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 door module (PDM) each supply battery positive 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, which caused the setting of this DTC, is a unique two-way serial data communications link between the door module and the sensor. State-of-health messages, window switch command status, and the actual position of the window glass in relationship to the distance traveled by the window, are communicated via this circuit.
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 driver door module (DDM) when either the DDM, or the passenger door module (PDM) 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. |
If the failure has occurred to the passenger side window, the PDM relays the information to the DDM and the DDM then sets the DTC.
Action Taken When the DTC Sets
The DDM or the PDM 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 the power window low speed serial data communication between the DDM and its sensor, or the PDM and its sensor, have returned to normal.
Diagnostic Aids
When DTC U1714 or DTC U1716 are set, a failure of the power window low speed serial data circuit is the probable cause. However, DTC U1714 or U1716 may also be set if the window sensor has lost power. This could be due to a failure of the sensor battery positive voltage circuit, or a failure of the sensor ground circuit.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: Power Window Schematics | ||||
1 | Did you perform the Door Systems Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Does the voltage measure within the specified value? | 9.5-16.0 V | Go to Step 4 | Go to Step 3 |
3 | Measure the voltage between the sensor battery positive voltage circuit of the harness connector and a good ground. Does the voltage measure within the specified value? | 9.5-16.0 V | Go to Step 9 | Go to Step 8 |
4 | Measure the voltage between the power window low speed serial data circuit of the harness connector and a good ground. Does the voltage measure within the specified value? | 6.0-9.5 V | Go to Step 11 | Go to Step 5 |
5 | Was the voltage measured in step 4 greater than the specified value? | 6.0-9.5 V | Go to Step 7 | Go to Step 6 |
6 | Test the power window low speed serial data circuit of the window sensor for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 10 |
7 | Test the power window low speed serial data circuit of the window sensor for a short to battery. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 10 |
8 | Test the battery positive voltage circuit of the window sensor for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 10 |
9 | Test the low reference circuit of the window sensor for a high resistance, an open, or a short to battery. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 10 |
10 | Inspect for poor connections at the harness connector of the appropriate door module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 12 |
11 | Inspect for poor connections at the harness connector of the appropriate window sensor/motor assembly. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 14 | Go to Step 13 |
12 | Replace the inoperative door module. Refer to Door Control Module Replacement . Did you complete the replacement? | -- | Go to Step 14 | -- |
13 | Replace the inoperative window sensor/motor assembly. Refer to Front Side Door Window Regulator Replacement . Did you complete the replacement? | -- | Go to Step 14 | -- |
14 |
Does the DTC reset? | -- | Go to Step 2 | System OK |
