Volt

Cellular Telephone Conversation Partner Cannot Be Heard

The mobile telephone control module sends the telephone call via a hardwired signal to the radio. The radio mutes the audio source and transmit the telephone call to the speakers.

Schematic Reference

Cellular Telephone Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Cellular Telephone Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Vehicle ON, radio ON, adjust the radio balance and fade to each speaker.

⇒	If any speaker does not operate properly, refer to Speaker Malfunction .

2. Vehicle ON, Command the Audio Tone test ON and OFF with the scan tool, verify that a test tone turns ON and OFF.

Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

1. Vehicle OFF, disconnect the X1 connector at the K82 Mobile Telephone Control Module and the X1 connector at the A11 Radio.
2. Vehicle ON, test for less than 0.3 V between the audio signal circuit terminal 6 X1 at the K82 Mobile Telephone Control Module and ground.

⇒	If greater than the specified range, test the audio signal circuit for a short to voltage.

3. Vehicle ON, test for less than 0.3 V between the audio signal circuit terminal 15 X1 at the K82 Mobile Telephone Control Module and ground.

⇒	If greater than the specified range, test the audio signal circuit for a short to voltage.

4. Test for infinite resistance between the audio signal circuit terminal 6 X1 at the K82 Mobile Telephone Control Module and ground.

⇒	If less than the specified range, test the audio signal circuit for a short to ground.

5. Test for infinite resistance between the audio signal circuit terminal 15 X1 at the K82 Mobile Telephone Control Module and ground.

⇒	If less than the specified range, test the audio signal circuit for a short to ground.

6. Test for less than 5 Ω between the audio signal circuit terminal 6 X1 at the K82 Mobile Telephone Control Module and the audio signal circuit terminal 20 X1 at the A11 Radio.

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

7. Test for less than 5 Ω between the audio signal circuit terminal 15 X1 at the K82 Mobile Telephone Control Module and the audio signal circuit terminal 6 X1 at the A11 Radio.

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

8. Test for infinite resistance between the shield ground circuit terminal 5 X1 at the K82 Mobile Telephone Control Module and audio signal circuit terminal 6 X1 and the audio signal circuit terminal 15 X1.

⇒	If less than the specified range, test short circuit between each signal circuit and the shield ground circuit.

9. If all circuits test normal, replace the K82 Mobile Telephone Control Module and verify that the customer concern is not still present.

⇒	If the customer concern is still present, replace the A11 Radio.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for mobile telephone control module replacement, programming and setup