U1513
DTC U1500, U1511, U1512, or U1513
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.
DTC Descriptors
DTC U1500 01
- Inter-Device Dedicated Bus 1 Short to Battery
DTC U1500 02
- Inter-Device Dedicated Bus 1 Short to Ground
DTC U1511 00
- Inter-device Dedicated Bus Lost Communication With Device 1
DTC U1512 00
- Inter-device Dedicated Bus Lost Communication With Device 2
Diagnostic Fault Information
Circuit/System Description
The driver door module (DDM) and the front passenger door module (FPDM) communicate with window regulator motors on the local interconnect network bus 1 and the local interconnect network bus 2 circuits respectively. The DDM LIN bus is connected to all window regulator motors on its side of the vehicle, while the FPDM LIN bus is connected to the other window regulator motors. Communication on this network is only between the door modules and the window regulator motors. The window regulator motors are in effect modules. The window regulator motors do not communicate on any other data bus; therefore the door modules, which also communicate on the low speed GMLAN serial data bus will perform all communication with each other. If the driver depresses any passenger side window switch on the driver window switch the DDM communicates the information to the FPDM for operation. These DTCs will set in the DDM for driver side concerns or the FPDM for passenger side concerns.
Conditions for Running the DTC
The system voltage is between 9-16 volts.
Conditions for Setting the DTC
U1511 00
* The local interconnect network bus circuit of the front window motor has an open/high resistance.
* The B+ circuit of the front window motor is open or shorted to ground.
* The ground circuit of the front window motor is open.
U1512 00
* The local interconnect network bus circuit of the rear window motor has an open/high resistance.
* The B+ circuit of the rear window motor is open or shorted to ground.
* The ground circuit of the rear window motor is open.
U1500 02
The local interconnect network bus circuit is a shorted to ground.
U1500 01
The local interconnect network bus circuit is a shorted to voltage.
Action Taken When the DTC Sets
U1511 00
The front window will operate.
U1512 00
The rear window will operate.
U1500
The individual LIN bus will be inoperative, causing all windows on one side of the vehicle to be inoperative.
Conditions for Clearing the DTC
* The current DTC will clear when the malfunction is no longer present.
* A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.
Diagnostic Aids
* Both DTC U1511 and U1512 will set if an open/high resistance in the local interconnect network bus circuit is between the door module and the first splice.
* Only 1 DTC (U1511 or U1512) will set if an open/high resistance in the local interconnect network bus circuit is between the splice and the window motor.
Reference Information
Schematic Reference
Door Control Module Schematics (Door Control Module Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Data Link Communications Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning)for scan tool information
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the appropriate front window motor.
2. Test for less than 2.0 ohms between the ground circuit terminal 4 and ground.
• If greater than the specified range, test the ground circuit for an open/high resistance.
3. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 1 and ground.
• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
4. Test for 5.5-7.0 volts between the LIN circuit terminal 6 and ground.
• If greater than the specified range, test the LIN circuit for a short to voltage. If the circuit tests normal, replace the applicable door module.
• If less than the specified range, test the LIN circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the applicable door module.
5. Ignition OFF, reconnect the harness connector at the window motor.
6. Ignition ON, command the appropriate power window UP/DOWN with a scan tool. The window should go UP/DOWN.
• If the window fails to go UP/DOWN, check the serial data circuit terminal 6 for a short to ground or an open/high resistance. If the circuit tests normal, replace the appropriate window motor.
7. If all circuits test normal, replace the door module.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
Control Module References (Programming and Relearning)for DDM or PDM replacement, setup, and programming