GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 Yukon Denali 🢒 Body and Accessories 🢒 Cellular Communication 🢒 OnStar Call Center Lock/Unlock Commands Inoperative

Test Description

The following numbers refer to the steps in the table.

  1. This step inspects that the phone is presently capable of placing a call. It will also insure that the OnStar® system is properly configured.

    2.

  2. This step checks the "Horn Honk" command from the OnStar® Call Center.

    3.

  3. This step checks the "Lock" command from the OnStar® Call Center.

    4.

  4. This step checks the "Unlock" command from the OnStar® Call Center.

    5.

  5. This step checks the "Lights Flash" command from the OnStar® Call Center.

Step

Action

Value(s)

Yes

No

DEFINITION: This procedure determines the problem with the OnStar® Center Commands if they are inoperative. The vehicle must be in a area capable of transmitting and receiving cellular signals.

1

Did you perform the OnStar® Diagnostic System Check?

--

Go to Step 2

Go to OnStar System Check .

2

  1. Turn ON the ignition, with the engine OFF.
  2. Activate the OnStar® Call Center button.
  3. Activate the Call End button.

Is the repair complete?

--

Go to Step 3

--

3

  1. Turn ON the ignition, with the engine OFF.
  2. Activate the OnStar® Call Center button.
  3. Ask the OnStar® Call Center operator to command On and OFF the Horn.
  4. Activate the Call End button.

Does the Horn command On and OFF?

--

Go to Step 5

Go to Step 4

4

Activate the horn with the horn switch.

Does the Horn turn ON and OFF ?

--

Go to Step 11

Go to Horns System Check

5

  1. Turn ON the ignition, with the engine OFF.
  2. Activate the OnStar® Call Center button.
  3. Ask the OnStar® Call Center operator to command On and OFF the Locks.
  4. Activate the Call End button.

Does the Lock command On and OFF?

--

Go to Step 7

Go to Step 6

6

Activate the Lock switch.

Does the Lock turn ON and OFF?

--

Go to Step 12

Go to Power Door Locks System Check

7

  1. Turn ON the ignition, with the engine OFF.
  2. Activate the OnStar® Call Center button.
  3. Ask the OnStar® Call Center operator to command On and OFF the Locks.
  4. Activate the Call End button.

Does the Unlock command On and OFF?

--

Go to Step 9

Go to Step 8

8

Activate the Unlock switch.

Does the Unlock turn ON and OFF?

--

Go to Step 13

Go to Power Door Locks System Check

9

  1. Turn ON the ignition, with the engine OFF.
  2. Activate the OnStar® Call Center button.
  3. Ask the OnStar® Call Center operator to command On and OFF the Lights.
  4. Activate the Call End button.

Does the Lights command On and OFF?

--

Go to Step 16

Go to Step 10

10

Activate the Headlamp switch.

Do the Headlamps turn ON and OFF?

--

Go to Step 14

Go to Headlight System Check

11

Test the Horn Relay Control Circuit to the VIU. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the problem?

--

Go to Step 16

Go to Step 15

12

Test the Lock Relay Control Circuit to the VIU. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the problem?

--

Go to Step 16

Go to Step 15

13

Test the Unlock Relay Control Circuit to the VIU. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the problem?

--

Go to Step 16

Go to Step 15

14

Test the Headlamp Relay Control Circuit to the VIU. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the problem?

--

Go to Step 16

Go to Step 15

15

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

Did you complete the repair?

--

Go to Step 16

--

16

Operate the system in order to verify the repair.

Did you find and correct the condition?

--

Go to OnStar System Check

Go to Step 2