Symptom Chart

Symptom Chart - Audio System

Condition	Possible Sources	Action
No communication with the audio unit	Fuse Circuitry Audio unit	REFER to MODULE COMMUNICATIONS NETWORK .
No communication with the satellite radio receiver	Fuse Circuitry Audio unit	REFER to MODULE COMMUNICATIONS NETWORK .
The audio unit is inoperative/does not operate correctly - satellite audio	Circuitry Satellite radio receiver Audio unit	Go to Pinpoint Test F .
The audio unit backlight does not operate correctly	Module configuration Circuitry Audio unit	VERIFY the audio unit is configured for network-based illumination. If the audio unit is configured correctly, REFER to INSTRUMENT CLUSTER AND PANEL ILLUMINATION , to diagnose a single illumination source inoperative. If the audio unit is not configured correctly, CONFIGURE the audio unit. REFER to MODULE CONFIGURATION , to carry out programmable module installation (PMI). TEST the system for normal operation.
Poor reception - AM/FM	Antenna Antenna cable(s) Charging system Ignition system Noise suppression equipment Audio unit	Go to Pinpoint Test A .
Poor reception - satellite audio	Obstructions to the line of sight	DRIVE the vehicle to an open area and TEST the reception. If the reception is OK, INFORM the customer of the normal condition. If the reception is not OK, go to Pinpoint Test G .
	Satellite antenna Satellite antenna cable Satellite radio receiver	Go to Pinpoint Test G .
Continuous seek/scan in AM/FM	RDS function setting	VERIFY the RDS is set to ALL SCAN. If a good channel is found, the cause of the concern was that no RDS channel in the selected category was found. The system is OK. If a good channel is not found, go to Pinpoint Test A .
	Antenna cable(s) Noise suppression equipment Antenna Audio unit	Go to Pinpoint Test A .
Poor quality/distorted/no sound from one or more speakers (not all speakers) - except subwoofers	Circuitry Speaker Audio unit	Go to Pinpoint Test B .
Poor quality/distorted/no sound from all speakers	Circuitry Audio unit	With the key in any position except START, MEASURE the voltage between the audio unit C290d-15, circuit 1000 (RD/BK), harness side and ground. If any voltage is present, REPAIR the circuit. TEST the system for normal operation. If no voltage is present, REMOVE the audio unit and SEND it to an authorized audio system repair facility. REFER to Audio Unit . TEST the system for normal operation after the repair.
The subwoofer is inoperative/does not operate correctly - front subwoofers	Fuse Circuitry Subwoofer amplifier Front subwoofer Audio unit	Go to Pinpoint Test C .
The subwoofer is inoperative/does not operate correctly - rear subwoofers	Fuse Circuitry Subwoofer amplifier Rear subwoofer Audio unit	Go to Pinpoint Test D .
Loud popping sound when cycling the ignition switch	Fuse Circuitry Subwoofer amplifier Audio unit	Go to Pinpoint Test E .
The speed sensitive volume does not operate correctly.	Instrument cluster Audio unit	Go to Pinpoint Test M .
The audio unit is inoperative/does not operate correctly - audio input jack	Circuitry Audio input jack Audio unit	Go to Pinpoint Test N .

Symptom Chart - Navigation

Condition	Possible Sources	Action
No global positioning system (GPS) antenna signal	GPS antenna Audio unit	Go to Pinpoint Test H .
The position cursor is inaccurate	Audio unit	Go to Pinpoint Test L .
The audible switch feedback is inoperative	Audio unit	Go to Pinpoint Test I .
The voice guidance is inoperative/does not operate correctly	Audio unit	Go to Pinpoint Test J .
The display screen is inoperative	Audio unit	REMOVE the audio unit and SEND it to an authorized audio system repair facility. REFER to Audio Unit . TEST the system for normal operation after the repair.
Unable to insert or eject map disc	Audio unit	REMOVE the audio unit and SEND it to an authorized audio system repair facility. REFER to Audio Unit . TEST the system for normal operation after the repair.