Pinpoint Test C: The Door Locks Operate Only One Way
Handles, Locks, Latches and Entry Systems
Pinpoint Tests
Pinpoint Test C: The Door Locks Operate Only One Way
Refer to Wiring Diagram Set 110, Power Door Locks for schematic and connector information. Diagrams By Number
Normal Operation
The Driver Door Module (DDM) sends voltage signals to the door lock control switches through the lock and unlock input circuits. When the lock or unlock switch is pressed, the corresponding voltage signal is routed to ground, signaling the DDM to lock or unlock the doors. The door lock control switches have a dedicated ground circuit.
- DTC B1309 (Power Door Lock Circuit Short To Ground) - a continuous and on-demand DTC that sets when the DDM detects a short to ground on the lock input circuit. This DTC may also set if the lock switch is pressed for longer than 2 minutes.
- DTC B1341 (Power Door Unlock Circuit Short To Ground) - a continuous and on-demand DTC that sets when the DDM detects a short to ground on the unlock input circuit. This DTC may also set if the unlock 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
- DDM
PINPOINT TEST C: THE DOOR LOCKS OPERATE ONLY ONE WAY
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 RECORDED DDM DTCs FROM THE SELF-TEST
- Check the recorded results from the DDM self-test.
- Is DTC B1309 or DTC B1341 present?
Yes
GO to C2.
No
GO to C5.
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C2 CHECK THE LH DOOR LOCK CONTROL SWITCH
- Disconnect: LH Door Lock Control Switch C505.
- Enter the following diagnostic mode on the scan tool: DDM Self-Test.
- Is DTC B1309 or DTC B1341 present?
Yes
LEAVE the switch disconnected. GO to C3.
No
INSTALL a new LH door lock control switch. REFER to Door Lock Control Switch Service and Repair. TEST the system for normal operation.
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C3 CHECK THE RH DOOR LOCK CONTROL SWITCH
- Disconnect: RH Door Lock Control Switch C605.
- Enter the following diagnostic mode on the scan tool: DDM Self-Test.
- Is DTC B1309 or DTC B1341 present?
Yes
LEAVE the switch disconnected. GO to C4.
No
INSTALL a new RH door lock control switch. REFER to Door Lock Control Switch Service and Repair. TEST the system for normal operation.
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C4 CHECK THE LOCK INPUT CIRCUIT OR UNLOCK INPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: DDM C501a.
- Ignition ON.
- For DTC B1309, measure the resistance between the DDM C501a-9, circuit 119 (PK/YE), harness side and ground.
- For DTC B1341, measure the resistance between the DDM C501a-10, circuit 120 (PK/LG), harness side and ground.
- Is the resistance greater than 10,000 ohms?
Yes
GO to C8.
No
REPAIR the circuit in question. CLEAR the DTCs. REPEAT the self-test.
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C5 VERIFY THE OPERATION OF BOTH DOOR LOCK CONTROL SWITCHES
- Ignition OFF.
- Press the lock and unlock button of both door lock control switches while observing the door lock operation.
- Do the door locks operate only one way from both switches?
Yes
GO to C7.
No
GO to C6.
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C6 CHECK THE LOCK INPUT OR UNLOCK INPUT CIRCUIT FOR AN OPEN (SINGLE SWITCH INOPERATIVE)
- Disconnect: Suspect Door Lock Control Switch.
- Unlock the doors from the working door lock control switch.
- Connect a fused jumper wire between the LH door lock control switch C505-1, circuit 119 (PK/YE), harness side and the LH door lock control switch C505-4, circuit 57 (BK), harness side; or between the RH door lock control switch C605-1, circuit 119 (PK/YE), harness side and the RH door lock control switch C605-4, circuit 57 (BK), harness side.
- Remove the jumper wire.
- Connect a fused jumper wire between the LH door lock control switch C505-3, circuit 120 (PK/LG), harness side and the LH door lock control switch C505-4, circuit 57 (BK), harness side; or between the RH door lock control switch C605-3, circuit 120 (PK/LG), harness side and the RH door lock control switch C605-4, circuit 57 (BK), harness side.
- Do the doors lock and unlock with the jumper wire?
Yes
REMOVE the jumper wire. INSTALL a new door lock control switch. REFER to Door Lock Control Switch Service and Repair. TEST the system for normal operation.
No
REMOVE the jumper wire. REPAIR the input circuit in question. TEST the system for normal operation.
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C7 CHECK THE LOCK INPUT OR UNLOCK INPUT CIRCUIT FOR AN OPEN (BOTH SWITCHES INOPERATIVE)
- Disconnect: LH Door Lock Control Switch C505.
- Disconnect: DDM C501a.
- If the doors do not lock, measure the resistance between the DDM C501a-9, circuit 119 (PK/YE), harness side and the LH door lock control switch C505-1, circuit 119 (PK/YE), harness side.
- If the doors do not unlock, measure the resistance between the DDM C501a-10, circuit 120 (PK/LG), harness side and the LH door lock control switch C505-3, circuit 120 (PK/LG), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to C8.
No
REPAIR the circuit in question. TEST the system for normal operation.
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C8 CHECK FOR CORRECT DDM OPERATION
- Disconnect all the DDM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the DDM 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 DDM. REFER to Driver Door Module (DDM) Service and Repair. 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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