Test D: All Door Locks Are Inoperative From One Switch

PINPOINT TEST D: ALL DOOR LOCKS ARE INOPERATIVE FROM ONE SWITCH

D1:

Normal Operation
The smart junction box (SJB) sends voltage signals to the door lock control switches through circuits CPL27 (WH/BN) and CPL30 (BU/BN) for the lock and unlock requests, respectively. When the lock or unlock switch is pressed, the voltage signal is routed to ground. Ground for the LH door lock control switch is provided through circuit GD143 (BK/VT). Ground for the RH door lock control switch is provided through circuit GD138 (BK/WH).

Possible Causes
- Circuit GD138 (BK/WH) open
- Circuit GD143 (BK/VT) open
- Door lock control switch