Pinpoint Test B: A Single/More Than One Door Lock Is Inoperative - Without Memory
Locks, Latches and Entry Systems
Pinpoint Tests
Pinpoint Test B: A Single/More Than One Door Lock Is Inoperative - Without Memory
Refer to Wiring Diagram Set 110, Power Door Locks for schematic and connector information. Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) supplies voltage to the lock all relay, the unlock driver door relay or unlock all relay based upon input from the door lock control switches, the Remote Keyless Entry (RKE) transmitter, or the keyless entry keypad. Upon a lock request, the SJB supplies voltage on circuit CPL11 (GY/BN) and ground on circuits CPL52 (VT/GY) and CPL51 (BU/GN). Upon an unlock request, the voltage 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 (part of the door latch)
- SJB
PINPOINT TEST B: A SINGLE/MORE THAN ONE DOOR LOCK IS INOPERATIVE - WITHOUT MEMORY
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. TEST the system for normal operation.
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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 for the door lock actuator in question. REFER to Front Door Latch Front Door Latch or Rear Door Latch Rear Door Latch. TEST the system for normal operation.
No
GO to B5.
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B5 CHECK CIRCUIT CPL51 (BU/GN) OR CIRCUIT CPL52 (VT/GY) FOR AN OPEN
- Disconnect: SJB C2280e.
- Measure the resistance between the inoperative door lock actuator, harness side and the SJB, 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. 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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