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Radio Diagnostics

new 3/24/2004

Flow of Diagnosis

NOTE: Many customers do not understand the limitations of FM reception. Refer the customer to the Owner Guide for information about the limitations of FM radio performance.

Internal diagnostic examination of the integrated control panel, rear chassis unit and audio compact disc player should be left to the authorized radio service center. However, the automotive technician should be able to analyze and isolate radio reception conditions to the proper area or component causing the condition. All radio conditions can be isolated to one of six general areas:

antenna system
integrated control unit
radio speaker system
radio noise suppression equipment
rear chassis unit
audio communications protocol network
Retrieving Diagnostic Trouble Codes (DTCs)

Using Audio System On-Board Diagnostics
The audio system has on-board diagnostic capabilities and is equipped to check for every component available in the system even if this specific vehicle is not equipped with all components. A Diagnostic Trouble Code (DTC) will be set for the missing components. These DTCs can be ignored if the vehicle is not equipped with these components.

The battery must be fully charged for proper audio system operation. The ignition switch must be in the RUN or ACC position. Turn the system on, tune in a strong AM station and verify good reception. After an AM station is checked, tune in a strong FM station. The system is now ready to enter the diagnostic mode.

Diagnostic Mode:

NOTE: Battery must be fully charged for proper audio system operation and self-test.

Enter Diagnostics mode by pressing SEEK DOWN button first and then pre-set button 3. Hold both buttons for five seconds . This will suspend all normal radio functions, retain the previously selected frequency and display DIAG.

SYSTEM CONFIGURATION SELF-TEST: Press pre-set button 1. This will check for connection of all possible devices and log the diagnostic trouble codes for any device that does not respond. The display will flash SELF while gathering the diagnostic trouble codes, then stop flashing when complete. To exit System Configuration Self-test, press pre-set button 1 again. To retrieve diagnostic trouble codes, press the TUNE UP button. This will display the diagnostic trouble codes if any exist. Continued pressing of the TUNE UP button will display the next diagnostic trouble code. Record codes and refer to the Configuration Self-Test Codes table. To exit the Retrieval Mode, press pre-set button 1.


0 -  No diagnostic trouble codes logged

1 -  No response from rear chassis unit

2 -  No response from tape deck

3 -  No response from bezel microprocessor

4 -  No response from compact disc player

5 -  No response from steering wheel controls

6 -  No response from rear seat control

7 -  No response from remote climate control

8 -  No response from navigation module

9 -  Read Only Memory verification failed

Remember, system configuration will test for all possible equipment connections. Inspect the vehicle to determine actual equipment installed.

NOTE: To perform diagnostics, press the appropriate buttons as instructed.

Integrated control panel display test: To enter the integrated control panel display test, press pre-set button 5. This check will light all segments in the integrated control panel. The system will automatically exit this test after five seconds .

Integrated control panel and rear chassis unit identification: To enter this test, press pre-set button 3. This test identifies the software level of the integrated control panel and rear chassis unit. The integrated control panel is tested first, followed by the rear chassis unit. The completed test will exit automatically. For code identification, refer to the table. The display will have two sequences of five codes each. The first sequence is for the integrated control panel, the second sequence is for the rear chassis unit.

Rear chassis unit self test: To enter this test, press pre-set button 4. This test will check the rear chassis unit Read Only Memory (ROM) and Electrically Erasable Read Only Memory (EEPROM) memory chips. The completed test will exit automatically. For code identification, refer to the table.
Compact disc player: The compact disc player will automatically display diagnostic trouble codes for unacceptable operating conditions that hinder normal performance. The table shows code identification. The system will automatically exit the test upon completion of the test.

Operating Conditions

CD-E1 - Mechanism Error

CD-E2  - Focus Error

CD-E3 - Disc Unreadable

Too Hot - Thermal Shutdown

No CD -  Empty Slot or Magazine Not Inserted

No DJ  -  No Compact Disc Player Detected

Speaker Walk-Around Test
Included in the audio system on-board diagnostic capabilities is the SPEAKER WALK-AROUND test. This test will automatically adjust the volume to mid-level and display SPKR on the front control unit. The fade and balance will then select each speaker as follows: right front, left front, right rear, left rear.

To enter this test while in the diagnostic mode, press pre-set button 2.

To enter this test when not in diagnostic mode, press and hold memory presets 3 and 6 simultaneously and release when SPKR is displayed. In this mode, two additional self test messages could be displayed:

NO DJ will be displayed if no CD player is detected and the installed radio chassis is expecting a CD player.
BAD BUILD will be displayed if there is a mis-match between the rear chassis unit (digital or analog) and the integrated control panel.
Pressing any button during speaker walk-around test will abort this test.

The system will then exit the test automatically upon completion of the test.

Verify the customer's concern by operating the electronic audio system to duplicate the condition.
Inspect to determine if one of the mechanical or electrical concerns apply:


Integrated control panel with or without tape player physically damaged, misaligned, any controls inoperative.
Digital audio compact disc player physically damaged, misaligned, any controls inoperative.
Radio antenna lead in cable, electric antenna or body physically damaged or misaligned connections.
Radio speaker mounting/speaker cones physically damaged, misaligned.
Radio ignition interference capacitor or radio frequency interference suppression bond misaligned, unclean and no metal-to-metal contact.
Mobile telephone transceiver; mobile telephone handset, mobile telephone microphone, mobile telephone transceiver holder cradle physically damaged, misaligned.

Open fuses: fuse junction panel fuses 8 (5 A) , 12 (5 A) , 20 (5 A) , 22 (5 A) , 24 (5 A) or power distribution box fuse 17 (20 A) .
Open connectors.
Corroded connectors.
If inspection reveals an obvious concern that is readily serviced, correct the concern before continuing with Inspection and Verification.
If a concern remains after the inspection, determine the symptom(s) and go to Symptom Chart. See: Procedures\Symptom Chart(s)



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