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 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, and voltage and ground are reversed on the previously listed circuits.
- DTC B1301 (Power Door Lock Circuit Open) - a continuous or on-demand DTC that sets if the SJB detects an open on ground circuit 1205 (BK).
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.
NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery.
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A1 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 DTC B1301, GO to A3.
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 A2.
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A2 VERIFY THE OPERATION OF THE LEFT AND RIGHT DOOR LOCK CONTROL SWITCHES
- Press the lock and unlock button of both the left and the right door lock control switches while observing the door lock operation.
- Are the door locks inoperative from both switches?
Yes
GO to A3.
No
Go To Pinpoint Test D. Pinpoint Test D: All Door Locks Are Inoperative From One Switch
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A3 CHECK CIRCUIT 1205 (BK) FOR AN OPEN
- Disconnect: Negative Battery Cable.
- Ignition OFF.
- Disconnect: SJB C2280a.
- Measure the resistance between the SJB C2280a-1, circuit 1205 (BK), harness side and ground.
- Is the resistance less than 5 ohms?
Yes
GO to A4.
No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
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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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