For 1990-2009 cars

### Door Ajar Indicator System Components

The door ajar indicator system consists of the following components.

• | Driver door module (DDM)--GMLAN device that receives the switched input from the door ajar switches and communicates the status to the Instrument Panel Cluster (IPC)

• | Passenger front door module (PDM)--GMLAN device that receives the switched input from the door ajar switches and communicates the status to the Instrument Panel Cluster (IPC)

• | Left rear door module (LRDM)--GMLAN device that receives the switched input from the door ajar switches and communicates the status to the Instrument Panel Cluster (IPC)

• | Right rear door module (RRDM)--GMLAN device that receives the switched input from the door ajar switches and communicates the status to the Instrument Panel Cluster (IPC)

• | Driver information center (DIC)--Part of the Instrument Panel Cluster (IPC)

• | Integrated radio chassis (IRC)--GMLAN device that will provide an audible warning for the door ajar indicator system

• | Driver door ajar switch--Part of the door latch and provides a switched ground signal for both door ajar and door open

• | Passenger door ajar switch--Part of the door latch and provides a switched ground signal for both door ajar and door open

• | Left rear door ajar switch--Part of the door latch and provides a switched ground signal for both door ajar and door open

• | Right rear door ajar switch--Part of the door latch and provides a switched ground signal for both door ajar and door open

The door ajar indicator system function is to alert the vehicle operator when a vehicle door has inadvertently been left ajar or open. Failure of the door ajar indicator system does not affect door locks or any other vehicle system.

### Driver Door Ajar Switch

The DDM receives a discrete input from the driver door ajar switch. The IPC and IRC receive the status of the driver door from the DDM via GMLAN serial data. When the driver door is open/ajar and the vehicle is in any gear other than PARK, the driver information center (DIC) will display DRIVER DOOR AJAR. If the door is still ajar and the vehicles speed is greater than 4.8 km/h (3 mph) the DDM will send GMLAN serial data message to the IRC requesting 5 chimes to sound.

### Passenger Door Ajar Switch

The PDM receives a discrete input from the passenger front door ajar switch. The IPC and IRC receive the status of the passenger door from the PDM via GMLAN serial data. When the passenger door is open/ajar and the vehicle is in any gear other than PARK, the driver information center (DIC) will display PASSENGER DOOR AJAR. If the door is still ajar when the vehicles speed is greater than 4.8 km/h (3 mph) the PDM will send a GMLAN serial data message to the IRC requesting 5 chimes to sound.

### Left Rear Door Ajar Switch

The LRDM receives a discrete input from the left rear door ajar switch. The IPC and IRC receive the status of the left rear door from the LRDM via GMLAN serial data. When the left rear door is open/ajar and the vehicle is in any gear other than PARK, the driver information center (DIC) will display LEFT REAR DOOR AJAR. If the door is still ajar when the vehicles speed is greater than 4.8 km/h (3 mph) the LRDM will send a GMLAN serial data message to the IRC requesting 5 chimes to sound.

### Right Rear Door Ajar Switch

The RRDM receives a discrete input from the right rear door ajar switch. The IPC and IRC receive the status of the right rear door from the RRDM via GMLAN serial data. When the right rear door is open/ajar and the vehicle is in any gear other than PARK, the driver information center (DIC) will display RIGHT REAR DOOR AJAR. If the door is still ajar when the vehicles speed is greater than 4.8 km/h (3 mph) the RRDM will send a GMLAN serial data message to the IRC requesting 5 chimes to sound.