Cellular Telephone Conversation Partner Does Not Hear You

/ 9-5 (9650) / 2011 / 3. Electrical System / Audio system with navigation / Fault diagnosis, fault symptoms / Cellular Telephone Conversation Partner Does Not Hear You

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Audio Signal Power	1	1	1	1
Audio Signal Low Reference	-	1	1	1
1. Cellular telephone conversation partner does not hear you

Circuit/System Description

The mobile telephone control module uses the microphone to allow driver communication with the cellular telephone. The cellular telephone is connected to the mobile telephone control module via Bluetooth.

Reference Information

Schematic Reference

Cellular Telephone Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Cellular Telephone Description and Operation

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Ignition ON, observe the scan tool Microphone Signal parameter. The reading should be between 2-5 V.

Circuit/System Testing

1.	Ignition OFF, disconnect the harness connector at the B24 cellular phone microphone.

2.	Ignition OFF, wait until all retained accessory power is OFF, test for less than 10 Ω between the low reference circuit terminal 1 or A (depending on vehicle) and ground, allowing up to 5 minutes for the circuit resistance to drop to its lowest reading.

3.	If greater than the specified range, test the circuit for an open/high resistance.

4.	Ignition ON, test for 9.5-10.5 V between the signal circuit terminal 2 or B (depending on vehicle) and ground.

5.	If less than the specified value, test the circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K82 mobile telephone control module.

6.	If greater than the specified range, test the circuit for a short to voltage. If the circuit tests normal, replace the K82 mobile telephone control module.

7.	If all circuits test normal, replace the B24 cellular phone microphone.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for module replacement, setup, and programming.

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