Pinpoint Test C: All Door Locks Are Inoperative From The Door Lock Control Switch
Handles, Locks, Latches and Entry Systems
Pinpoint Test C: All Door Locks Are Inoperative From The Door Lock Control Switch
Refer to Wiring Diagram Set 117, Remote Keyless Entry and Alarm for schematic and connector information Electrical Diagrams.
Normal Operation
The Body Control Module (BCM) sends a voltage signal to the door lock control switch. When the door lock control switch is pressed, the voltage signal is routed to ground, signaling the BCM (Body Control Module) to lock or unlock the doors. The BCM (Body Control Module) monitors the door lock actuator positions and either locks or unlocks the doors depending upon their current state. If the doors are locked and the switch is pressed, the BCM (Body Control Module) unlocks the doors. If the doors are unlocked and the switch is pressed, the BCM (Body Control Module) locks the doors. The door lock control switch is part of the Front Controls Interface Module (FCIM) and shares the same ground.
- DTC B108F:23 (Cabin Lock/Unlock Switch: Signal Stuck Low)- a continuous and on-demand DTC that sets when the BCM (Body Control Module) detects a short to ground from the door lock control switch input circuit. This DTC may also set if the door lock control switch is pressed for longer than 2 minutes.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Door lock control switch (part of the FCIM (Front Controls Interface Module))
- BCM (Body Control Module)
PINPOINT TEST C : ALL DOOR LOCKS ARE INOPERATIVE FROM THE DOOR LOCK CONTROL SWITCH
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
C1 CHECK THE OPERATION OF THE FCIM (Front Controls Interface Module)
- Operate the radio through the FCIM (Front Controls Interface Module).
Does the FCIM (Front Controls Interface Module) operate the radio?
Yes
GO to C2.
No
REFER to Accessories and Optional Equipment to DIAGNOSE the FCIM (Front Controls Interface Module).
C2 CHECK THE RECORDED BCM (Body Control Module) DTCs FROM THE SELF-TEST
- Check the recorded results from the BCM (Body Control Module) self-test.
Is DTC B108F:23 present?
Yes
GO to C3.
No
GO to C5.
C3 CHECK THE DOOR LOCK CONTROL SWITCH FOR A SHORT TO GROUND
- Disconnect: FCIM (Front Controls Interface Module) C2402.
- Enter the following diagnostic mode on the scan tool: Clear BCM (Body Control Module) DTCs.
- Enter the following diagnostic mode on the scan tool: BCM (Body Control Module) Self-Test.
Is DTC B108F:23 retrieved again?
Yes
GO to C4.
No
INSTALL a new FCIM (Front Controls Interface Module). TEST the system for normal operation.
C4 CHECK THE INPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: BCM (Body Control Module) C2280F.
- Measure the resistance between the FCIM (Front Controls Interface Module) C2402-6, circuit CPL75 (BN/WH), harness side and ground
Is the resistance greater than 10,000 ohms?
Yes
GO to C7.
No
REPAIR circuit CPL75 (BN/WH) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
C5 CHECK THE DOOR LOCK CONTROL SWITCH
- Ignition OFF.
- Disconnect: FCDIM (Front Control/Display Interface Module) C2402.
- Listen to the door locks while momentarily connecting a fused jumper wire between the FCIM (Front Controls Interface Module) C2402-6, circuit CPL75 (BN/WH), harness side and the FCIM (Front Controls Interface Module) C2402-5, circuit GD115 (BK/GY), harness side.
Do the doors lock and unlock with the jumper wire connected?
Yes
INSTALL a new FCIM (Front Controls Interface Module). TEST the system for normal operation.
No
GO to C6.
C6 CHECK THE INPUT CIRCUIT FOR AN OPEN
- Disconnect: BCM (Body Control Module) C2280F.
- Measure the resistance between the BCM (Body Control Module) C2280F-8, circuit CPL75 (BN/WH), harness side and the FCIM (Front Controls Interface Module) C2402-6, circuit CPL75 (BN/WH), harness side.
Is the resistance less than 5 ohms?
Yes
GO to C7.
No
REPAIR circuit CPL75 (BN/WH) for an open. TEST the system for normal operation.
C7 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.