2010 Cadillac CTS Sedan AWD V6-3.6L Page 489

2010 Cadillac CTS Sedan AWD V6-3.6L Page 489

瀚慖f less than the specified range, test the keypad signal circuit for a short to ground. If the circuit tests normal, replace the CIM.

瀚慖f greater than the specified range, test the keypad signal circuit for an open/high resistance. If the circuit tests normal, replace the CIM.

5. Ignition ON, test for 9.5-10.5 V between the keypad supply voltage circuit terminal 12 and ground.

瀚慖f less than the specified range, test the supply voltage circuit for a short to ground or open/high resistance. If the circuit tests normal,

replace the CIM.

瀚慖f greater than the specified range, test the supply voltage circuit for a short to voltage. If the circuit tests normal, replace the CIM.

6. If all circuits test normal, test or replace the button assembly.

Repair Instructions

Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.

* Inside Rearview Mirror Replacement (See: Body and Frame/Mirrors/Service and Repair/Inside Rearview Mirror Replacement)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for CIM replacement, setup, and programming

B2485

DTC B2485

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provide an overview of each diagnostic category.

DTC Descriptors

DTC B2485 02

- Wireless Communication Antenna Circuit Short to Ground

DTC B2485 04

- Wireless Communication Antenna Circuit Open Circuit

Circuit/System Description

The Bluetooth (R) antenna is a small fixed antenna connected directly to the communication interface module (CIM) and is used to send and

receive signals from a Bluetooth (R) enabled cellular phone. The antenna utilizes no cabling and is not external to the vehicle.

Conditions for Running the DTC

* Ignition ON.

* Battery voltage must be between 9-16 V.

* The CIM tests the antenna once every second.

Conditions for Setting the DTC

B2485 02

The CIM detects a short to ground in the Bluetooth (R) antenna.

B2485 04

The CIM detects an open/high resistance in the Bluetooth (R) antenna.

Actions Taken When the DTC Sets

* The OnStar (R) status LED turns red.

* Bluetooth (R) functionality is disabled.

Conditions for Clearing the DTC

* The condition responsible for setting the DTC no longer exists.