2010 Cadillac CTS Sedan AWD V6-3.6L Page 482

2010 Cadillac CTS Sedan AWD V6-3.6L Page 482

5. If all circuits test normal, replace the T4 cellular phone and navigation antenna.

Component Testing

Caution: Refer to Test Probe Caution (See: Service Precautions/Vehicle Damage Warnings/Test Probe Caution).

Note: Before testing the coax cable, check the cable exterior for being pinched, cut, damaged, or having loose connections at the components,

which can cause reception issues.

To prevent false reading when testing the center coax terminals, use care not to ground the test probe on the outer housing/shield.

Coax Cable Test

1. Ignition OFF, disconnect the GPS and cellular phone coax cable at both components.

2. Test both for less than 5 ohm between both ends of the coax cables center terminals.

瀚慖f greater than the specified range, replace the failed coax cable.

3. Test for greater than 10k ohm between the coax cable center wire and the outer coax shield.

瀚慖f less than the specified range, replace the coax cable.

Repair Instructions

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

* DTC B2462 (Communication Interface Module) DTC B2462 (Navigation Radio) (See: B Code Charts/B2462)

* Control Module References (See: Testing and Inspection/Programming and Relearning) for telematics communication interface control

module replacement, setup, and programming

Navigation Radio

DTC B2462 (Navigation Radio)

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) provides an overview of each diagnostic category.

DTC Descriptors

DTC B2462 02

- Global Positioning System (GPS) Short to Ground

DTC B2462 04

- Global Positioning System (GPS) Open Circuit

Circuit Description

The global positioning system (GPS) antenna is connected to the navigation radio by a coaxial cable. The antenna cable also provides a path for DC

current for powering the antenna.

Conditions for Running the DTC

* Radio ON

* Battery voltage between 9-16 volts

* The navigation radio tests the GPS antenna every 10 seconds

Conditions for Setting the DTC

B2462 02

The navigation radio detects a short to ground in the GPS antenna signal circuit.