Pinpoint Test E: DTC B2A25

Handles, Locks, Latches and Entry Systems

Pinpoint Test E: DTC B2A25


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 (Smart Junction Box) 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 (Smart Junction Box) 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 (Smart Junction Box)

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.

E1 CHECK THE RECORDED SJB (Smart Junction Box) DTCs FROM THE SELF-TEST

- Check the recorded results from the SJB (Smart Junction Box) self-test.

Is DTC B2A25 present?

Yes
GO to E2.

No
GO to Symptom Chart - Electrical. Symptom Related Diagnostic Procedures

E2 CHECK THE LH DOOR LOCK CONTROL SWITCH

- Disconnect: LH Door Lock Control Switch C505.

- Clear the DTCs. Repeat the SJB (Smart Junction Box) 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 - Front Door Door Lock Control Switch - Front Door. TEST the system for normal operation.

E3 CHECK THE RH DOOR LOCK CONTROL SWITCH

- Disconnect: RH Door Lock Control Switch C629.

- Clear the DTCs. Repeat the SJB (Smart Junction Box) self-test.

Is DTC B2A25 retrieved again?

Yes
For cutaway vehicles, LEAVE the switch disconnected. GO to E5.

For all others, LEAVE the switch disconnected. GO to E4.

No
INSTALL a new RH door lock control switch. REFER to Door Lock Control Switch - Front Door Door Lock Control Switch - Front Door. TEST the system for normal operation.

E4 CHECK THE REAR DOOR LOCK CONTROL SWITCH

- Disconnect: Rear Door Lock Control Switch C4121.

- Clear the DTCs. Repeat the SJB (Smart Junction Box) self-test.

Is DTC B2A25 retrieved again?

Yes
LEAVE the switch disconnected. GO to E5.

No
INSTALL a new rear door lock control switch. REFER to Door Lock Control Switch - Rear Door Door Lock Control Switch - Rear Door. TEST the system for normal operation.

E5 CHECK THE LOCK OR UNLOCK INPUT CIRCUIT FOR A SHORT TO GROUND

- Ignition OFF.

- Disconnect: SJB (Smart Junction Box) C2280C.

- Measure the resistance between the SJB (Smart Junction Box) C2280C-17, circuit CPL42 (GY/YE), harness side and ground; and between the SJB (Smart Junction Box) C2280C-4, circuit CPL43 (VT/GY), harness side and ground.





Are the resistances greater than 10,000 ohms?

Yes
GO to E6.

No
REPAIR the circuit in question for a short to ground. CLEAR the DTCs. REPEAT the self-test.

E6 CHECK FOR CORRECT SJB (Smart Junction Box) OPERATION

- Disconnect all the SJB (Smart Junction Box) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the SJB (Smart Junction Box) 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 (Smart Junction Box). 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.