U1716

DTC U1714 or U1716

Circuit Description

Express 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 front door module (PFDM) each supply battery voltage and ground to power their respective window sensors. The door modules and sensors communicate with each other via a power window high speed serial data circuit, and a power window low speed serial data 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 power window low speed serial data circuit is a unique 2-way serial data communications link between the door module and the sensor. State-of-health messages, position of the window glass in relationship to the distance traveled by the window, and direction in which the window is moving are communicated via this circuit.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

* DTC U1714 Loss of Driver Door Module to Window Motor Normal Speed Communication
* DTC U1716 Loss of Right Front Passenger Door Module to Window Motor Normal Speed Communication

Conditions for Running the DTC

The door modules 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 DDM or by the PFDM when the DDM or the PFDM has detected any of the following conditions:

* The door module cannot communicate with the sensor over the power window low speed serial data line.
* The power window low speed serial data line is open.
* The power window low speed serial data line is shorted to ground.
* The power window low speed serial data line is shorted to battery.
* The window sensor battery voltage circuit has failed.
* The window sensor low reference circuit has failed.

Action Taken When the DTC Sets

The DDM or the PFDM 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 or the PFDM will clear the current DTC when power window low speed serial data communications between the sensor and associated door module have returned to normal.

Diagnostic Aids

When DTC U1714 is set, a failure of the power window low speed serial data circuit is the probable cause. However, DTC U1714 may also be set if the window sensor has lost power. This could be due to a failure of the sensor battery voltage circuit, or a failure of the sensor ground circuit.

TEST

Step 1 - Step 13:

Step 14: