Pinpoint Test A: No Power In On - Push Button Ignition Switch

WARNING: This page is about a different car, the 2023 Ford Bronco. However, it is still accessible from the selected car via links, so may be relevant.

Refer to MODULE COMMUNICATION NETWORK for schematic and connector information. Refer to STARTING SYSTEM for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Steering Wheel and Column Electrical Components - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
BCM B108A:01	Start Button: General Electrical Failure	Sets continuous when the BCM detects a fault from one of the ignition switch input circuits.
BCM B108A:24	Start Button: Signal Stuck High	Sets continuous when the BCM detects a fault from one of the ignition switch input circuits.
BCM B1142:29	Ignition Status 1: Signal Invalid	Sets during the on-demand self-test when the BCM detects a fault from one of the ignition switch input circuits.
BCM B1310:12	Run/Start Control: Circuit Short To Battery	Sets when the BCM detects a short to voltage on the BCM-C run/start relay control circuit. When set, the control side of the run/start relay is disabled via the Field Effect Transistor (FET) in the BCM. Once the condition that caused the DTC to set is repaired, the BCM must pass a self-test in order for the DTC to clear and the system to resume normal operation.
BCM B1310:14	Run/Start Control: Circuit Short To Ground Or Open	The BCM continuously monitors the control side of the run/start relay in the BCM-C. This DTC is set if the BCM detects an open or a short to ground on the control side of the run/start relay. When this DTC sets, the BCM disables the control side of the RUN/START relay FET. Once the condition that caused the DTC to set is repaired, the BCM must pass a self-test in order for the DTC to clear and the system to resume normal operation.

Possible Sources

Battery voltage concern
Fuse
Wiring, terminals or connectors
PATS concern
Push button ignition switch
BCM

Visual Inspection and Pre-checks

Inspect the battery and battery cables.
Inspect the BCM fuse 19 (5A).

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

A1 CHECK THE VEHICLE BATTERY
- Carry out the Battery Condition Test. REFER to: Battery .
Is the battery OK?

Yes GO to A2

No CORRECT the battery condition.

A2 CHECK FOR BCM (BODY CONTROL MODULE) DTC (DIAGNOSTIC TROUBLE CODE) B1310:12 OR B1310:14
- Using a diagnostic scan tool, carry out the BCM self-test.
Is DTC B1310:12 or B1310:14 present?

Yes GO to A17

No GO to A3

A3 CHECK FOR IGNITION ON MODE
- Press and release the START/STOP button while monitoring the ignition mode indicator at the top of the button.
Does the ignition mode indicator flash on and off continuously?

Yes GO to A17

No GO to A4

A4 CHECK FOR A PATS (PASSIVE ANTI-THEFT SYSTEM) CONCERN
- Press the START/STOP button while monitoring the message center.
Does No key detected display in the message center?

Yes REFER to: Passive Anti-Theft System (PATS) .

No GO to A5

A5 CHECK THE IGNITION SWITCH 1 (START_STOP_1) PID (PARAMETER IDENTIFICATION)

Using a diagnostic scan tool, view the BCM Parameter Identification (PIDs).

Access the BCM and monitor the START_STOP_1PIDwhile pressing and releasing the START/STOP button.

Does the PID change state when the START/STOP button is pressed and released?

Yes

GO to A12

No	VERIFY BCM fuse 19 (5A) is OK. If OK, GO to A6 If not OK, REFER to OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short.

A6 CHECK THE START/STOP 1 INPUT CIRCUIT FOR A SHORT TO VOLTAGE

Disconnect BCM C2280B.

Disconnect PCM C175B (2.3L), C1551B (2.7L).

Disconnect Push Button Ignition Switch C2195.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2195 Pin 1	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

GO to A7

A7 CHECK THE START/STOP 1 INPUT CIRCUIT FOR A SHORT TO GROUND

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2195 Pin 1	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to A8

No	REPAIR the circuit.

A8 BYPASS THE PUSH BUTTON IGNITION SWITCH WHILE MONITORING THE IGNITION SWITCH 1 (START_STOP_1) PID (PARAMETER IDENTIFICATION)

Connect BCM C2280B.

Using a diagnostic scan tool, view the BCM Parameter Identification (PIDs).

Access the BCM and monitor the START_STOP_1PID

Connect:

Lead 1	Measurement / Action	Lead 2
C2195 Pin 1	Courtesy of FORD MOTOR COMPANY	C2195 Pin 4

Remove the fused jumper wire.

Does the PID indicate the START/STOP button is pressed with the fused jumper wire connected?

Yes	INSTALL a new push button ignition switch. REFER to: Ignition Switch - Vehicles With: Keyless Vehicle System .

GO to A9

A9 CHECK FOR VOLTAGE TO THE IGNITION SWITCH

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2195 Pin 4	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to A11

GO to A10

A10 CHECK THE IGNITION SWITCH VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Disconnect BCM C2280A.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2195 Pin 4	Courtesy of FORD MOTOR COMPANY	C2280A Pin 11

Is the resistance less than 3 ohms?

