Pinpoint Test B: A Single/More Than One Door Lock Is Inoperative
Handles, Locks, Latches and Entry Systems
Pinpoint Test B: A Single/More Than One Door Lock Is Inoperative
Refer to Wiring Diagram Set 117, Remote Keyless Entry and Alarm for schematic and connector information Electrical Diagrams.
Normal Operation
The Battery Junction Box (BJB) fuse 6 (30A) provides voltage for the power lock/unlock system and the luggage compartment/liftgate release. The BCM (Body Control Module) has a dedicated ground for the power lock/unlock system. The BCM (Body Control Module) contains internal relays that are energized depending on input received from the door lock control switch, driver door lock cylinder and the Remote Keyless Entry (RKE) transmitters. Upon a lock request, the BCM (Body Control Module) supplies voltage on the all door lock circuit 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.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Door lock actuator (part of the door latch)
- BCM (Body Control Module)
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.
B1 CHECK THE ALL LOCK OUTPUT CIRCUIT FOR VOLTAGE
- Ignition OFF.
- Disconnect: Inoperative Door Lock Actuator.
- NOTE: The BCM (Body Control Module) 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:
Inoperative Door Lock Actuator Connector-Pin Circuit LH front C525-7 CPL11 (GY/BN) RH front C609-2 CPL11 (GY/BN) LH rear C705-7 CPL11 (GY/BN) RH rear C805-2 CPL11 (GY/BN)
Is the voltage momentarily greater than 10 volts?
Yes
GO to B2.
No
REPAIR circuit CPL11 (GY/BN) for an open. TEST the system for normal operation.
B2 CHECK THE UNLOCK OUTPUT CIRCUIT FOR VOLTAGE
- NOTE: The BCM (Body Control Module) 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:
Inoperative Door Lock Actuator Connector-Pin Circuit LH front C525-8 CPL51 (BU/GN) RH front C609-1 CPL13 (BN/GN) LH rear C705-8 CPL13 (BN/GN) RH rear C805-1 CPL13 (BN/GN)
Is the voltage momentarily greater than 10 volts?
Yes
INSTALL a new door latch. REFER to Front Door Latch Removal and Replacement or Rear Door Latch Removal and Replacement. TEST the system for normal operation.
No
GO to B3.
B3 CHECK THE UNLOCK OUTPUT CIRCUIT FOR AN OPEN
- Disconnect: BCM (Body Control Module) C2280C.
- Measure the resistance between the BCM (Body Control Module), harness side and the inoperative door lock actuator, harness side as follows:
BCM (Body Control Module) Connector-Pin Inoperative Door Lock Actuator Connector-Pin Circuit C2280C-7 LH front C525-8CPL51 (BU/GN) C2280C-3 RH front C609-1CPL13 (BN/GN) C2280C-3 LH rear C705-8CPL13 (BN/GN) C2280C-3 RH rear C805-1CPL13 (BN/GN)
Is the resistance less than 5 ohms?
Yes
GO to B4.
No
REPAIR the circuit in question for an open. TEST the system for normal operation.
B4 CHECK FOR CORRECT BCM (Body Control Module) OPERATION
- Disconnect all the BCM (Body Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the BCM (Body Control Module) 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 (Body Control Module). 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.