Pinpoint Test E: DTC B2A25
Handles, Locks, Latches and Entry Systems
Pinpoint Tests
Pinpoint Test E: DTC B2A25
Refer to Wiring Diagram Set 110, Power Door Locks for schematic and connector information. Diagrams By Number
Normal Operation
The Smart Junction Box (SJB) 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 SJB to lock or unlock the doors. The door lock control switches have a dedicated ground circuit.
- DTC B2A25 (Trim Panel Lock Switch Circuit Failure) - an on-demand DTC that sets when the SJB detects a short to ground from the lock or unlock request input circuits. This DTC can also set if either of the door lock control switches are pressed for longer than 2 minutes.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Door lock control switch
- SJB
PINPOINT TEST E: DTC B2A25
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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E1 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 E2.
No
GO to Symptom Chart - Electrical. Symptom Chart - Electrical
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E2 CHECK THE LH DOOR LOCK CONTROL SWITCH
- Disconnect: LH Door Lock Control Switch C505 .
- Repeat the SJB self-test.
- Is DTC B2A25 retrieved again?
Yes
LEAVE the switch disconnected. GO to E3.
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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E3 CHECK THE RH DOOR LOCK CONTROL SWITCH
- Disconnect: RH Door Lock Control Switch C605 .
- Repeat the SJB self-test.
- Is DTC B2A25 retrieved again?
Yes
LEAVE the switch disconnected. GO to E4.
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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E4 CHECK THE LOCK OR UNLOCK INPUT CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Disconnect: SJB C2280c .
- Measure the resistance between the SJB C2280c-17, circuit CPK19 (BU/GN), harness side and ground; and between the SJB C2280c-4, circuit CPK23 (YE/VT), harness side and ground.
- Are the resistances greater than 10,000 ohms?
Yes
GO to E5.
No
REPAIR circuit CPK19 (BU/GN) or circuit CPK23 (YE/VT) for a short to ground. CLEAR the DTCs. REPEAT the self-test.
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E5 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. REFER to Body Control Systems. 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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