U1713
CIRCUIT DESCRIPTIONExpress Up operation of the front door power windows is monitored and controlled by the front door modules and the window sensors. Each front door window motor has a window sensor mounted to it. The driver door module (DDM) and the passenger door module (DDM) each supply battery positive voltage and ground to power their respective window sensors. The door modules and sensors communicate with each other via a window sensor high speed communications circuit, and a window sensor normal speed communications circuit. The window sensor detects differences in the window motors electrical pulses to determine if there is an obstruction to the travel of the window glass. The door modules use the information generated by the sensors to disable the Express Up movement of a window, or reverse the direction of travel, in the event that a passenger, or other obstacle, has become trapped in it.
The window sensor high speed communications circuit is a unique one-way communications link between the sensor and the door module. The sensor uses a voltage signal, and also a 1 kHz signal, to transmit information, via this circuit, from the sensor to the door module.
CONDITIONS FOR RUNNING THE DTC
The door module must be powered and can not have B1327-Battery Voltage Low or B1328-Battery Voltage High set for this DTC to set.
CONDITIONS FOR SETTING THE DTC
The DTC will be set by the driver door module (DDM) when either the DDM, or passenger door module (DDM) detects either of the following conditions:
^ The window sensor high speed communications circuit voltage is a constant low for 112 milliseconds while the window is not moving.
^ The window sensor high speed communications circuit 1 kHz signal is active for a period of 112 milliseconds while the window is not moving.
If the failure has occurred to the passenger side window, the DDM relays the information to the DDM and the DDM then sets the DTC.
ACTION TAKEN WHEN THE DTC SETS
The DDM or DDM will not allow the Express Up function for that window to operate. All other window functions for that window will still operate.
CONDITIONS FOR CLEARING THE DTC
The DDM will clear the current DTC when either of the following occurs:
^ The DDM, or the DDM, detects that its window sensor high speed communications circuit voltage is no longer low while the window is not moving.
^ The DDM, or the DDM, detects that its window sensor high speed communications circuit 1 kHz signal has returned to the inactive state while the window is not moving.
DIAGNOSTIC AIDS
When DTC U1713 or DTC U1715 are set, a failure of the window sensor high speed communications circuit is the probable cause.
TEST