Yes

GO to A23

No	REPAIR the circuit.

A11 CHECK THE BCM (BODY CONTROL MODULE) START/STOP 1 INPUT CIRCUIT FOR AN OPEN

Disconnect BCM C2280B.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2195 Pin 1	Courtesy of FORD MOTOR COMPANY	C2280B Pin 51

Is the resistance less than 3 ohms?

Yes

GO to A23

No	REPAIR the circuit.

A12 CHECK THE IGNITION SWITCH 2 (START_STOP_2) PID (PARAMETER IDENTIFICATION)
- Using a diagnostic scan tool, view the BCM Parameter Identification (PIDs).
Access the BCM and monitor the START_STOP_2PID

Does the PID change state when the START/STOP button is pressed and released?

Yes GO to A23

No GO to A13

A13 CHECK THE BCM (BODY CONTROL MODULE) START/STOP 2 INPUT CIRCUIT FOR A SHORT TO GROUND

Disconnect BCM C2280B.

Disconnect Push Button Ignition Switch C2195.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2195 Pin 6	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance greater than 10, 000 ohms?

Yes

GO to A14

No	REPAIR the circuit.

A14 BYPASS THE PUSH BUTTON IGNITION SWITCH WHILE MONITORING THE IGNITION SWITCH 2 (START_STOP_2) PID (PARAMETER IDENTIFICATION)

Connect BCM C2280B.

Using a diagnostic scan tool, view the BCM Parameter Identification (PIDs).

Access the BCM and monitor the START_STOP_2PID

Connect:

Lead 1	Measurement / Action	Lead 2
C2195 Pin 6	Courtesy of FORD MOTOR COMPANY	Ground

Remove the fused jumper wire.

Does the PID indicate the START/STOP button is pressed with the fused jumper wire connected?

Yes

GO to A15

GO to A16

A15 CHECK THE IGNITION SWITCH GROUND CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2195 Pin 4	Courtesy of FORD MOTOR COMPANY	C2195 Pin 3

Is the voltage greater than 11 volts?

Yes	INSTALL a new push button ignition switch. REFER to: Ignition Switch - Vehicles With: Keyless Vehicle System .

No	REPAIR the circuit.

A16 CHECK THE BCM (BODY CONTROL MODULE) START/STOP 2 INPUT CIRCUIT FOR AN OPEN

Disconnect BCM C2280B.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2195 Pin 6	Courtesy of FORD MOTOR COMPANY	C2280B Pin 5

Is the resistance less than 3 ohms?

Yes

GO to A23

No	REPAIR the circuit.

A17 CHECK THE BCM-C RUN/START RELAY CONTROL CIRCUIT FOR A FOR A SHORT TO GROUND

Ignition OFF.

Disconnect BCM C2280F.

Disconnect BCM-C C1035B.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2280F Pin 25	Courtesy of FORD MOTOR COMPANY	Ground

Is the resistance less than 3 ohms?

Yes	REPAIR the circuit.

GO to A18

A18 CHECK THE BCM-C RUN/START RELAY CONTROL CIRCUIT FOR A FOR A SHORT TO VOLTAGE

Ignition OFF.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2280F Pin 25	Courtesy of FORD MOTOR COMPANY	Ground

Is any voltage present?

Yes	REPAIR the circuit.

GO to A19

A19 CHECK THE BCM-C RUN/START RELAY CONTROL CIRCUIT FOR A FOR AN OPEN

Ignition OFF.

Disconnect BCM-C C1035B.

Disconnect BCM C2280F.Measure:

Positive Lead	Measurement / Action	Negative Lead
C2280F Pin 25	Courtesy of FORD MOTOR COMPANY	C1035B Pin 39

Is the resistance less than 3 ohms?

Yes

GO to A20

No	REPAIR the circuit.

A20 CARRY OUT A NETWORK TEST
- Connect BCM C2280F.
- Connect BCM-C C1035B.
- Using a diagnostic scan tool, perform the network test.
Do the IPC and the BCM pass the network test?

Yes GO to A21

No Refer to the appropriate Electrical Distribution article for the procedure.

A21 CHECK VOLTAGE SUPPLY TO THE BCM (BODY CONTROL MODULE)

Ignition OFF.

Disconnect BCM C2280H.

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2280H Pin 1	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to A23

GO to A22

A22 CHECK THE BCM (BODY CONTROL MODULE) VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2280H Pin 1	Courtesy of FORD MOTOR COMPANY	C1035B Pin 59

Is the resistance LESS than 3 ohms?

Yes

CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, REPLACE the BCM-C. REFER to: Body Control Module C (BCMC) TEST the system for normal operation. If the concern is still present, GO to A23

No	REPAIR the circuit.

A23 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

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

Reconnect the BCM connectors and all other previously disconnected connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles 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 module connections. ADDRESS the root cause of any connector or pin issues.