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 high speed serial data 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.
DTC Descriptors
This diagnostic procedure supports the following DTCs:
| • | DTC U1713 Loss of Driver Window Motor to Door Module High Speed Communication |
| • | DTC U1715 Loss of Right Front Passenger Window Motor to Door Module High Speed Communication |
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 DDM or the PFDM when the DDM or PFDM detects either of the following conditions:
| • | The power window high speed serial data circuit voltage is a constant low for 112 milliseconds while the window is not moving. |
| • | The power window high speed serial data circuit 1 kHz signal is active for a period of 112 milliseconds while the window is not moving. |
Action Taken When the DTC Sets
The DDM or 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 PFDM will clear the current DTC when either of the following occurs:
| • | The DDM, or the PFDM, detects that the power window high speed serial data circuit voltage is no longer low while the window is not moving. |
| • | The DDM, or the PFDM, detects that the power window high speed serial data circuit 1 kHz signal has returned to the inactive state while the window is not moving. |
Diagnostic Aids
When DTC U1713 is set , it usually indicates a failure of the power window high speed serial data circuit, however, if DTC U1713 is set only in history and there is no complaint or failure symptom present, clearing the DTC should be the only action necessary. Some vehicles may set DTC U1713 erroneously if a window is operated in one express direction, then suddenly reversed to the opposite express direction. This can occur when the window express direction is quickly reversed by the operator, or during a window reversal triggered by an object becoming trapped between the window glass and the window frame.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Moveable Window Schematics Connector End View Reference: Window Systems Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Does the voltage measure within the specified value? | 5-9 V | Go to Step 5 | Go to Step 3 |
3 | Test the power window high speed serial data circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 4 |
4 | Inspect for poor connections at the appropriate door module harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 6 |
5 | Inspect for poor connections at the appropriate window sensor/motor assembly harness connector. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 8 | Go to Step 7 |
6 | Replace the door module. Refer to Control Module References . Did you complete the replacement? | -- | Go to Step 8 | -- |
7 | Replace the inoperative window sensor/motor assembly. Refer to Front Side Door Window Regulator Replacement . Did you complete the replacement? | -- | Go to Step 8 | -- |
8 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
