OnStar Call Center Unable to Configure OnStar (R) System

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Cadillac Escalade EXT. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Value(s)	Yes	No
Schematic Reference: OnStar Schematics DEFINITION: The OnStar® operator will advise the caller that they are unable to configure the OnStar® system as requested.
1	Did you perform the Cellular Communication Diagnostic System Check?	-	Go to Step 2	Go to Diagnostic System Check - Cellular Communication
2	Turn ON the ignition, with the engine OFF. Press the OnStar® call center button. Ask the OnStar® operator to configure the OnStar® system. Does the OnStar® operator advise the caller the OnStar® system cannot be configured?	-	Go to Step 3	Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS
3	Test the ignition 1 voltage circuit for an open. Refer to CIRCUIT TESTING and WIRING REPAIRS . Did you find and correct the condition?	-	Go to Step 10	Go to Step 4
4	Turn OFF the ignition. Disconnect the Vehicle Communications Unit (VCU). Turn ON the ignition, with the engine OFF. Measure the voltage from the ignition ON signal circuit to a good ground. Does the voltage measure near the specified value?	12 V	Go to Step 6	Go to Step 5
5	Test the ignition ON signal circuit for an open or short to ground. Refer to CIRCUIT TESTING and WIRING REPAIRS . Did you find and correct the condition?	-	Go to Step 10	Go to Step 7
6	Inspect for poor connections at the harness connector of the VCU. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS and CONNECTOR REPAIRS . Did you find and correct the condition?	-	Go to Step 10	Go to Step 8
7	Inspect for poor connections at the harness connector of the Vehicle Interface Unit (VIU). Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS and CONNECTOR REPAIRS . Did you find and correct the condition?	-	Go to Step 10	Go to Step 9
8	IMPORTANT: Perform the OnStar® setup procedure. Replace the VCU. Refer to OnStar Vehicle Communication Unit (VCU) Replacement .Did you complete the replacement?	-	Go to Step 10	-
9	IMPORTANT: Perform the OnStar® setup procedure. Replace the VIU. Refer to OnStar Vehicle Interface Unit (VIU) Replacement .Did you complete the replacement?	-	Go to Step 10	-
10	Operate the system in order to verify the repair. Did you correct the condition?	-	System OK	Go to Step 2