Power Door Lock Switch: Description and Operation

POWER DOOR LOCK SWITCHES

The RH front power door lock switch is wired directly to the passenger door module (PDM). The normally open contacts of the switch are supplied battery voltage and ground by the PDM. The switch has two circuits for battery voltage, one for a lock signal and one for an unlock signal. The PDM supplies ground to the switch via a third circuit. When the switch is activated for a lock or unlock function, the switch contacts for that function are closed, the voltage supplied to the corresponding circuit is pulled low in the PDM, and the PDM recognizes the flow of voltage as a lock switch input signal. The PDM then sends a message to the DDM over the power door serial data link indicating the switch activity.

The LH front power door lock switch is similar to the passenger door switch and works the same way. However, the LH lock switch is wired directly to the driver door switch assembly (DDSA) for power, and to a ground stake for ground. The lock switch signal information is processed by the DDSA. The LH lock switch also operates on less voltage. The DDSA supplies two 5 volt circuits to the lock switch, one for a lock signal and one for an unlock signal. When the switch is activated for a lock or unlock function, the switch contacts for that function are closed, the voltage supplied to the corresponding circuit is pulled low in the DDSA, and the DDSA recognizes the flow of voltage as a lock switch input signal. The DDSA then sends a message to the DDM over the power door serial data link indicating the switch activity.

The rear doors have no power lock switches, only manual lock levers.

When either the left or right front power door lock switch is activated, all of the doors are locked or unlocked in unison. The manual key locks and lock levers will still work if electrical power is lost.