U1513
DTC U1500, U1511, U1512, or U1513
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC U1500 00
-
LIN Bus Fault
DTC U1511 00
-
Lost Communication With RCM
Diagnostic Fault Information
Circuit/System Description
The remote compass module (RCM) communicates with the body control module (BCM) utilizing a single wire LIN communication link. The BCM is the gateway for the GMLAN network. All data is communicated on the LIN bus, therefore there are only 3 circuits to the module as follows:
* Ground
* LIN bus
* Voltage
Conditions for Running the DTC
The system voltage is between 9-16 volts.
Conditions for Setting the DTC
* The local interconnect network bus circuit has an open/high resistance, short to ground, or a short to voltage.
* The ignition voltage circuit of the RCM is open or shorted to ground.
* The ground circuit of the RCM is open.
Action Taken When the DTC Sets
RCM will not operate
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.
Reference Information
Schematic Reference
* Instrument Cluster Schematics Instrument Cluster Schematics
* Data Communication Schematics Electrical Diagrams
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Description and Operation
* Driver Information Center (DIC) Description and Operation Description and Operation
* Data Link Communications Description and Operation Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
Verify that DTC B1433 is not set.
If DTC is set, refer to DTC B1433 B1433.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the RCM.
2. Test for less than 2.0 ohms between the ground circuit terminal 2 and ground.
• If greater than the specified range, test the circuit for an open/high resistance.
3. Ignition ON, engine running, verify a test lamp illuminates between the ignition voltage circuit terminal 1 and ground.
• If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal and the RCM fuse is open, replace the RCM
4. Test for 5.5-7.0 volts between the LIN circuit terminal 3 and ground.
• If greater than the specified range, test the LIN circuit for a short to voltage. If the circuit tests normal, replace the BCM.
• 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 BCM.
5. Ignition OFF, disconnect the harness connector X5 at the BCM.
6. Ignition OFF, test for less than 5.0 ohms between the run relay coil control circuit terminal 13 and ground.
• If greater than the specified range, test the circuit for an open/high resistance.
7. If all circuits test normal, replace the RCM.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
Control Module References Control Module References for BCM and RCM replacement, setup, and programming