Theory Of Operation

WARNING: This page is about a different car, the 2025 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

Unlike the passenger ajar signals that function like traditional open/closed ajar switches, the Driver Door Latch has redundant switches and signals for diagnostic purposes. The two switches share a common sensor ground. The Powertrain Control Module (PCM) receives the state (open/closed) of each switch over the CAN Bus from the Drivers Door Module (DDM) or Body Control Module (BCM) depending on the vehicles configuration and which module the latches are hard-wired to. The PCM continuously monitors the functioning status of the Driver Door Ajar Switch states for the operation of certain features such as Electric Stop/Start (ESS).

For further information on the effect of this DTC to the operation of ESS, review ENGINE START/STOP (ESS) INOPERATIVE . Refer to: ENGINE STOP/START (ESS) SYSTEM INOPERATIVE .