Pinpoint Test C: No Power In Run - Vehicles With An Ignition Switch

NOTE: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multi-meter probes.

C1 REVIEW THE BCM DTCs
- Review the BCM DTCs retrieved during inspection and verification.
- Is DTC B1310:14 present?
  - Yes: GO to C6.
  - No: For all other BCM DTCs, GO to the BODY CONTROL MODULE (BCM) DTC CHART .
    If no DTCs are present, GO to C2 .
C2 CHECK FOR RUN VOLTAGE AT THE BCM
- Ignition OFF.
- Disconnect: BCM C2280B.
- Ignition ON.
- Measure the voltage between BCM C2280B-29, circuit CDC34 (WH/OG), harness side and ground.
  
  Fig 1: Identifying Measuring Resistance Between BCM C2280B-29 And Ignition Switch C250-1 Connector End View
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
  - Yes: GO to C4.
  - No: GO to C3 .
C3 CHECK THE IGNITION RUN CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Ignition Switch C250.
- Measure the resistance between BCM C2280B-29, circuit CDC34 (WH/OG), harness side and ignition switch C250-1, circuit CDC34 (WH/OG), harness side.
  
  Fig 2: Identifying Measuring Voltage Between Run/Start Relay Cavity 2, Circuit SBB87 (WH/RD) And Ground Connector End View
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
  - Yes: INSTALL a new ignition switch. REFER to IGNITION SWITCH . CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
  - No: REPAIR circuit CDC34 (WH/OG). TEST the system for normal operation.
C4 CHECK THE RUN/START RELAY
- Ignition OFF.
- Disconnect: Run/Start Relay.
- Carry out the appropriate relay component test.
  Refer to appropriate SYSTEM WIRING DIAGRAMS article for component testing.
- Is the relay OK?
  - Yes: GO to C5 .
  - No: INSTALL a new run/start relay. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
C5 CHECK THE VOLTAGE TO THE RUN/START RELAY COIL
- Measure the voltage between run/start relay cavity 2, circuit SBB87 (WH/RD), and ground.
  
  Fig 3: Identifying Measuring Voltage Between Run/Start Relay Cavity 2, Circuit SBB87 (WH/RD) And Ground Connector End View
  Courtesy of FORD MOTOR CO.
- Is the voltage greater than 10 volts?
  - Yes: GO to C6 .
  - No: VERIFY BJB fuse 87 (5A) is OK. If OK, REPAIR circuit SBB87 (WH/RD). If not OK, REFER to the appropriate SYSTEM WIRING DIAGRAMS article to identify the possible cause of the circuit short. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
C6 CHECK THE RUN/START RELAY CONTROL CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Run/Start Relay (if not previously disconnected).
- Disconnect: BCM C2280F.
- Measure the resistance between run/start relay cavity 1, circuit CDC55 (BN/VT), and BCM C2280F-18, circuit CDC55 (BN/VT), harness side.
  
  Fig 4: Identifying Measuring Resistance Between Run/Start Relay Cavity 1 And BCM C2280F-18 Connector End View
  Courtesy of FORD MOTOR CO.
- Is the resistance less than 5 ohms?
  - Yes: GO to C7 .
  - No: REPAIR circuit CDC55 (BN/VT). CARRY OUT a self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
C7 CHECK THE RUN/START RELAY CONTROL CIRCUIT FOR A SHORT TO GROUND
- Measure the resistance between BCM C2280F-18, circuit CDC55 (BN/VT), harness side and ground.
  
  Fig 5: Identifying Measuring Resistance Between BCM C2280F-18 And Ground Connector End View
  Courtesy of FORD MOTOR CO.
- Is the resistance greater than 5 ohms?
  - Yes: GO to C8 .
  - No: REPAIR circuit CDC55 (BN/VT). CARRY OUT a self-test (required to clear certain DTCs). CORRECT any unresolved DTCs. CLEAR all DTCs. TEST the system for normal operation.
C8 CHECK FOR CORRECT BCM OPERATION
- Check BCM C2280B and C2280F for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect: BCM C2280B.
- Connect: BCM C2280F.
- Connect: Ignition Switch C250.
- Connect: Run/Start Relay.
- Make sure the connectors are seated correctly, then carry out a BCM self-test.
- Operate the system and verify the concern is still present.
- Is the concern still present?
  - Yes: INSTALL a new BCM . REFER to MULTIFUNCTION ELECTRONIC MODULES . REPEAT the self-test.
  - No: The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. TEST the system for normal operation.