Pinpoint Test I: Poor Reception/Poor Sound Quality/No Sound - Satellite Radio Without Navigation
Information and Entertainment System
Pinpoint Tests
Pinpoint Test I: Poor Reception/Poor Sound Quality/No Sound - Satellite Radio Without Navigation
Normal Operation
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 Control Module (ACM). If the vehicle is equipped with the SYNC system, the audio signals route through the Accessory Protocol Interface Module (APIM) before routing to the ACM.
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.
- DTC B1031 (SDARS Satellite Antenna Open) - sets when an open or high resistance is detected in the satellite antenna circuit. This DTC can be either continuous or on-demand.
- DTC B1032 (SDARS Satellite Antenna Short) - sets when a short to ground or short to voltage is detected in the satellite antenna circuit. This DTC can be either continuous or on-demand.
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 module
- APIM (if equipped)
- ACM
PINPOINT TEST I: POOR RECEPTION/POOR SOUND QUALITY/NO SOUND - SATELLITE RADIO WITHOUT NAVIGATION
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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I1 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 I2.
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I2 CHECK THE SATELLITE SIGNAL PID (SATELTE)
- Enter the following diagnostic mode on the scan tool: SDARS Module DataLogger.
- Monitor the SDARS module PID (SATELTE).
- Does the PID indicate "No Signal"?
Yes
GO to I3.
No
GO to I5.
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I3 CHECK THE SATELLITE RADIO ANTENNA CABLE RESISTANCE
- Ignition OFF.
- Disconnect: Satellite Radio Antenna Connection At SDARS Module.
- Disconnect: Satellite Radio Antenna Connection At Satellite Radio Antenna.
- Measure the resistance of the satellite radio antenna cable core between the satellite radio antenna and the SDARS module; and between the rear satellite radio antenna cable core and shield.
- Is the resistance of the core less than 1 ohm, and the resistance between the core and shield greater than 10,000 ohms?
Yes
GO to I4.
No
INSTALL a new satellite radio antenna cable. REFER to Antenna Cable - Satellite Radio, Without Navigation Antenna Cable - Satellite Radio, Without Navigation. CLEAR any DTCs present. TEST the system for normal operation.
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I4 ISOLATE THE SATELLITE RADIO ANTENNA
- Install a known good satellite radio antenna. Refer to Antenna - Satellite Radio 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
GO to I12.
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I5 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 I6.
No
GO to I10.
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I6 CHECK THE SYNC SYSTEM AUDIO
- Connect: Multi-Media Interface Tester.
- Using the Multi-Media Interface Tester, test the audio output for the audio input jack, USB port, and Bluetooth connection.
- Do the SYNC system audio sources operate correctly?
Yes
GO to I7.
No
Go To Pinpoint Test X. Pinpoint Test X: Poor Quality/Distorted/No Sound - SYNC System
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I7 CHECK THE AUDIO CIRCUITS TO THE APIM FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: SDARS Module C4344.
- Disconnect: APIM C3342.
- Ignition ON.
- Measure the voltage between the SDARS module, harness side and ground as follows:
- Is any voltage present?
Yes
REPAIR the circuit in question. TEST the system for normal operation.
No
GO to I8.
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I8 CHECK THE AUDIO CIRCUITS TO THE APIM FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the SDARS module, harness side and the APIM, harness side; and between the SDARS module, harness side and ground as follows:
- Is the resistance less than 5 ohms between the SDARS module and the APIM, and greater than 10,000 ohms between the SDARS module and ground?
Yes
GO to I9.
No
REPAIR the circuit in question. TEST the system for normal operation.
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I9 ISOLATE THE APIM
- Ignition OFF.
- Connect: SDARS Module C4344.
- Connect: ACM C240b.
- Connect fused jumper wires between the APIM pins as follows:
- Operate the audio system in satellite radio mode.
- Does the satellite radio audio operate correctly?
Yes
REMOVE the jumper wires. GO to I13.
No
REMOVE the jumper wires. GO to I12.
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I10 CHECK THE AUDIO CIRCUITS TO THE ACM FOR A SHORT TO VOLTAGE
- Ignition OFF.
- Disconnect: ACM C240b.
- Disconnect: SDARS Module C4344.
- Ignition ON.
- Measure the voltage between the ACM, harness side and ground as follows:
- Is any voltage present?
Yes
REPAIR the circuit in question. TEST the system for normal operation.
No
GO to I11.
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I11 CHECK THE AUDIO CIRCUITS TO THE ACM FOR AN OPEN OR SHORT TO GROUND
- Ignition OFF.
- Measure the resistance between the ACM, harness side and the SDARS module, harness side; and between the ACM, harness side and ground as follows:
- Is the resistance less than 5 ohms between the ACM and the SDARS module, and greater than 10,000 ohms between the ACM and ground?
Yes
GO to I12.
No
REPAIR the circuit in question. TEST the system for normal operation.
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I12 CHECK FOR CORRECT SDARS MODULE OPERATION
- Connect: All Disconnected Connectors.
- Disconnect the SDARS module connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the SDARS 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 module. REFER to Satellite Digital Audio Receiver System (SDARS) Module Service and Repair.
TEST the system for normal operation. If the concern is still present, GO to I14.
No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
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I13 CHECK FOR CORRECT APIM OPERATION
- Connect: All Disconnected Connectors.
- Disconnect the APIM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the APIM connector and make sure it seats correctly.
- Wait 2 minutes for the APIM to re-initialize.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new APIM. REFER to Accessory Protocol Interface Module (APIM) 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.
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I14 CHECK FOR CORRECT ACM OPERATION
- Ignition OFF.
- Disconnect all the ACM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the ACM 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. REFER to Audio Control Module (ACM) 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.
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