Pinpoint Test C: No Power In On - 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 .
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition BCM B1142:29 Ignition Status 1: Signal Invalid Sets when the BCM does not receive a valid ignition signal during a BCM self-test. 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
- Network concern
- Wiring, terminals or connectors
- Ignition switch
- BCMC
- BCM
Visual Inspection and Pre-checks
- 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.
- C1 CARRY OUT A NETWORK TEST
- Ignition ON.
- Using a diagnostic scan tool, carry out the network test.
Does the BCM and the IPC pass the network test?
Yes GO to C2 No - C2 CHECK FOR BCM (BODY CONTROL MODULE) DTC (DIAGNOSTIC TROUBLE CODE) U300A:01
- 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 C3 - C3 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 C7 No GO to C4 - C4 CHECK FOR VOLTAGE TO THE BCM (BODY CONTROL MODULE) WITH THE IGNITION SWITCH IN THE ON POSITION
- Ignition OFF.
- Disconnect BCM C2280B.
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C2280B-37 Ground
Is the voltage greater than 11 volts?
Yes GO to C7 No VERIFY BCM fuse 20 (5A) is OK. If OK, GO to C5
If not OK, REFER to the OEM ELECTRICAL WIRING DIAGRAM INTRODUCTION to identify the possible cause of the circuit short. - C5 CHECK THE IGNITION ON-DESIGNATED INPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect Ignition Switch C250.
- Measure:
Positive Lead Measurement / Action Negative Lead C2280B-37 Ground
Is the resistance less than 3 ohms?
Yes REPAIR the circuit. No GO to C6 - C6 CHECK THE IGNITION ON-DESIGNATED INPUT CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect Ignition Switch C250.
Is the resistance less than 3 ohms?
Yes INSTALL a new ignition switch. REFER to: Ignition Switch . No REPAIR the circuit. - C7 CARRY OUT A NETWORK TEST
- Using a diagnostic scan tool, perform the network test.
Do the IPC and the BCM pass the network test?
Yes GO to C8 No DIAGNOSE an intermittent network concern. - C8 CHECK THE BCMC (BODY CONTROL MODULE C) RUN/START RELAY COIL CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- Disconnect BCMC C1035B.
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C1035B-25 Ground
Is the voltage greater than 11 volts?
Yes GO to C9 No GO to C10 - C9 ISOLATE THE BCMC (BODY CONTROL MODULE C) RUN/START RELAY COIL CONTROL CIRCUIT SHORT TO VOLTAGE
- Disconnect BCM C2280F.
- Ignition ON.
- Measure:
Positive Lead Measurement / Action Negative Lead C2280F-25 Ground
Is the voltage greater than 11 volts?
Yes REPAIR the circuit. No 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) . - C10 CHECK THE BCMC (BODY CONTROL MODULE C) RUN/START RELAY COIL CONTROL CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect BCM C2280F.
Is the resistance less than 3 ohms?
Yes GO to C11 No REPAIR the circuit. - C11 CHECK THE BCMC (BODY CONTROL MODULE C) RUN/START RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
- Measure:
Positive Lead Measurement / Action Negative Lead C2280F-25 Ground
Is the resistance greater than 10, 000 ohms?
Yes GO to C12 No REPAIR the circuit. - Measure:
- C12 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.