Pinpoint Test C: A Single Door Lock Is Inoperative
Handles, Locks, Latches and Entry Systems
Pinpoint Tests
Pinpoint Test C: A Single Door Lock Is Inoperative
Refer to Wiring Diagram Set 117, Remote Keyless Entry and Alarm for schematic and connector information. Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) fuse 35 (15A) supplies voltage to the lock all relay, the unlock driver door relay or unlock passenger door relay based upon input from the door lock control switches or the Remote Keyless Entry (RKE) transmitter. Upon a lock request, the SJB supplies voltage on the door lock circuits and ground on the driver and passenger door unlock circuits. Upon an unlock request, the voltage and ground are reversed on the previously listed circuits. When the door lock and unlock relays are not energized they are connected to ground. A dedicated SJB ground circuit is provided only for the lock and unlock relays.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Door lock actuator
- SJB
PINPOINT TEST C: A SINGLE 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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C1 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 C3.
No
GO to C2.
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C2 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.
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C3 CHECK THE LOCK CIRCUIT FOR VOLTAGE
- Ignition OFF.
- Disconnect: Suspect Door Lock Actuator Connector.
- 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 C4.
No
GO to C5.
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C4 CHECK THE UNLOCK CIRCUIT 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 lock actuator. REFER to Door Lock Actuator Service and Repair. TEST the system for normal operation.
No
GO to C5.
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C5 CHECK THE DOOR LOCK ACTUATOR CIRCUITS FOR AN OPEN
- Disconnect: SJB C2280b.
- Disconnect: SJB C2280c.
- Measure the resistance between the suspect door lock actuator, harness side and the SJB, harness side as follows:
- Are the resistances less than 5 ohms?
Yes
GO to C6.
No
REPAIR the circuit in question for an open. TEST the system for normal operation.
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C6 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. REFER to Body Control Systems. 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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