GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2003 🢒 DeVille 🢒 Body and Accessories 🢒 Navigation Systems 🢒 DTC U2153

Circuit Description

The traffic information receiver (VICS) communicates with the navigation radio over three circuits. These are the traffic information signal (+) circuit, the traffic information signal (-) circuit and the traffic information request signal.

Conditions for Running the DTC
    • The vehicle must be equipped with the VICS. This system is available only on export vehicles (UE9) and is dealer installed.
    • The navigation radio must detect a power mode transition from OFF-ASLEEP to ON.
    • The navigation radio does not set this DTC if B1327 or B1328 is current.

Conditions for Setting the DTC

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

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

Action Taken When the DTC Sets

The VICS switch disappears from the navigation system menu.

Conditions for Clearing the DTC

The navigation radio receives a response from the VICS module.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Determines if the malfunction is present.

    2.

  2. Verifies that the DTC sets under normal operating systems.

Step

Action

Yes

No

1

Did you perform the Diagnostic System Check - Navigation System?

Go to Step 2

Go to Diagnostic System Check - Navigation System

2

  1. Use the scan tool to clear the DTC's.
  2. Disconnect the scan tool.
  3. Turn OFF the ignition.
  4. Open, then close driver door to cancel RAP.

    5. Important: Do not operate any vehicle system for one minute.

  5. Connect a scan tool.
  6. Turn ON the ignition with the engine OFF.
  7. Retrieve DTCs from the navigation radio.

Does the DTC reset?

Go to Step 3

Go to Diagnostic System Check - Navigation System

3

Test the traffic information signal (+) circuit for the following:

    • An open
    • A short to ground
    • A short to voltage
    • High resistance

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 4

4

Test the traffic information signal (-) circuit for the following:

    • An open
    • A short to ground
    • A short to voltage
    • High resistance

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 5

5

Test the traffic information request signal circuit for the following:

    • An open
    • A short to ground
    • A short to voltage
    • High resistance

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 6

6

Inspect for poor connections at the harness connectors of the traffic information receiver (VICS). 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 10

Go to Step 7

7

Inspect for poor connections at the harness connectors of the navigation radio. 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 10

Go to Step 8

8

Replace the VICS. Refer to the VICS dealer installation instructions.

Did you find and correct the condition?

Go to Step 10

Go to Step 9

9

Replace the navigation radio. Refer to Radio Replacement in Entertainment.

Did you complete the repair?

Go to Step 10

--

10
  1. Use the scan tool to clear the DTCs.
  2. Operate the vehicle as specified within the Conditions for Running the DTC in the supporting text.

Does the DTC reset?

Go to Step 2

System OK