Pinpoint Test B: A Single Door Lock Is Inoperative
Locks, Latches and Entry Systems
Pinpoint Tests
Pinpoint Test B: A Single Door Lock is Inoperative
Refer to Wiring Diagram Set 110, Power Door Locks for schematic and connector information. Diagrams By Number
Normal Operation
The Bussed Electrical Center (BEC) fuse 62 (20A) provides voltage for the power lock/unlock system. Ground for the power lock/unlock system is provided by circuit 1205 (BK) to the Smart Junction Box (SJB). The SJB contains internal relays that are energized depending on input received.
When the SJB receives a door lock control switch lock command, the door lock relay is energized, supplying voltage to the door lock actuators through circuits 1328 (RD/OG) and 1383 (RD). The actuators are grounded through circuits 1329 (YE) and 1384 (LB). When the SJB receives an unlock request, the unlock relays are energized, supplying 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
- SJB
PINPOINT TEST B: A SINGLE 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 RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND SJB SELF-TESTS
- Check for recorded SJB DTCs from the continuous and on-demand self-tests.
- Are any DTCs recorded?
Yes
For DTCs B1300, B1310 and B1982, Go To Pinpoint Test F. Pinpoint Test F: DTC B1300, B1310, Or B1982
For all other DTCs, REFER to DTC Charts. Diagnostic Trouble Code Descriptions
No
GO to B2.
-------------------------------------------------
B2 CHECK THE DOOR LATCH FOR BINDING
- Lock and unlock the inoperative door lock using the door lock rod.
- Does the door lock and unlock?
Yes
GO to B4.
No
GO to B3.
-------------------------------------------------
B3 CHECK THE LOCK ROD FOR BINDING
- Operate the door lock rod manually while observing the door lock rod for any binding or if the rod is bent.
- Is the door lock rod bent or binding?
Yes
REPAIR as necessary. TEST the system for normal operation.
No
INSTALL a new door latch. REFER to Door Latch Door Latch. TEST the system for normal operation.
-------------------------------------------------
B4 CHECK CIRCUITS 1328 (RD/OG) AND 1383 (RD) FOR VOLTAGE
- Ignition OFF.
- Disconnect: Inoperative Door Lock Actuator.
- NOTE: The SJB 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 LH door lock actuator C525-1, circuit 1328 (RD/OG), harness side and ground; or between the RH door lock actuator C603-1, circuit 1383 (RD), harness side and ground.
- Is the voltage momentarily greater than 10 volts?
Yes
GO to B5.
No
GO to B6.
-------------------------------------------------
B5 CHECK CIRCUITS 1329 (YE) AND 1384 (LB) FOR VOLTAGE
- NOTE: The SJB 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 LH door lock actuator C525-2, circuit 1329 (YE), harness side and ground; or between the RH door lock actuator C603-2, circuit 1384 (LB), harness side and ground.
- Is the voltage momentarily greater than 10 volts?
Yes
INSTALL a new door lock actuator. REFER to Door Lock Actuator Service and Repair. TEST the system for normal operation.
No
GO to B6.
-------------------------------------------------
B6 CHECK THE DOOR LOCK ACTUATOR CIRCUITS FOR AN OPEN
- Disconnect: SJB C2280g (LH door inoperative).
- Disconnect: SJB C2280h (RH door inoperative).
- Measure the resistance between inoperative door lock actuator harness side and the SJB, harness side as follows:
- Are the resistances less than 5 ohms?
Yes
GO to B7.
No
REPAIR the circuit in question. TEST the system for normal operation.
-------------------------------------------------
B7 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.
-------------------------------------------------