Pinpoint Test L : The Door Locks Operate Only One Way

WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.

Refer to REMOTE KEYLESS ENTRY AND ALARM for schematic and connector information.

Normal Operation and Fault Conditions

REFER to: Handles, Locks, Latches and Entry Systems - System Operation and Component Description .

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Condition
BCM B126A:01	Drivers Door Interior Lock Switch: General Electrical Failure	Sets during an on-demand self-test if the BCM is receiving a lock or unlock request.
DDM B108F:23	Cabin Lock/Unlock Switch: Signal Stuck Low	Set by the DDM when a short to ground is detected from one of the door lock control switch input circuits.
PDM B108F:23	Cabin Lock/Unlock Switch: Signal Stuck Low	Set by the PDM when a short to ground is detected from one of the door lock control switch input circuits.

Possible Sources

Wiring, terminals or connectors
Door lock control switch
BCM (without passenger door one-touch windows)
DDM (with passenger door one-touch windows)
PDM (with passenger door one-touch windows)

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

L1 CHECK FOR DOOR LOCK SWITCH DIAGNOSTIC TROUBLE CODES (DTCS)
- Ignition ON.
- Using a diagnostic scan tool, perform the self-test for the following modules:
  - BCM (for vehicles without passenger door one-touch windows)
  - DDM (for vehicles with passenger door one-touch windows)
  - PDM (for vehicles with passenger door one-touch windows)
Is DTC B126A:01 set in the BCM or DTC B108F:23 set in the DDM or PDM?

Yes GO to L2

No GO to L4

L2 ISOLATE THE DOOR LOCK CONTROL SWITCH
- Ignition OFF.
- Disconnect: Suspect door lock control switch.
- Ignition ON.
- Using a diagnostic scan tool, perform the self-test for the following modules:
  - BCM (for vehicles without passenger door one-touch windows)
  - DDM (for vehicles with passenger door one-touch windows)
  - PDM (for vehicles with passenger door one-touch windows)
Is DTC B126A:01 set in the BCM or DTC B108F:23 set in the DDM or PDM?

Yes GO to L3

No INSTALL a new door lock control switch. REFER to: Front Door Lock Control Switch .

L3 CHECK THE DOOR LOCK CONTROL SWITCH INPUT CIRCUITS FOR A SHORT TO GROUND

Ignition OFF.

For DTC B126A:01 set in the BCM, Disconnect: BCM C2280F.

For DTC B108F:23 set in the DDM, Disconnect:
- DDM C501A.

For DTC B108F:23 set in the PDM, Disconnect:
- PDM C652A.

If DTC B126A:01 is set in the BCM, measure:

Positive Lead	Measurement / Action	Negative Lead
C2280F-20	Courtesy of FORD MOTOR COMPANY	Ground
C2280F-25	Courtesy of FORD MOTOR COMPANY	Ground

If DTC B108F:23 is set in the DDM, measure:

Positive Lead	Measurement / Action	Negative Lead
C501A-10	Courtesy of FORD MOTOR COMPANY	Ground
C501A-20	Courtesy of FORD MOTOR COMPANY	Ground

If DTC B108F:23 is set in the PDM, measure:

Positive Lead	Measurement / Action	Negative Lead
C652A-10	Courtesy of FORD MOTOR COMPANY	Ground
C652A-20	Courtesy of FORD MOTOR COMPANY	Ground

Are the resistances greater than 10, 000 ohms?

Yes	For the BCM, GO to L10 For the DDM, GO to L11 For the PDM, GO to L12

No	REPAIR the circuit in question.

L4 CHECK THE LOCK REQUEST INPUT CIRCUIT

Ignition OFF.

Disconnect: Suspect door lock control switch.

For the LHF door lock control switch, connect:

Lead 1	Measurement / Action	Lead 2
C541-2	Courtesy of FORD MOTOR COMPANY	C541-3

For the RHF door lock control switch, connect:

Lead 1	Measurement / Action	Lead 2
C632-4	Courtesy of FORD MOTOR COMPANY	C632-3

For the rear passenger door lock control switch (if equipped), connect:

Lead 1	Measurement / Action	Lead 2
C3813-3	Courtesy of FORD MOTOR COMPANY	C3813-1

Remove the fused jumper wire.

Do the doors lock?

Yes

GO to L7

No	* For vehicles without passenger door one-touch windows, GO to L5 . * For vehicles with passenger door one-touch windows, GO to L6 .

L5 CHECK THE LOCK REQUEST INPUT CIRCUIT FOR AN OPEN FOR VEHICLES WITHOUT PASSENGER DOOR ONE-TOUCH WINDOWS

Disconnect: BCM C2280F.

For the LHF door lock control switch, measure:

Positive Lead	Measurement / Action	Negative Lead
C541-2	Courtesy of FORD MOTOR COMPANY	C2280F-25

For the RHF door lock control switch, measure:

Positive Lead	Measurement / Action	Negative Lead
C632-4	Courtesy of FORD MOTOR COMPANY	C2280F-25

For the rear passenger door lock control switch (if equipped), measure:

Positive Lead	Measurement / Action	Negative Lead
C3813-3	Courtesy of FORD MOTOR COMPANY	C2280F-25

Is the resistance less than 3 ohms?

Yes

GO to L10

No	REPAIR the circuit.

