GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 Yukon Denali 🢒 Body and Accessories 🢒 Cellular Communication 🢒 OnStar Button Malfunction

Test Description

The following numbers refer to the steps in the table.

  1. Check for proper operation of the OnStar® Center Button.

    2.

  2. Check for proper operation of the OnStar® Call Answer/Call End Button.

    3.

  3. Check for proper operation of the OnStar® Emergency Button.

    4.

  4. Determine OnStar® Button Assembly has the necessary power and signal circuits.

OnStar® Button Assembly Test

Step

Action

Value(s)

Yes

No

DEFINITION: This procedure is for diagnosing problems with the OnStar® Button Assembly.

1

Did you perform the OnStar® Diagnostic System Check?

--

Go to Step 2

Go to OnStar System Check

2

Did you check the Audio system for proper operation?

--

Go to Step 3

Go to Radio/Audio System Operation

3

  1. Turn ON the ignition, with the engine OFF.
  2. Activate the OnStar® Center Button.

Does "Connecting to OnStar®" play through the audio system?

--

Go to Step 4

Go to Step 6

4

  1. Turn ON the ignition, with the engine OFF.
  2. Activate the Call Answer/Call End button.

Does "OnStar® Request Ended" play through the audio system?

--

Go to Step 5

Go to Step 7

5

  1. Turn ON the ignition, with the engine OFF.
  2. Activate the Emergency button.

Does "Connecting to OnStar® Emergency" play through the audio system?

--

Go to Step 14

Go to Step 8

6
  1. Turn OFF the ignition.
  2. Disconnect the OnStar® Button Assembly.
  3. Measure the resistance between Keypad Power circuit and the Keypad Signal circuit.
  4. Activate the OnStar® Center Button.

Does the resistance measure near the specified value?

3.0 Kohms

Go to Step 9

Go to Step 12

7
  1. Turn OFF the ignition.
  2. Disconnect the OnStar® Button Assembly.
  3. Measure the resistance between Keypad Power circuit and the Keypad Signal circuit.
  4. Activate the OnStar® Call Answer/Call End Button.

Does the resistance measure near the specified value?

13 Kohms

Go to Step 9

Go to Step 12

8
  1. Turn OFF the ignition.
  2. Disconnect the OnStar® Button Assembly.
  3. Measure the resistance between Keypad Power circuit and the Keypad Signal circuit.
  4. Activate the OnStar® Emergency Button.

Does the resistance measure near the specified value?

1.5 Kohms

Go to Step 9

Go to Step 12

9

Measure the voltage at the OnStar® Keypad between Keypad Power circuit and the Keypad Signal circuit.

Does the voltage measure near the specified value?

3V

Go to Step 13

Go to Step 10

10

Test the Keypad Power circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the problem?

--

Go to Step 14

Go to Step 11

11

Test the Keypad Signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the problem?

--

Go to Step 14

Go to Step 13

12

Replace the OnStar® Three Button Assembly. Refer to OnStar Button Assembly Replacement .

Did you complete the replacement?

--

Go to Step 14

--

13

Replace the Vehicle Interface Unit (VIU). Refer to Vehicle Interface Unit and Vehicle Communication Unit Modules Replacement .

Did you complete the replacement?

--

Go to Step 14

--

14

Operate the system in order to verify the repair.

Did you correct the condition?

--

System OK

Go to Step 3