The invention discloses a passenger car door lock control unit. The passenger car door lock control unit comprises an MCU. The MCU is connected with a system basis chip through an SPI bus and a RESET control line. The system basis chip is connected with the output end of a door lock relay through a force unlocking module. The SPI bus is used for transmitting set parameters of the MCU to the system basis chip and an MCU status signal. The RESET control line is used for transmitting a reset signal. The system basis chip is provided with an MCU status timing detection circuit and can provide a 5 V power source. The system basis chip can detect whether the MCU loses efficacy and provides an MCU reset signal. The system basis chip judges whether an unlocking signal is output to the force unlocking module according to whether the MCU loses efficacy and the ON gear status of an ignition switch. The invention further provides the other passenger car door lock control unit. Through the passenger car door lock control units, safe unlocking of a passenger car door lock can be ensured under the circumstance that the passenger car MCU loses efficacy.