L6 CHECK THE LOCK REQUEST INPUT CIRCUIT FOR AN OPEN FOR VEHICLES WITH PASSENGER DOOR ONE-TOUCH WINDOWS

Disconnect: DDM C501A for vehicles with a driver or rear passenger door lock control switch concern.

Disconnect: PDM C652A for vehicles with a passenger door lock control switch concern.

For the LHF door lock control switch, measure:

Positive Lead	Measurement / Action	Negative Lead
C541-2	Courtesy of FORD MOTOR COMPANY	C501A-20

For the RHF door lock control switch, measure:

Positive Lead	Measurement / Action	Negative Lead
C632-4	Courtesy of FORD MOTOR COMPANY	C652A-20

For the rear passenger door lock control switch (if equipped), measure:

Positive Lead	Measurement / Action	Negative Lead
C3813-2	Courtesy of FORD MOTOR COMPANY	C501A-20

Is the resistance less than 3 ohms?

Yes	* For a concern with the driver door lock control switch, GO to L11* For a concern with the passenger door lock control switch, GO to L12

No	REPAIR the circuit.

L7 CHECK THE UNLOCK REQUEST INPUT CIRCUIT

For the LHF door lock control switch, connect:

Lead 1	Measurement / Action	Lead 2
C541-4	Courtesy of FORD MOTOR COMPANY	C541-3

For the RHF door lock control switch, connect:

Lead 1	Measurement / Action	Lead 2
C632-2	Courtesy of FORD MOTOR COMPANY	C632-3

For the rear passenger door lock control switch (if equipped), connect:

Lead 1	Measurement / Action	Lead 2
C3813-2	Courtesy of FORD MOTOR COMPANY	C3813-1

Remove the fused jumper wire.

Do the doors unlock?

Yes	INSTALL a new door lock control switch. REFER to: Front Door Lock Control Switch .

No	* For vehicles without passenger door one-touch windows, GO to L8 . * For vehicles with passenger door one-touch windows, GO to L9 .

L8 CHECK THE UNLOCK REQUEST INPUT CIRCUIT FOR AN OPEN FOR VEHICLES WITHOUT PASSENGER DOOR ONE-TOUCH WINDOWS

Disconnect: BCM C2280F.

For the LHF door lock control switch, measure:

Positive Lead	Measurement / Action	Negative Lead
C541-4	Courtesy of FORD MOTOR COMPANY	C2280F-20

For the RHF door lock control switch, measure:

Positive Lead	Measurement / Action	Negative Lead
C632-2	Courtesy of FORD MOTOR COMPANY	C2280F-20

For the rear passenger door lock control switch (if equipped), measure:

Positive Lead	Measurement / Action	Negative Lead
C3813-2	Courtesy of FORD MOTOR COMPANY	C2280F-20

Is the resistance less than 3 ohms?

Yes

GO to L10

No	REPAIR the circuit.

L9 CHECK THE UNLOCK REQUEST INPUT CIRCUIT FOR AN OPEN FOR VEHICLES WITH PASSENGER DOOR ONE-TOUCH WINDOWS

Disconnect: DDM C501A for vehicles with a driver or rear passenger door lock control switch concern.

Disconnect: PDM C652A for vehicles with a passenger door lock control switch concern.

For the LHF door lock control switch, measure:

Positive Lead	Measurement / Action	Negative Lead
C541-4	Courtesy of FORD MOTOR COMPANY	C501A-20

For the RHF door lock control switch, measure:

Positive Lead	Measurement / Action	Negative Lead
C632-2	Courtesy of FORD MOTOR COMPANY	C652A-20

For the rear passenger door lock control switch (if equipped), measure:

Positive Lead	Measurement / Action	Negative Lead
C3813-2	Courtesy of FORD MOTOR COMPANY	C501A-20

Is the resistance less than 3 ohms?

Yes	For a concern with the passenger door lock control switch, GO to L12 For a concern with the driver or rear passenger (if equipped) door lock control switch, GO to L11

No	REPAIR the circuit.

L10 CHECK FOR CORRECT BCM (BODY CONTROL MODULE) OPERATION

Ignition OFF.

Disconnect and inspect all the BCM connectors.

Repair:
- Corrosion (clean module pins or install new connectors or terminals)
- Damaged or bent pins (install new terminals or pins)
- Pushed-out pins (install new pins as necessary)

Reconnect the BCM connectors. Make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable service articles: TSB, GSB, SSM, or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, Refer to BCM GUIDED ROUTINE TESTING

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

L11 CHECK FOR CORRECT DDM (DRIVER DOOR MODULE) OPERATION

Disconnect and inspect all the DDM connectors.

Repair:
- corrosion (install new connectors or terminals - clean module pins)
- damaged or bent pins - install new terminals pins
- pushed-out pins - install new pins as necessary

Reconnect the DDM connectors and make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable service articles: TSB, GSB, SSM, or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new DDM. REFER to: Driver Door Module (DDM) .

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.

L12 CHECK FOR CORRECT PDM (PASSENGER DOOR MODULE) OPERATION

Disconnect and inspect all the PDM connectors.

Repair:
- corrosion (install new connectors or terminals - clean module pins)
- damaged or bent pins - install new terminals pins
- pushed-out pins - install new pins as necessary

Reconnect the PDM connectors and make sure they seat and latch correctly.

Operate the system and determine if the concern is still present.

Is the concern still present?

Yes	CHECK OASIS for any applicable service articles: TSB, GSB, SSM, or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new PDM. REFER to: Passenger Door Module (PDM) .

No	The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues.