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Pinpoint Test Aa: DTC B126A:01

NOTE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
  1. AA1 CHECK THE RECORDED BCM DTCs FROM THE SELF-TEST 
    • Check the recorded results from the BCM  self-test.
    • Is DTC B126A:01 present? 
  2. AA2 CHECK THE LH DOOR LOCK CONTROL SWITCH 
    • Disconnect: LH Door Lock Control Switch C505.
    • Repeat the BCM  self-test.
    • Is DTC B126A:01 retrieved again? 
  3. AA3 CHECK THE RH DOOR LOCK CONTROL SWITCH 
    • Disconnect: RH Door Lock Control Switch C605.
    • Repeat the BCM  self-test.
    • Is DTC B126A:01 retrieved again? 
  4. AA4 CHECK THE LOCK INPUT CIRCUIT OR THE UNLOCK INPUT CIRCUIT FOR A SHORT TO GROUND 
    • Ignition OFF.
    • Disconnect: BCM  C2280C.
    • For Edge, measure the resistance between the RH Door Lock Control Switch C605-1, circuit CPK19 (BU/GN), harness side and ground; and between the RH Door Lock Control Switch C605-3, circuit CPK23 (YE/VT), harness side and ground.
      Fig 1: Identifying Measuring Resistance Between RH Door Lock Control Switch C605- 1And Ground Connector
      G06259712Courtesy of FORD MOTOR CO.
    • For MKX, measure the resistance between the RH Door Lock Control Switch C605-1, circuit CPK23 (YE/VT), harness side and ground; and between the RH Door Lock Control Switch C605-3, circuit CPK19 (BU/GN), harness side and ground.
      Fig 2: Identifying Measuring Resistance Between RH Door Lock Control Switch C605- 1And Ground Connector
      G06259712Courtesy of FORD MOTOR CO.
    • Are the resistances greater than 10,000 ohms? 
    • Yes:  GO to AA5  .
    • No:  REPAIR circuit CPK19 (BU/GN) or circuit CPK23 (YE/VT) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
  5. AA5 CHECK FOR CORRECT BCM OPERATION 
    • Disconnect all the BCM  connectors.
    • Check for:
      • corrosion
      • damaged pins
      • pushed-out pins
    • Connect all the BCM  connectors and make sure they seat correctly.
    • 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 . TEST the system for normal operation.
    • No:  The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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