Pinpoint Test C: The Door Locks Operate Only One Way
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 door lock control switches provide a ground circuit GD179 (BK/VT) for the Smart Junction Box (SJB) lock and unlock signal circuits CPK19 (BU/GN) and CPK23 (YE/VT). The door lock actuator output circuits CPL11 (GY/BN), CPL13 (BN/GN) and CPL43 (VT/GY) are at ground on circuit GD179 (BK/VT) through the SJB when the lock and unlock relays are not energized.
When the SJB receives a lock request through circuit CPK19 (BU/GN), the SJB processes the lock request and energizes the all lock relay, supplying voltage to circuit CPL11 (GY/BN) to lock the doors. Circuits CPL13 (BN/GN) and CPL43 (VT/GY) are at ground on circuit GD179 (BK/VT) through the SJB.
When the SJB receives an unlock request through circuit CPK23 (YE/VT), the SJB processes the unlock request and energizes the all unlock relay and driver unlock relay supplying voltage to circuits CPL13 (BN/GN) and CPL43 (VT/GY) to unlock the doors. Circuit CPL11 (GY/BN) is at ground on circuit GD179 (BK/VT) through the SJB.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Door lock control switch
- SJB
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 SJB DTCs FROM THE SELF-TEST
- Check the recorded results from the SJB self-test.
- Is DTC B2A25 present?
Yes
Go To Pinpoint Test E. Pinpoint Test E: DTC B2A25
No
GO to C2.
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C2 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 C4.
No
GO to C3.
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C3 CHECK CIRCUIT CPK19 (BU/GN) (LOCK INPUT) OR CIRCUIT CPK23 (YE/VT) (UNLOCK INPUT) 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 CPK19 (BU/GN), harness side and the LH door lock control switch C505-4, circuit GD179 (BK/VT), harness side; or between the RH door lock control switch C605-1, circuit CPK19 (BU/GN), harness side and the RH door lock control switch C605-4, circuit GD179 (BK/VT), harness side.
- Remove the jumper wire.
- Connect a fused jumper wire between the LH door lock control switch C505-3, circuit CPK23 (YE/VT), harness side and the LH door lock control switch C505-4, circuit GD179 (BK/VT), harness side; or between the RH door lock control switch C605-3, circuit CPK23 (YE/VT), harness side and the RH door lock control switch C605-4, circuit GD179 (BK/VT), 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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C4 CHECK CIRCUIT CPK19 (BU/GN) (LOCK INPUT) OR CIRCUIT CPK23 (YE/VT) (UNLOCK INPUT) FOR AN OPEN (BOTH SWITCHES INOPERATIVE)
- Disconnect: LH Door Lock Control Switch C505.
- Disconnect: SJB C2280c.
- If the doors do not lock, measure the resistance between the SJB C2280c-17, circuit CPK19 (BU/GN), harness side and the LH door lock control switch C505-1, circuit CPK19 (BU/GN), harness side.
- If the doors do not unlock, measure the resistance between the SJB C2280c-4, circuit CPK23 (YE/VT), harness side and the LH door lock control switch C505-3, circuit CPK23 (YE/VT), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to C5.
No
REPAIR the circuit in question. TEST the system for normal operation.
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C5 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. 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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