Test H: DTC B1309, B1341, B2574, Or B2575: Lock/Unlock Circuit Short To Ground

PINPOINT TEST H: DTC B1309, B1341, B2574, OR B2575: LOCK/UNLOCK CIRCUIT SHORT TO GROUND

Normal Operation

With Memory
The smart junction box (SJB) supplies voltage and ground to all the passenger door lock actuators by controlling the lock all and unlock all relays. The driver door module (DDM) supplies voltage and ground only to the driver door lock actuator. The SJB receives inputs from the RH door lock control switch, keyless entry keypad, and the remote keyless entry (RKE) transmitter. The DDM only receives input from the LH door lock control switch. Both modules share the information obtained from the inputs over the medium speed controller area network (MS-CAN). Upon a lock request, the SJB supplies voltage on circuit CPL11 (GY/BN) and ground on CPL52 (VT/GY), and the DDM supplies voltage on CPL02 (VT/GN) and ground on CPL51 (BU/GN). Upon an unlock request, the voltage and ground are reversed on the previously listed circuits.

Without Memory
The SJB supplies voltage to the lock all relay, the unlock driver door relay or unlock all relay based upon input from the door lock control switches, the RKE transmitter, or the keyless entry keypad. Upon a lock request, the SJB supplies voltage on circuit CPL11 (GY/BN) and ground on circuits CPL52 (VT/GY) and CPL51 (BU/GN). Upon an unlock request, the 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 control switch
- DDM
- SJB

H1:

H2-H6:

H6-H8: