DTC B1114 (without UE1)

Cellular, Entertainment, and Navigation | Diagnostic Information and Procedures | Document ID: 5191714 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. DTC Descriptors DTC B1114 Cellular Telephone Microphone Signal Symptom Byte Information: Symptom Byte List Diagnostic Fault Information

Circuit	Circuit Function	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performan
655	Signal	B1114 11	B1114 13	—	—
654	Low Reference	—	B1114 13	—	—

Circuit/System Description The A11 Radio provides the B24LF Mobile Telephone Microphone – Left Front or the B24 Mobile Telephone Microphone (depending on radio RPO) with a supplied voltage on the cellular phone microphone high signal circuit 655. When the microphone is in use, voice data from the user is sent back to the A11 Radio on the cellular microphone low reference circuit 654. Conditions for Running the DTC Vehicle in Service Mode. The system voltage is between 9 V and 16 V. All the above conditions are present for greater than 5 s. Conditions for Setting the DTC B1114 11 Circuit 655 is shorted to ground for 250 ms or greater. B1114 13 The following conditions will set this DTC: Circuit 655 has an open/high resistance for 750 ms or greater. Circuit 654 has an open/high resistance for 750 ms or greater.. Action Taken When the DTC Sets The A11 Radio will not receive a signal from the cellular phone microphone. Calls can be placed but the caller cannot be heard. Conditions for Clearing the DTC The condition responsible for setting the DTC no longer exists. A history DTC will clear once 100 consecutive malfunction-free ignition cycles have occurred. Reference Information Schematic Reference Radio/Navigation System Schematics Connector End View Reference Master Electrical Component List Description and Operation Radio/Audio System 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 Testing

1. Ignition/vehicle OFF, disconnect the harness connector at the appropriate B24 Mobile Telephone Microphone, ignition ON/vehicle in service mode.
2. Test for 8-11 V between the signal circuit terminal 2 and ground. ⇒ If less than 8 V 2.1. Test circuit 655 for a short to ground. ⇒ If a short to ground is found, repair the fault on the circuit. ⇓ If a short to ground is not found. 2.2. Test circuit 655 for an open/high resistance. ⇒ If an open/high resistance is found, repair the fault on the circuit. ⇓ If an open/high resistance is not found. 2.3. Replace the A11 Radio. ⇒ If greater than 11 V 2.1. Test circuit 655 for a short to voltage. ⇒ If a short to voltage is found, repair the fault on the circuit. ⇓ If a short to voltage is not found. 2.2. Replace the A11 Radio. ⇓ If between 8-11 V
3. Test for less than 1 V between the low reference circuit terminal 1 and ground. ⇒ If greater than 1 V 3.1. Test circuit 654 for a short to voltage. ⇒ If a short to voltage is found, repair the fault on the circuit. ⇓ If a short to voltage is not found. 3.2. Replace the A11 Radio. ⇓ If less than 1 V
4. Test for greater than 8 V between the signal circuit terminal 2 and the low reference circuit terminal 1. ⇒ If less than 8 V 4.1. Test circuit 654 for an open/high resistance in the circuit. ⇒ If an open/high resistance is found, repair the fault on the circuit. ⇓ If an open/high resistance is not found. 4.2. Replace the A11 Radio. ⇓ If greater than 8 V
5. Replace the appropriate B24 Mobile Telephone Microphone. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Mobile Telephone Microphone Replacement For control module replacement, programming, and setup refer to: Control Module References