Pinpoint Test Q: The Audio Input Jack Is Inoperative/Does Not Operate Correctly
Information and Entertainment System
Pinpoint Test Q: The Audio Input Jack Is Inoperative/Does Not Operate Correctly
Refer to Wiring Diagram Set 130, Audio System/Navigation for schematic and connector information [1][2]Diagrams By Number.
Normal Operation - Vehicles Without the SYNC System
Audio signals are sent from the audio input jack to the Audio Front Control Module (ACM). There are no external power or ground circuits to the audio input jack.
Vehicles With the SYNC System
Audio signals are sent from the audio input jack to the Accessory Protocol Interface Module (APIM). The signals are then sent to the ACM (Audio Front Control Module). There are no external power or ground circuits to the audio input jack.
- DTC B1D78:13 (Auxiliary Input: Circuit Open)- sets in continuous memory by the ACM (Audio Front Control Module) (vehicles without the SYNC system only) when an open is detected in the audio input jack circuitry for greater than 250 milliseconds.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Audio input jack
- APIM (Accessory Protocol Interface Module) (vehicles with the SYNC system)
- ACM (Audio Front Control Module) (vehicles without the SYNC system)
PINPOINT TEST Q : THE AUDIO INPUT JACK IS INOPERATIVE/DOES NOT OPERATE CORRECTLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
NOTE: Before carrying out this pinpoint test, make sure the MP3 device is operating correctly.
Q1 CHECK THE AUDIO INPUT JACK AUDIO
- Connect: Multi-Media Interface Tester.
- Using the Multi-Media Interface Tester, attempt to play an audio file using the audio input jack.
Does the file play correctly?
Yes
The system is operating correctly at this time. The concern may be with the customer device.
No
GO to Q2.
Q2 DETERMINE THE VEHICLE CONTENT
- Determine if the vehicle is equipped with the SYNC system.
Is the vehicle equipped with the SYNC system?
Yes
GO to Q3.
No
GO to Q4.
Q3 CHECK THE APIM (Accessory Protocol Interface Module) AUDIO OUTPUT
- Using the Multi-Media Interface Tester, attempt to play an audio file using either the Universal Serial Bus (USB) port or Bluetooth.
Is the audio output OK for the USB (Universal Serial Bus) port or Bluetooth?
Yes
GO to Q4.
No
GO to Pinpoint Test G Pinpoint Test G: Poor Quality/Distorted/No Sound - SYNC System.
Q4 CHECK THE AUDIO INPUT JACK CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: Audio Input Jack C2362.
- Disconnect: ACM (Audio Front Control Module) C290A (Vehicles Without the SYNC System) or APIM (Accessory Protocol Interface Module) C2383 (Vehicles With the SYNC System).
- Ignition ON.
- Measure the voltage between the audio input jack, harness side and ground as follows:
Positive Meter Lead Negative Meter Lead C2362-1 VME46 (BU/GN) Ground C2362-2 RME46 (WH/GN) Ground C2362-3 RME45 (YE/GN) Ground C2362-4 VME45 (BU) Ground
Is any voltage present?
Yes
REPAIR the circuit in question. TEST the system for normal operation.
No
GO to Q5.
Q5 CHECK THE AUDIO INPUT JACK CIRCUITS FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the audio input jack, harness side and the ACM (Audio Front Control Module) (or APIM (Accessory Protocol Interface Module) , if equipped with the SYNC system), harness side; and between the audio input jack, harness side and ground as follows:
Positive Meter Lead Negative Meter Lead Circuit C2362-1 C290A-6 or C2383-47, then ground VME46 (BU/GN) C2362-2 C290A-14 or C2383-48, then ground RME46 (WH/GN) C2362-3 C290A-8 or C2383-46, then ground RME45 (YE/GN) C2362-4 C290A-7 or C2383-45, then ground VME45 (BU)
Is the resistance less than 5 ohms between the audio input jack and the ACM (Audio Front Control Module) (or APIM (Accessory Protocol Interface Module) , if equipped with the SYNC system), and greater than 10,000 ohms between the audio input jack and ground?
Yes
GO to Q6.
No
REPAIR the circuit in question. TEST the system for normal operation.
Q6 ISOLATE THE AUDIO INPUT JACK
- Connect: ACM (Audio Front Control Module) C290A (Vehicles Without the SYNC System) or APIM (Accessory Protocol Interface Module) C2383 (Vehicles With the SYNC System).
- Install a known good audio input jack. Refer to Audio Input Jack .
- Connect: Multi-Media Interface Tester.
- Using the Multi-Media Interface Tester, attempt to play an audio file using the audio input jack.
Does the file play correctly?
Yes
The concern was caused by an inoperative audio input jack. The system is operating correctly at this time.
No
For vehicles without the SYNC system, GO to Q7.
For vehicles with the SYNC system, GO to Q8.
Q7 CHECK FOR CORRECT ACM (Audio Front Control Module) OPERATION
- Ignition OFF.
- Disconnect all the ACM (Audio Front Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the ACM (Audio Front Control Module) connectors and make sure they seat correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes
INSTALL a new ACM (Audio Front Control Module). REFER to Audio Control Module (ACM) . TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
Q8 CHECK FOR CORRECT APIM (Accessory Protocol Interface Module) OPERATION
- Ignition OFF.
- Disconnect the APIM (Accessory Protocol Interface Module) connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the APIM (Accessory Protocol Interface Module) connector and make sure it seats correctly.
- Wait 2 minutes for the APIM (Accessory Protocol Interface Module) to re-initialize.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes
INSTALL a new APIM (Accessory Protocol Interface Module). REFER to Accessory Protocol Interface Module (APIM) . TEST the system for normal operation.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.