Pinpoint Test D: No Power In Start - Vehicles With An Ignition Switch

WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. 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.

D1 CHECK FOR VOLTAGE TO THE BCM AND PCM
- Ignition OFF.
- Disconnect: BCM C2280B .
- Disconnect: PCM C175B .
- With the ignition switch to the START position, measure the voltage between ground and:
  - BCM C2280B-47 , circuit CDC35 (BU/WH), harness side.
  - PCM C175B-16 , circuit CDC35 (BU/WH), harness side.
    
    Fig 1: Checking For Voltage To BCM And PCM
    Courtesy of FORD MOTOR CO.
Are the voltages greater than 10 volts?
- Yes : GO to D2 .
- No : REPAIR circuit CDC35 (BU/WH). TEST the system for normal operation.
D2 CHECK THE IGNITION START CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Ignition Switch C250 .
- Measure the resistance between ignition switch C250-7 , circuit CDC35 (BU/WH), harness side and:
  - BCM C2280B-47 , circuit CDC35 (BU/WH), harness side.
  - PCM C175B-16 , circuit CDC35 (BU/WH), harness side.
    
    Fig 2: Checking Ignition Start Circuit For Open
    Courtesy of FORD MOTOR CO.
Are the resistances less than 5 ohms?
- Yes : INSTALL a new ignition switch. REFER to IGNITION SWITCH . TEST the system for normal operation.
- No : REPAIR circuit CDC35 (BU/WH). TEST the system for normal operation.