Pinpoint Test Aa: The HSWM Does Not Respond To The Scan Tool

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 correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Failure to disconnect the battery when instructed results in false resistance readings. Refer to BATTERY, MOUNTING AND CABLES .

AA1 CHECK THE HSWM VOLTAGE SUPPLY CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: HSWM C2406 .
- Ignition ON.
- Measure the voltage between the HSWM C2406-1 , circuit CBP36 (BU/BN), harness side and ground.
  
  Fig 1: Measuring Voltage Between HSWM C2406-1, Circuit CBP36 (BU/BN), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
  
  Is the voltage greater than 10 volts?
  1. Yes : GO to AA2.
  2. No : VERIFY the Body Control Module (BCM) fuse 36 (10A) is OK. If OK, REPAIR the circuit. If not OK, REFER to the SYSTEM WIRING DIAGRAMS to identify the possible causes of the circuit short. CLEAR the DTCs. REPEAT the network test with the scan tool.
AA2 CHECK THE HSWM GROUND CIRCUIT FOR AN OPEN
- Ignition OFF.
- Disconnect: Negative Battery Cable.
- Measure the resistance between the HSWM C2406-14 , circuit GD115 (BK/GY), harness side and ground.
  
  Fig 2: Measuring Resistance Between HSWM C2406-14, Circuit GD115 (BK/GY), Harness Side And Ground
  Courtesy of FORD MOTOR CO.
  
  Is the resistance less than 5 ohms?
  1. Yes : GO to AA3.
  2. No : REPAIR the circuit. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
AA3 CHECK THE MS-CAN CIRCUITS BETWEEN THE HSWM AND THE DLC FOR AN OPEN
- Measure the resistance between the HSWM C2406-4 , circuit VDB06 (GY/OG), harness side and the DLC C251-3 , circuit VDB06 (GY/OG), harness side.
  
  Fig 3: Measuring Resistance Between HSWM C2406-4, Circuit VDB06 (GY/OG) And DLC C251-3, Circuit VDB06 (GY/OG), Harness Side
  Courtesy of FORD MOTOR CO.
- Measure the resistance between the HSWM C2406-3 , circuit VDB07 (VT/OG), harness side and the DLC C251-11 , circuit VDB07 (VT/OG), harness side.
  
  Fig 4: Measuring Resistance Between HSWM C2406-3, Circuit VDB07 (VT/OG) And DLC C251-11, Circuit VDB07 (VT/OG), Harness Side
  Courtesy of FORD MOTOR CO.
  
  Are the resistances less than 5 ohms?
  1. Yes : CONNECT the negative battery cable. GO to AA4.
  2. No : REPAIR the circuit in question. CONNECT the negative battery cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
AA4 CHECK FOR CORRECT HSWM OPERATION
- Disconnect the HSWM connector.
- Check for:
  - corrosion
  - damaged pins
  - pushed-out pins
- Connect the HSWM connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
  Is the concern still present?
  1. Yes : INSTALL a new HSWM . REFER to WHEELS AND TIRES . CLEAR the DTCs. REPEAT the network test with the scan tool.
  2. 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 network test with the scan tool.