Pinpoint Test K: Poor Reception/Poor Sound Quality/No Sound - Satellite Radio
Information and Entertainment System
Pinpoint Test K: Poor Reception/Poor Sound Quality/No Sound - Satellite Radio
Normal Operation - Navigators Without Navigation
Digital signals are received by the satellite radio antenna and sent to the Satellite Digital Audio Receiver System (SDARS) module, which converts the signals and provides audio signals to the Audio Front Control Module (ACM). The satellite radio audio signals route through the audio Rear Control Unit (RCU) module. If the vehicle is equipped with the SYNC(R) system, the audio signals route through the Accessory Protocol Interface Module (APIM) before routing to the audio RCU (Rear Control Unit) module.
Vehicles With Navigation
Digital signals are received by the satellite radio antenna and sent directly to the ACM (Audio Front Control Module), as the satellite radio receiver is built-in to the ACM (Audio Front Control Module).
A short to ground in the satellite radio antenna typically has no effect on the antenna signal. However, an open in the antenna circuit can result in no sound from the satellite radio system. A short to voltage in the antenna circuit can have varying effects on the system.
All Vehicles
Reception can be affected by obstructions to the antenna line-of-sight, such as tall buildings, bridges, driving under an overpass, or being parked in a garage. This is considered normal operation. Make sure the vehicle is in an open area, free of obstacles, before testing the reception.
This pinpoint test is intended to diagnose the following:
- Obstructions to the antenna line of sight
- No channel found in the selected category
- Satellite radio antenna
- Satellite radio antenna cable
- Wiring, terminals or connectors
- SDARS (Satellite Digital Audio Receiver System) module (Navigators without navigation)
- ACM (Audio Front Control Module) (vehicles with navigation)
PINPOINT TEST K : POOR RECEPTION/POOR SOUND QUALITY/NO SOUND - SATELLITE AUDIO
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
K1 CHECK THE RECEPTION AND CATEGORY FILTER SETTING
- Turn the category filter function off. For additional information, refer to the Owner's Literature.
- Drive the vehicle to an open location, free of obstacles.
- Scan for a good channel.
Does the satellite radio system find a good channel with normal reception?
Yes
The system is operating correctly at this time. The concern was a result of no channel being found in the selected category or obstructions to the antenna line of sight.
No
GO to K2.
K2 CHECK THE SATELLITE SIGNAL PID
- Enter the following diagnostic mode on the scan tool: ACM (Audio Front Control Module) DataLogger (Vehicles With Navigation) or SDARS (Satellite Digital Audio Receiver System) Module DataLogger (Navigators Without Navigation).
- For Navigators without navigation, monitor the SDARS (Satellite Digital Audio Receiver System) module PID (SATELLITE).
- For vehicles with navigation, monitor the ACM (Audio Front Control Module) PID (SAT_SIG_STR).
Does the PID indicate "No Signal"?
Yes
GO to K3.
No
For Navigators without navigation, GO to K5.
For vehicles with navigation, GO to Pinpoint Test M. Pinpoint Test M: The Satellite Radio Is Inoperative/Does Not Operate Correctly - Vehicles With Navigation
K3 CHECK THE SATELLITE RADIO ANTENNA CABLE RESISTANCE
- Ignition OFF.
- Disconnect: Satellite Radio Antenna Connection At SDARS (Satellite Digital Audio Receiver System) Module (Navigators without navigation) or ACM (Audio Front Control Module).
- Disconnect: Satellite Radio Antenna Cable In-Line Connection At RH Kick Panel.
- Disconnect: Satellite Radio Antenna Connection At Satellite Radio Antenna.
- Measure the resistance of the rear satellite radio antenna cable core between the satellite radio antenna and the satellite radio antenna in-line connection; and between the rear satellite radio antenna cable core and shield.
- Measure the resistance of the front satellite radio antenna cable core between the SDARS (Satellite Digital Audio Receiver System) module (Navigators without navigation) or the ACM (Audio Front Control Module) (vehicles with navigation) and the satellite radio antenna in-line connection; and between the front satellite radio antenna cable core and shield.
Is the resistance of each satellite radio antenna cable core less than 1 ohm, and the resistance between the core and shield of each satellite radio antenna cable greater than 10,000 ohms?
Yes
GO to K4.
No
INSTALL a new front or rear satellite radio antenna cable, as necessary. REFER to Antenna Cable - Satellite Radio . CLEAR any DTCs present. TEST the system for normal operation.
K4 ISOLATE THE SATELLITE RADIO ANTENNA
- Install a new satellite radio antenna. Refer to Antenna- Satellite Radio .
- Operate the audio system in satellite radio mode.
Is the reception OK?
Yes
The concern was caused by an inoperative satellite radio antenna. The system is operating correctly at this time.
No
For vehicles without navigation, GO to K15.
For vehicles with navigation, GO to K18.
K5 DETERMINE THE VEHICLE CONTENT
- Determine if the vehicle is equipped with the SYNC(R) system.
