Test Description

WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

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

2: This step tests the condition of the cellular antenna.
3: This step tests the condition of the cellular antenna coax and for proper ground of the cellular antenna.

DTC B2470

Step	Action	Value	Yes	No
Schematic Reference: OnStar Schematics Connector End View Reference: Cellular Communication Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2	Inspect the cellular antenna assembly for damage. Is the antenna assembly damaged?	-	Go to Step 7	Go to Step 3
3	IMPORTANT: Vehicle may be equipped with sectioned coax. Test each section and replace only the faulty section, not the entire length of coax. Disconnect the cellular antenna coax from the vehicle communication interface module (VCIM). Measure the resistance between the center conductor and the outer metal shield. Does the meter read out of limits?	-	Go to Step 4	Go to Step 5
4	Disconnect the cellular antenna coax from the cellular antenna assembly. Measure the resistance of the cellular antenna coax center conductor from end to end. Does the resistance measure greater than the specified value?	1 Ω	Go to Step 8	Go to Step 6
5	Inspect for poor connections at the harness connector of the VCIM. Refer to Testing for Intermittent Conditions and Poor Connections andConnector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 10	Go to Step 9
6	Inspect for poor connections at the harness connector of the cellular antenna. 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	Replace the cellular antenna. Refer to Antenna Replacement - Cellular Communications . Did you complete the replacement?	-	Go to Step 10	-
8	Replace the cellular antenna coax. Did you complete the replacement?	-	Go to Step 10	-
9	Replace the Vehicle Communication Interface Module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 10	-
10	Use the scan tool in order to clear the DTCs. Operate the vehicle within the conditions for running the DTC as specified in the supporting text. Does the DTC reset?	-	Go to Step 2	System OK