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Mobile Telephone Microphone Malfunction

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 provide an overview of each diagnostic category.

Circuit/System Description

Without Navigation Radio

The mobile telephone control module uses the mobile telephone microphone to allow driver communication with mobile telephone.

With Navigation Radio

The mobile telephone control module and navigation radio use the mobile telephone microphone to allow driver communication with a mobile telephone, as well as to operate the voice recognition guidance feature of the navigation radio.

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

Circuit/System Testing

Without Navigation Radio

  1. Vehicle OFF, disconnect the harness connector at the B24 Mobile Phone Microphone.
  2. Vehicle OFF, test for less than 5 Ω between the low reference circuit terminal 2 and ground.
    3. ⇒If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K82 Mobile Telephone Control Module.
  3. Vehicle ON, test for 9-11 V between the signal circuit terminal 3 and ground.
    4. ⇒If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K82 Mobile Telephone Control Module.
    ⇒If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K82 Mobile Telephone Control Module.
  4. If all circuits test normal, replace the B24 Mobile Telephone Microphone.

With Navigation Radio

  1. Vehicle OFF, disconnect the X4 harness connector at the navigation radio and the harness connector at the B24 Mobile Phone Microphone.
  2. Vehicle OFF, test for less than 5 Ω between the low reference circuit terminal 2 and ground.
    3. ⇒If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K82 Mobile Telephone Control Module.
  3. Vehicle ON, test for 9-11 V between the signal circuit terminal 3 and ground.
    4. ⇒If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K82 Mobile Telephone Control Module.
    ⇒If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K82 Mobile Telephone Control Module.
  4. If all circuits test normal, replace the B24 Mobile Telephone Microphone.
    5. ⇒If condition still exists, replace the navigation radio.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Mobile Telephone Microphone Replacement
    • Control Module References for mobile telephone control module or navigation radio replacement, programming and setup
   


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