Is the vehicle equipped with the SYNC(R) system?
Yes
GO to K6.
No
GO to K9.
K6 CHECK THE SYNC(R) SYSTEM AUDIO
- Connect: Multi-Media Interface Tester.
- Using the Multi-Media Interface Tester, test the audio output for the audio input jack, USB (Universal Serial Bus) port, and Bluetooth connection.
Do the SYNC(R) system audio sources operate correctly?
Yes
GO to K7.
No
GO to K11.
K7 CHECK THE AUDIO CIRCUITS TO THE APIM (Accessory Protocol Interface Module) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SDARS (Satellite Digital Audio Receiver System) Module C3290 (Navigators without navigation).
- Disconnect: APIM (Accessory Protocol Interface Module) C3342.
- Ignition ON.
- Measure the voltage between the SDARS (Satellite Digital Audio Receiver System) module (Navigators without navigation), harness side and ground as follows:
Positive Meter Lead Negative Meter Lead C3290-5 VME41 (GN/OG) C3290-11 RME41 (BU/BN) C3290-6 VME42 (VT/BN) C3290-12 RME42 (YE/BU)
Is any voltage present?
Yes
REPAIR the circuit in question. TEST the system for normal operation.
No
GO to K8.
K8 CHECK THE AUDIO CIRCUITS TO THE APIM (Accessory Protocol Interface Module) FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the SDARS (Satellite Digital Audio Receiver System) module (Navigators without navigation), harness side and the APIM (Accessory Protocol Interface Module), harness side; and between the SDARS (Satellite Digital Audio Receiver System) module (Navigators without navigation), harness side and ground as follows:
Positive Meter Lead Negative Meter Lead Circuit C3290-5 C3342-10, then ground VME41 (GN/OG) C3290-11 C3342-11, then ground RME41 (BU/BN) C3290-6 C3342-7, then ground VME42 (VT/BN) C3290-12 C3342-8, then ground RME42 (YE/BU)
Is the resistance less than 5 ohms between the SDARS (Satellite Digital Audio Receiver System) module (Navigators without navigation) and the APIM (Accessory Protocol Interface Module), and greater than 10,000 ohms between the SDARS (Satellite Digital Audio Receiver System) module and ground?
Yes
GO to K9.
No
REPAIR the circuit in question. TEST the system for normal operation.
K9 CHECK THE AUDIO CIRCUITS TO THE AUDIO RCU (Rear Control Unit) MODULE FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SDARS (Satellite Digital Audio Receiver System) Module C3290 (If Connected) (Navigators without navigation).
- Disconnect: Audio RCU (Rear Control Unit) Module C3077.
- Ignition ON.
- Measure the voltage between the audio RCU (Rear Control Unit) module, harness side and ground as follows:
Positive Meter Lead Negative Meter Lead C3077-5 VME41 (GN/OG) C3077-6 RME41 (BU/BN) C3077-21 VME42 (VT/BN) C3077-22 RME42 (YE/BU)
Is any voltage present?
Yes
REPAIR the circuit in question. TEST the system for normal operation.
No
GO to K10.
K10 CHECK THE AUDIO CIRCUITS TO THE AUDIO RCU (Rear Control Unit) MODULE FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- For vehicles without the SYNC(R) system, measure the resistance between the audio RCU (Rear Control Unit) module, harness side and the SDARS (Satellite Digital Audio Receiver System) module (Navigators without navigation), harness side; and between the audio RCU (Rear Control Unit) module, harness side and ground as follows:
Positive Meter Lead Negative Meter Lead Circuit C3077-5 C3290-5, then ground VME41 (GN/OG) or VME52 (BU) C3077-6 C3290-11, then ground RME41 (BU/BN) or RME52 (GY/OG) C3077-21 C3290-6, then ground VME42 (VT/BN) or VME53 (VT/GN) C3077-22 C3290-12, then ground RME42 (YE/BU) or RME53 (BN/WH)
- For vehicles with the SYNC(R) system, measure the resistance between the audio RCU (Rear Control Unit) module, harness side and the APIM (Accessory Protocol Interface Module), harness side; and between the audio RCU (Rear Control Unit) module, harness side and ground as follows:
Positive Meter Lead Negative Meter Lead Circuit C3077-5 C3342-40, then ground VME52 (BU) C3077-6 C3342-41, then ground RME52 (GY/OG) C3077-21 C3342-42, then ground VME53 (VT/GN) C3077-22 C3342-43, then ground RME53 (BN/WH)
Are the resistances less than 5 ohms between components, and greater than 10,000 ohms between each component and ground?
Yes
GO to K11.
No
REPAIR the circuit in question. TEST the system for normal operation.
K11 CHECK THE AUDIO CIRCUITS TO THE ACM (Audio Front Control Module) FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: ACM (Audio Front Control Module) C240C.
- Disconnect: Audio RCU (Rear Control Unit) Module C3077.
- Ignition ON.
