Pinpoint Test B: No Power In Acc - Conventional 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 Power Distribution for schematic and connector information.
Normal Operation and Fault Conditions

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

Possible Sources
- Wiring, terminals or connectors
- Ignition switch
- BCM
NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

B1 CHECK FOR BCM (BODY CONTROL MODULE) DTC (DIAGNOSTIC TROUBLE CODE) U300A:01
- Ignition ON.
- Using a diagnostic scan tool, carry out the BCM self-test.
Is DTC U300A:01 present?

Yes GO to Pinpoint Test L

No GO to B2

B2 CHECK FOR VOLTAGE TO THE BCM (BODY CONTROL MODULE) WITH THE IGNITION SWITCH IN THE ACC POSITION

Ignition OFF.

Disconnect BCM C2280B.

Accessory ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2280B-50	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to B4

GO to B3

B3 CHECK THE IGNITION ACC CIRCUIT FOR AN OPEN

Ignition OFF.

Disconnect Ignition Switch C250.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2280B-50	Courtesy of FORD MOTOR COMPANY	C250-6

Is the resistance less than 3 ohms?

Yes	INSTALL a new ignition switch. REFER to: Ignition Switch .

No	REPAIR the circuit.

B4 CHECK FOR VOLTAGE TO THE BCM (BODY CONTROL MODULE) WITH THE IGNITION SWITCH IN THE ON POSITION

Ignition ON.

Measure:

Positive Lead	Measurement / Action	Negative Lead
C2280B-50	Courtesy of FORD MOTOR COMPANY	Ground

Is the voltage greater than 11 volts?

Yes

GO to B5

No	INSTALL a new ignition switch. REFER to: Ignition Switch .

B5 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) 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

Reconnect the BCM 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.