Pinpoint Test C: The Door Locks Operate Only One Way

Locks, Latches and Entry Systems







Pinpoint Test C: The Door Locks Operate Only One Way

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 circuits CPL42 (GY/YE) and CPL43 (VT/GY) for the lock and unlock requests. When the lock or unlock switch is pressed, the voltage signal is routed to ground. The door lock control switches are grounded through circuits GD134 (BK/VT) and GD139 (BK/YE). The door lock actuator output circuits CPL11 (GY/BN), CPL51 (BU/GN) and CPL52 (VT/GY) are at ground on circuit GD139 (BK/YE) through the SJB when the lock and unlock relays are not energized.

When the SJB receives a lock request through circuit CPL42 (GY/YE), the SJB processes the lock request and energizes the all lock relay, supplying voltage to circuit CPL11 (GY/BN) to lock the doors. Circuits CPL51 (BU/GN) and CPL52 (VT/GY) are at ground on circuit GD139 (BK/YE) through the SJB.

When the SJB receives an unlock request through circuit CPL43 (VT/GY), the SJB processes the unlock request and energizes the all unlock relay and driver unlock relay supplying voltage to circuits CPL51 (BU/GN) and CPL52 (VT/GY) to unlock the doors. Circuit CPL11 (GY/BN) is at ground on circuit GD139 (BK/YE) through the SJB.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Door lock control switch
- SJB



PINPOINT TEST C: THE DOOR LOCKS OPERATE ONLY ONE WAY

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

C1-C4:

C4-C5: