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

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

Refer to Wiring Diagrams 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 mismatch between the switch input circuits, one indicates closed and one indicates open.
BCM B108A:24	Start Button: Signal Stuck High	Sets continuous when the BCM detects a fault on one of the ignition switch input circuits for 10 seconds or longer.
BCM B108A:9E	Start Button: Stuck On	Sets continuous when the BCM detects only one switch input circuit indicating open when the start button is released.
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 from the BCMC run/start relay control circuit. When set, the control side of the run/start relay is disabled via the Field Effect Transistor (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.
BCM B1310:14	Run/Start Control: Circuit Short To Ground Or Open	The BCM continuously monitors the BCMC RUN/START relay control circuit. This DTC is set if the BCM detects an open or a short to ground on the BCMC RUN/START relay control circuit. 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

Wiring, terminals or connectors
Push button ignition switch
BCMC
BCM

Visual Inspection and Pre-checks

Inspect the battery and battery cables.
Inspect the BCM fuse 20 (5A)

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

G1 CHECK THE VEHICLE BATTERY
- Carry out the Battery Condition Test. REFER to: Battery .
Is the battery OK?

Yes If DTC B108A:01, B108A:24, B108A:9E or B1142:29 is present, GO to G4 Otherwise, GO to G2

No CORRECT the battery condition.

G2 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 G19

No GO to G3

G3 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 G19

No GO to G4

G4 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: Perimeter Anti-Theft Alarm .

No GO to G5

G5 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 G13

No	VERIFY BCM fuse 20 (5A) is OK. If OK, GO to G6 If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible causes of the circuit short.

G6 CHECK THE START/STOP 1 INPUT CIRCUIT FOR A SHORT TO VOLTAGE

Disconnect BCM C2280B.

Disconnect BCM C2280A.

Disconnect PCM C1232B 2. 7L.

Disconnect PCM C1233B 3. 0L Diesel.

Disconnect PCM C1551B 3. 3L.

Disconnect PCM C175B 3. 5L.

Disconnect PCM C1381B 5. 0L.

Disconnect Push Button Ignition Switch C2195.

Measure:

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

Is any voltage present?

Yes	REPAIR the circuit.

GO to G7

G7 CHECK THE START/STOP 1 INPUT CIRCUIT FOR A SHORT TO THE START/STOP 2 INPUT CIRCUIT

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2195-1	Courtesy of FORD MOTOR COMPANY	C2195-6

Is the resistance greater than 10, 000 ohms?

Yes

GO to G8

No	REPAIR the circuit.

G8 CHECK THE START/STOP 1 INPUT CIRCUIT FOR A SHORT TO GROUND

Measure:

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

Is the resistance greater than 10, 000 ohms?

Yes

GO to G9

No	REPAIR the circuit.

G9 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_2PID

Connect:

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

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 G10

G10 CHECK FOR VOLTAGE TO THE IGNITION SWITCH

Measure:

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

Is the voltage greater than 11 volts?

Yes

GO to G12

GO to G11

G11 CHECK THE IGNITION SWITCH VOLTAGE SUPPLY CIRCUIT FOR AN OPEN

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2195-4	Courtesy of FORD MOTOR COMPANY	C2280A-12

Is the resistance less than 3 ohms?

Yes

GO to G25

No	REPAIR the circuit.

G12 CHECK THE BCM (BODY CONTROL MODULE) START/STOP 1 INPUT CIRCUIT FOR AN OPEN

Measure:

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

Is the resistance less than 3 ohms?

Yes

GO to G25

No	REPAIR the circuit.

G13 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_2PIDwhile pressing and releasing the START/STOP button.
Does the PID change state when the START/STOP button is pressed and released?

Yes GO to G25

No GO to G14

G14 CHECK THE BCM (BODY CONTROL MODULE) START/STOP 2 INPUT CIRCUIT FOR A SHORT TO VOLTAGE

Disconnect BCM C2280B.

Disconnect Push button ignition switch C2195.

Measure:

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

Is there any voltage present?

Yes	REPAIR the circuit.

GO to G15

G15 CHECK THE BCM (BODY CONTROL MODULE) START/STOP 2 INPUT CIRCUIT FOR A SHORT TO GROUND

Measure:

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

Is the resistance greater than 10, 000 ohms?

Yes

GO to G16

No	REPAIR the circuit.

G16 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
C2195-6	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 G17

GO to G18

G17 CHECK THE IGNITION SWITCH GROUND CIRCUIT FOR AN OPEN

Measure:

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

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.

G18 CHECK THE BCM (BODY CONTROL MODULE) START/STOP 2 INPUT CIRCUIT FOR AN OPEN

Measure:

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

Is the resistance less than 3 ohms?

Yes

GO to G25

No	REPAIR the circuit.

G19 CARRY OUT A NETWORK TEST

Using a diagnostic scan tool, carry out the network test.

Does the IPC and the BCM pass the network test?

Yes	VERIFY the BCM fuse 20 (5A) is OK. If OK, GO to G20 If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible cause of the circuit short.

G20 CHECK FOR AN INTERMITTENT COMMUNICATION CONCERN
- Using a diagnostic scan tool, retrieve the Continuous Mode Diagnostic Trouble Codes (CMDTCs) from all modules.
Are multiple communication Diagnostic Trouble Codes (DTCs) set in multiple modules?

Yes DIAGNOSE an intermittent network concern.

No If DTC B1310:12 is present, GO to G24Otherwise, GO to G21

G21 CHECK THE RUN/START RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND

Ignition OFF.

Disconnect negative battery cable.

Disconnect BCM C2280F.

Measure:

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

Is the resistance greater than 10, 000 ohms?

Yes

GO to G25

GO to G22

G22 ISOLATE THE RUN/START RELAY CONTROL CIRCUIT SHORT TO GROUND

Disconnect BCMC C1035B.

Measure:

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

Is the resistance greater than 10, 000 ohms?

Yes

GO to G23

No	REPAIR the circuit.

G23 CHECK THE RUN/START RELAY CONTROL CIRCUIT FOR AN OPEN

Disconnect BCMC C1035B.

Measure:

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

Is the resistance less than 3 ohms?

Yes

GO to G24

No	REPAIR the circuit.

G24 CHECK THE RUN/START RELAY CONTROL CIRCUIT FOR A SHORT TO VOLTAGE

Disconnect BCM C2280F.

Disconnect BCMC C1035B.

Measure:

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

Is any voltage present?

Yes	REPAIR the circuit.

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 BCMC. REFER to: Body Control Module C (BCMC) . . TEST the system for normal operation. If the concern is still present, GO to G25

G25 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.