GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2006 🢒 Canyon Pickup - 4WD 🢒 Accessories 🢒 Cellular Communication 🢒 OnStar Audio Malfunction

Test Description

The number below refers to the step number on the diagnostic table.

  1. If the cellular telephone voice low reference circuit is shorted to voltage the vehicle communication interface module has been damaged and requires replacement.

Step

Action

Yes

No

Schematic Reference: OnStar Schematics

Connector End View Reference: Cellular Communication Connector End Views

DEFINITION: This procedure is for diagnosing problems during OnStar® audio following a button press from the OnStar® button assembly.

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2
  1. Turn the ignition ON, with the engine OFF.
  2. Turn ON the radio.
  3. Set volume to a comfortable level.
  4. Press the OnStar® Center Call button.

Can the "Connecting to OnStar" message be heard playing through the audio system at all?

Go to Step 3

Go to Step 4

3

Test the audio common signal circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 8

4

Is any distortion heard?

Go to Step 6

Go to Step 5

5

Test the left audio signal circuit for a short to ground. 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

Test the left audio signal circuit for an open or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 10

Go to Step 7

7

Test the audio common signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 9

Go to Step 8

8

Inspect for poor connections at the harness connector of the vehicle communication interface module (VCIM). 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 9

9

Replace the VCIM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the repair?

Go to Step 10

--

10

Operate the system in order to verify the repair.

Did you find and correct the condition?

System OK

Go to Step 2