE BRAKE SHIFT INTERLOCK ACTUATOR GROUND CIRCUIT FOR AN OPEN

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C3531-11	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes	INSTALL a new selector lever. REFER to: Selector Lever Assembly .

No	REPAIR the open circuit.

A10 CHECK THE BCM (BODY CONTROL MODULE) FOR CORRECT OPERATION

Ignition OFF.

Disconnect and inspect all BCM connectors.

Repair:
- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

Connect all BCM connectors. Make sure they seat and latch correctly.

Operate the system and verify the concern is still present.

Is the concern still present?

Yes	CHECK for an applicable TSB, GSB, SSM, or FSA. If a service bulletin exists for this concern, discontinue this test and follow bulletin instructions. If none address this concern, INSTALL a new BCM. REFER to: Body Control Module (BCM) .

No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.