Pinpoint Test A: All Door Locks Are Inoperative
Locks, Latches and Entry Systems
Pinpoint Tests
Pinpoint Test A: All Door Locks Are Inoperative
Refer to Wiring Diagram Set 110, Power Door Locks for schematic and connector information. Diagrams By Number
Normal Operation
The SJB fuse 6 (20A) provides voltage for the power lock/unlock system. Ground for the power lock/unlock system is internal to the SJB. The SJB contains internal relays that are energized depending on input received.
When the SJB receives a lock request from the door lock control switch, the SJB provides voltage to the door lock actuators through circuit CPL11 (GY/BN). Ground for the LH front door actuator is provided through circuit CPL51 (BU/GN) and ground for the remaining door lock actuators is provided through circuit CPL52 (VT/GY). When the SJB receives an unlock request, voltage and ground are reversed on the previously listed circuits.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- SJB
PINPOINT TEST A: ALL DOOR LOCKS ARE INOPERATIVE
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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A1 VERIFY THE OPERATION OF BOTH DOOR LOCK CONTROL SWITCHES
- Press the lock and unlock button of both door lock control switches while observing the door lock operation.
- Are the door locks inoperative from both switches?
Yes
GO to A2.
No
Go To Pinpoint Test D. Pinpoint Test D: All Door Locks Are Inoperative From One Switch
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A2 RETRIEVE THE RECORDED SJB DTCs FROM THE CONTINUOUS AND ON-DEMAND SELF-TESTS
- Check for recorded SJB DTCs from the continuous and on-demand self-tests.
- Are DTCs B1300, B1982, B2250, B2574, B2575 or B2671 recorded?
Yes
For DTCs B2574 and B2575, Go To Pinpoint Test E. Pinpoint Test E: DTC B2574 Or B2575
For DTCs B1300, B1982, B2250, and B2671, Go To Pinpoint Test F. Pinpoint Test F: DTC B1300, B1982, B2250, Or B2671
No
GO to A3.
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A3 CHECK CIRCUIT CPL11 (GY/BN) FOR AN OPEN
- Ignition OFF.
- Disconnect: SJB C2280a.
- Disconnect: LH Front Door Lock Actuator C525.
- Measure the resistance between the LH front door lock actuator C525-1, circuit CPL11 (GY/BN), harness side and the SJB C2280a-4, circuit CPL11 (GY/BN), harness side.
- Is the resistance less than 5 ohms?
Yes
GO to A4.
No
REPAIR the circuit. TEST the system for normal operation.
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A4 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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