Flow of Diagnosis

NOTE: Many customers do not understand the limitations of FM reception.

Internal diagnostic examination of the front control unit, rear chassis unit, sub-woofer amplifier, digital audio compact disc player, steering wheel control module and radio chassis 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
^ Radio chassis
^ Radio speaker system
^ Radio noise suppression equipment
^ Premium sound system
^ Audio communications protocol network

Retrieving Diagnostic Trouble Codes (DTCs) Using Audio System On-Board Diagnostics
The luxury audio system has on-board diagnostic capabilities and is equipped to check for every component available in the luxury system even if this specific vehicle is not equipped with all components. A 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 ACC or RUN 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.

1. System Configuration Self-Test:
Press pre-set button 1. This will check for connection of all possible devices and log the Diagnostic Trouble Codes (DTCs) for any device that does not respond. The display will flash SELF while gathering the DTCs, then stop flashing when complete. To exit System Configuration Self-test, press pre-set button 1 again. To retrieve DTCs, press the TUNE UP button. This will display the DTCs if any exist. Continued pressing of the TUNE UP button will display the next DTC. Record codes and compare with the table. To exit the Retrieval Mode, press pre-set button 1.

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.


CONFIGURATION SELF-TEST CODES

Code Description
0 No codes logged
1 No response from rear chassis unit
2 No response from tape deck
3 No response from bezel micro
4 No response from Digital Audio compact Disc Player
5 No response from Steering wheel Control Module
6 No response from Rear Seat Control
7 No response from Remote Climate Control Module
8 No response from navigation unit
9 ROM checksum verification failed

2. Front Control Unit Display Test:

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













3. Front Control Unit and Rear Chassis Unit Identification:

To enter this test, press pre-set button 3. This test identifies the software level of the front control unit and rear chassis unit. The front control unit 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 front control unit, the second sequence is for the rear chassis unit.








4. 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 programmable Rear Only Memory (EEPROM) memory chips. The completed test will exit automatically. For code identification, refer to the table.

5. Compact Disc Changer:

The digital audio compact disc player will automatically display error codes for unacceptable operating conditions that hinder normal performance. For code identification, refer to the table.

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

COMPACT DISPLAYER DIAGNOSTIC TROUBLE CODES

Display 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

Speaker Walk-Around Test
Included in the luxury 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: RH front, LH front, RH rear, LH rear and subwoofer speaker (if equipped).

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 front control unit.

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

VISUAL INSPECTION CHART

Mechanical
^ Radio chassis with or without tape player physically damaged, misaligned. any controls inoperative.
^ Digital audio compact disc player physically damaged, misaligned, any controls inoperative.
^ Antenna, antenna cable or on-glass FM antenna and on-glass AM antenna (defroster grid on rear window) physically damaged, misaligned connections.
^ Radio speakers mounting/speaker cones physically damaged, misaligned.
^ Radio ignition interference capacitor, radio frequency interference suppression bond and radio receiver hood bonding strap misaligned, damaged or poor metal-to-metal contact.
^ Mobile telephone handset. mobile telephone microphone or mobile telephone transceiver holder cradle physically damaged, misaligned

Electrical
^ Open fuses.
^ Open connectors.
^ Corroded connectors.
^ Ignition switch.

3. If the inspection reveals obvious concern(s) that can be readily identified, service as required.
4. If the concern(s) remains after the inspection, determine the symptom(s) and go to the Symptom Chart. Diagnosis by Symptom