U2153

DTC U2153

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 Descriptor
DTC U2153
- Navigation Electronic Control Unit (ECU) - VICS Communication Circuit




Circuit Description

The traffic information reciever is available on export vehicles only and is dealer installed. The traffic information reciever is supplied with battery voltage from the RADIO S-BAND/VICS fuse located in the body control module (BCM). The traffic information reciever communicates with the navigation radio over 3 circuits. These are the vehicle identification communication system (VICS) bus request signal circuit, the VCIS high (+) signal circuit, and the VCIS low (-) signal circuit. The traffic information reciever is supplied ground at ground G104.


Conditions for Running the DTC

* Ignition ON.
* Battery voltage must be between 9-16 volts.



Conditions for Setting the DTC

There is no response from the traffic information reciever module when queried by the navigation radio after successfully initializing the system.


The navigation radio does not receive information from the traffic information reciever module when the radio detects a power mode transition to ON.


Action Taken When the DTC Sets

The traffic information reciever selection is not available on the navigation system menu.


Conditions for Clearing the DTC

The condition responsible for setting the DTC no longer exists.


Reference Information
Schematic Reference

Radio/Navigation System Schematics (Radio/Navigation System Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Navigation System Description and Operation (Navigation System 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 traffic information reciever.
2. Ignition OFF, test for less than 5 ohms between the traffic information reciever ground circuit terminal 5 and ground.

• If greater than the specified range, test the ground circuit for and open/high resistance.

3. Verify that a test lamp illuminates between the B+ circuit terminal 3 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

4. Ignition ON, verify that a test lamp illuminates between the accessory voltage circuit terminal 4 and ground.

• If the test lamp does not illuminate, test the voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.

5. Connect the harness connector at the traffic information reciever.
6. Ignition OFF, disconnect the X3 harness connector at the radio.
7. Ignition ON, verify that a test lamp illuminates between the request signal circuit terminal 2 and ground.

• If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the traffic information reciever.

8. Verify that a test lamp illuminates between the high signal circuit terminal 3 and ground.

• If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the traffic information reciever.

9. Verify that a test lamp illuminates between the low signal circuit terminal 6 and ground.

• If the test lamp does not illuminate, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the traffic information reciever.

10. Verify that a test lamp illuminates between B+ and the drain wire circuit terminal 5 and ground.

• If the test lamp does not illuminate, test the drain wire circuit for a short to voltage or an open/high resistance. If the circuit tests normal, test or replace the traffic information reciever.

11. If all circuits test normal, replace the radio.



Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Refer to the dealer installation instructions for traffic information reciever replacement
* Control Module References (Programming and Relearning)for Radio replacement, setup, and programming