Pinpoint Test C: No Power In Run
WARNING: This page is about a different car, the 2014 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
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.
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.
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 open 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 OEM WIRING DIAGRAMS COMPONENT TESTING 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 1, circuit SBB31 (WH/RD) and ground.
Is the voltage greater than 10 volts?
- Yes : GO to C6 .
- No : VERIFY BJB fuse 31 (15A) is OK. If OK, REPAIR circuit SBB31 (WH/RD). If not OK, REFER to the OEM WIRING DIAGRAMS 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 2, circuit CDC55 (BN/VT) and BCM C2280F-18 , circuit CDC55 (BN/VT), harness side.
Is the resistance less than 5 ohms?
- Yes : GO to C7 .
- No : REPAIR circuit CDC55 (BN/VT) for an open. 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.
Is the resistance greater than 10, 000 ohms?
- Yes : GO to C8 .
- No : REPAIR circuit CDC55 (BN/VT) for short to ground. 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: 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 BODY CONTROL MODULE (BCM) . 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. CLEAR the DTCs. REPEAT the self-test. TEST the system for normal operation.
- Check BCM C2280B
and C2280F
for: