Operation

OPERATION

The overhead power sliding door switch is mounted in the front overhead console of the vehicle. The switch has resistors in parallel of 1.76K ohms, 3.17K ohms and 15K ohms. When pressed, the switch will have a nominal resistance of 1.76K ohms for the right sliding door button, 3.76K ohms for the left sliding door button and when not pressed, the switch will have a nominal resistance of 15K ohms.

The status of the overhead power sliding door switches is continually monitored by the circuitry within the ElectroMechanical Instrument Cluster (EMIC) (also known as the Cab Compartment Node/CCN). The instrument cluster receives input messages from the overhead power sliding door switches over a hardwired connection. Whenever the instrument cluster receives an input from the overhead power sliding door switches it sends a function command signal to the selected Power Sliding Door Module (PSDM). This message from the cluster to the PSDM is delivered via the Controller Area Network (CAN) data bus.

When one of the PSDMs receives a command signal it checks the following:

- PRNDL Status
- Vehicle Speed Status
- Ignition Status
- Vehicle Theft Alarm Armed/Disarmed Status
- Sliding door Latch Status
- Sliding Door Full Open Status
- Ambient Temperature
- Door Lock Status
- Sliding Door Window Up/Down Status

If the appropriate conditions exist the PSDM will send a command signal to the selected Rear Door Control Module (RDCM) so the sliding door can be latched/unlatched as needed. This command signal is sent via the CAN data bus. Once the PSDM senses the latch function it will power the motor on the power sliding door drive assembly to open/close the sliding door as requested by the overhead power sliding door switches.

The hard wired circuits for the overhead power sliding door switches may be diagnosed using conventional diagnostic tools and procedures. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the electronic controls and communication between other modules and devices that provide some features of the power sliding door system. The most reliable, efficient, and accurate means to diagnose the overhead console switch bank or the electronic controls and communication related to the power sliding door system operation requires the use of a diagnostic scan tool.