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Pinpoint Test B: A Single/More Than One Door Lock Is Inoperative




Locks, Latches and Entry Systems







Pinpoint Tests

Pinpoint Test B: A Single/More Than One Door Lock Is Inoperative

Refer to Wiring Diagram Set 117 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Remote Keyless Entry and Alarm for schematic and connector information. Diagrams By Number

Normal Operation

When the Smart Junction Box (SJB) receives a lock request from the door lock control switch, the SJB provides power to the door lock actuators through circuit CPL11 (GY/BN). Ground for the LH front door actuator is provided through circuit CPL51 (BU/GN) and ground for the remaining door lock actuators is provided through circuit CPL52 (VT/GY). When the SJB receives an unlock request, power and ground are reversed on the previously listed circuits.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Door lock actuator
- SJB



PINPOINT TEST B: A SINGLE/MORE THAN ONE DOOR LOCK IS INOPERATIVE

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

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B1 CHECK THE DOOR LATCH FOR BINDING


- Lock and unlock the inoperative door lock using the door lock rod.
- Does the door lock and unlock?

Yes
GO to B3.

No
GO to B2.

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B2 CHECK THE LOCK ROD FOR BINDING


- Operate the door lock rod manually while observing the door lock rod for any binding or if the rod is bent.
- Is the door lock rod bent or binding?

Yes
REPAIR as necessary. TEST the system for normal operation.

No
INSTALL a new door latch. REFER to Front Door Latch Front Door Latch or Rear Door Latch Rear Door Latch.

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B3 CHECK CIRCUIT CPL11 (GY/BN) FOR AN OPEN


- Ignition OFF.
- Disconnect: Inoperative Door Lock Actuator.
- NOTE: The SJB only supplies voltage to the actuator momentarily. It is important to monitor the meter while pressing the door lock control switch.
- While pressing the door lock control switch in the LOCK position, measure the voltage between the inoperative door lock actuator, harness side and ground as follows:









- Is the voltage momentarily greater than 10 volts?

Yes
GO to B4.

No
REPAIR the circuit. TEST the system for normal operation.

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B4 CHECK CIRCUIT CPL52 (VT/GY) OR CIRCUIT CPL51 (BU/GN) FOR VOLTAGE


- NOTE: The SJB only supplies voltage to the actuator momentarily. It is important to monitor the meter while pressing the door lock control switch.
- While pressing the door lock control switch in the UNLOCK position, measure the voltage between the inoperative door lock actuator, harness side and ground as follows:









- Is the voltage momentarily greater than 10 volts?

Yes
INSTALL a new door latch. REFER to Front Door Latch Front Door Latch or Rear Door Latch Rear Door Latch.

No
GO to B5.

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B5 CHECK CIRCUIT CPL51 (BU/GN) OR CIRCUIT CPL52 (VT/GY) FOR AN OPEN


- Disconnect: SJB C2280d.
- Measure the resistance between the SJB, harness side and the inoperative door lock actuator, harness side as follows:









- Is the resistance less than 5 ohms?

Yes
GO to B6.

No
REPAIR the circuit. TEST the system for normal operation.

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B6 CHECK FOR CORRECT SJB OPERATION


- Disconnect all the SJB connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SJB 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 SJB. 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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