- Measure the voltage between the ACM (Audio Front Control Module), harness side and ground as follows:
Positive Meter Lead Negative Meter Lead Circuit C240C-1 Ground VME17 (GN) C240C-2 Ground RME17 (GY) C240C-9 Ground VME18 (VT) C240C-10 Ground RME18 (YE)
Is any voltage present?
Yes
REPAIR the circuit in question. TEST the system for normal operation.
No
GO to K12.
K12 CHECK THE AUDIO CIRCUITS TO THE ACM (Audio Front Control Module) FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the ACM (Audio Front Control Module), harness side and the audio RCU (Rear Control Unit) module, harness side; and between the ACM (Audio Front Control Module), harness side and ground as follows:
Positive Meter Lead Negative Meter Lead Circuit C240C-1 C3077-10, then ground VME17 (GN) C240C-2 C3077-9, then ground RME17 (GY) C240C-9 C3077-26, then ground VME18 (VT) C240C-10 C3077-25, then ground RME18 (YE)
Is the resistance less than 5 ohms between the ACM (Audio Front Control Module) and the audio RCU (Rear Control Unit) module, and greater than 10,000 ohms between the ACM (Audio Front Control Module) and ground?
Yes
If the vehicle is equipped with the SYNC(R) system, GO to K13.
Otherwise, GO to K14.
No
REPAIR the circuit in question. TEST the system for normal operation.
K13 ISOLATE THE APIM (Accessory Protocol Interface Module)
- Ignition OFF.
- Connect: SDARS (Satellite Digital Audio Receiver System) Module C3290 (Navigators without navigation).
- Connect: ACM (Audio Front Control Module) C240C.
- Connect: Audio RCU (Rear Control Unit) Module C3077 (If Equipped).
- Connect fused jumper wires between the APIM (Accessory Protocol Interface Module) pins as follows:
APIM (Accessory Protocol Interface Module) Connector-Pin/Circuit APIM (Accessory Protocol Interface Module) Connector-Pin/Circuit C3342-7 VME42 (VT/BN) C3342-42 VME53 (VT/GN) C3342-8 RME42 (YE/BU) C3342-43 RME53 (BN/WH) C3342-10 VME41 (GN/OG) C3342-40 VME52 (BU) C3342-11 RME41 (BU/BN) C3342-41 RME52 (GY/OG)
- Operate the audio system in satellite radio mode.
Does the satellite radio audio operate correctly?
Yes
REMOVE the jumper wires. GO to K16.
No
REMOVE the jumper wires. GO to K14.
K14 ISOLATE THE AUDIO RCU (Rear Control Unit) MODULE
- Ignition OFF.
- Connect: SDARS (Satellite Digital Audio Receiver System) Module C3290 (If Disconnected) (Navigators without navigation).
- Connect: ACM (Audio Front Control Module) C240C (If Disconnected).
- Connect: APIM (Accessory Protocol Interface Module) C3342 (If Disconnected).
- Disconnect: Audio RCU (Rear Control Unit) Module C3077.
- Connect fused jumper wires between the audio RCU (Rear Control Unit) module pins as follows:
Audio RCU (Rear Control Unit) Module Connector-Pin/Circuit Audio RCU (Rear Control Unit) Module or RETM (Rear Entertainment Module) Connector-Pin/Circuit C3077-5 VME41 (GN/OG) C3077-10 VME17 (GN) C3077-6 RME41 (BU/BN) C3077-9 RME17 (GY) C3077-21 VME42 (VT/BN) C3077-26 VME18 (VT) C3077-22 RME42 (YE/BU) C3077-25 RME18 (YE)
- Operate the audio system in satellite radio mode.
Does the satellite radio audio operate correctly?
Yes
REMOVE the jumper wires.
GO to K17.
No
REMOVE the jumper wires. GO to K15.
K15 CHECK FOR CORRECT SDARS (Satellite Digital Audio Receiver System) MODULE OPERATION (Navigators without navigation)
- Connect: All Disconnected Connectors.
- Disconnect the SDARS (Satellite Digital Audio Receiver System) module connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the SDARS (Satellite Digital Audio Receiver System) module connector and make sure it seats correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new SDARS (Satellite Digital Audio Receiver System) module. REFER to Satellite Digital Audio Receiver System (SDARS) Module . 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.
K16 CHECK FOR CORRECT APIM (Accessory Protocol Interface Module) OPERATION
- Connect: All Disconnected Connectors.
- 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 verify 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.
K17 CHECK FOR CORRECT AUDIO RCU (Rear Control Unit) MODULE OPERATION
- Connect: All Disconnected Connectors.
- Disconnect the audio RCU (Rear Control Unit) module connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the audio RCU (Rear Control Unit) module connector and make sure it seats correctly.
Is the concern still present?
Yes
INSTALL a new audio RCU (Rear Control Unit) module. REFER to Audio Rear Control Unit (RCU) Module . 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.
K18 CHECK FOR CORRECT ACM (Audio Front Control Module) OPERATION
- Connect: All Disconnected Connectors.
- 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.