Ford Crown Victoria & Mercury Grand Marquis Stereo Radio Self Test:

The upper level P100i radio used in the crown victoria lx's and grand marquis ls's has a built in diagnostic mode to aid in service. Among other things, the procedure listed below will turn each speaker on individually and display error codes & software revision information. Note that the radio is referred to as the "audio control module" and abbreviated A.C.M. in this document.

Speaker Walk-Around Test

NOTE: To enter the speaker walk-around test or ACM self-diagnostic mode, the ACM must be turned on and in radio tuner mode (AM/FM).

1. To enter the speaker walk-around test, simultaneously press the ACM Preset Buttons 3 and 6 (1 and 3 for ULC radio only). 
2. The speaker walk-around test stops at each speaker and applies sound to each speaker for about 1-2 seconds. Each speaker is tested and displayed on the ACM in the following sequence: RF, LF, LR, RR. 
3. The speaker walk-around test automatically continues and tests Subwoofer 1, Subwoofer II and for speaker short (P100i only). If a short is present, SPKR SHORT will be displayed.
   

ACM Self-Diagnostic Mode (P100i Only)

NOTE: To enter the speaker walk-around test or ACM self-diagnostic mode, the ACM must be turned on and in radio tuner mode (AM/FM). The ACM self-diagnostic mode can only be entered while in the speaker walk-around test.

1. The ACM self-diagnostic mode (P100i only) has five tests available:
• Preset button 1 = Audio internal/external SELF TEST. If SELF FAIL is displayed, press TUNE > to scroll view the diagnostic trouble codes (DTCs) stored. Refer to ACM Diagnostic Trouble Code (DTC) Index. If system is OK, SELF PASS is displayed.
• Preset button 2 = View/clear continuous DTCs. NO DTCS is displayed if no DTCs are retrieved. If DTCS FOUND is displayed, press TUNE > button to view the DTCs retrieved. Refer to ACM Diagnostic Trouble Code (DTC) Index. To clear all DTCs, press the EJECT button. DTCS CLEAR will be displayed. 
• Preset button 3 = SIGNAL TEST. This test measures the average strength at the current tuner setting. 
• Preset button 4 = Software configuration level. This test queries each radio system controller for their software configuration level. SOFT LEVELS will be displayed upon completion of the query. Press TUNE > to scroll view the software configuration version level

• 	Configurations and Software Levels
  Controller	Description	Radio Display Example
  Main	Main micro software version	MAIN ##.##.##
  CDSP	CDSP micro software version	CDSP ##.##.##
  ADSP	ADSP micro software version	ADSP ##.##.##
  Auxiliary	Auxiliary software version	AUX ##.##.##
  CD/DJ	CD/DJ software version	DJ ##.##.##
  CD changer	CDR software version	CD ##.##.##
  Tape deck	Tape deck software version	TAP ##.##.##
  RSC	Rear seat controller software version	RCP ##.##.##

• Preset button 5 = DISPLAY TEST. This test will light all the ACM display segments for five seconds and then turn all segments off. When the test is complete, DISPLAY TEST is displayed on the bezel. 
2. To enter these tests, press the preset button desired while in the speaker walk-around test. This will abort the speaker walk-around test and start the selected test. 
3. To exit the ACM self-diagnostic mode, turn the ignition switch or ACM off. 
4. If the concern remains and the fault is not detected, proceed to the Symptom Chart to continue diagnostics. 

ACM Diagnostic Trouble Code (DTC) Index

DTC	Description	Notes
B1342	ECU is Defective	CLEAR and DOCUMENT the DTCs. CARRY OUT the ACM on-demand self-test. REMOVE the ACM and SEND it to an authorized Ford audio system repair facility if DTC B1342 is retrieved again. TEST the system for normal operation.
B2401	Audio Tape Deck Mechanism Fault	VERIFY that no tape is inserted in the ACM. CLEAR and DOCUMENT the DTCs. CARRY OUT the ACM on-demand self-test. If DTC B2401 is retrieved again, REMOVE the ACM and SEND it to an authorized Ford audio system repair facility. TEST the system for normal operation.
B2402	Audio CD/DJ Thermal Shutdown Fault
B2403	Audio CD/DJ Internal Fault
B2404	Audio Steering Wheel Switch circuit Fault	Not applicable to vehicles without steering wheel radio controls
B2405	Audio Single-Disc CD Player Thermal Shutdown Fault
B2406	Audio Single-Disc CD Player Internal Fault	Not applicable. Vehicle is not equipped with single-disc CD. CLEAR and DOCUMENT DTCs. CARRY OUT ACM self-test.
U1041	Invalid or Missing Data For Vehicle Speed	See note below about speed sensitive volume
U2003	Audio Compact Disc/Disc Jockey is Not Responding	Not applicable unless the vehicle is equipped with a ford compact disc changer
U2005	Audio Rear Integrated Control Panel Unit is Not Responding	Not applicable. Vehicle is not equipped with rear integrated control panel (RICP). CLEAR and DOCUMENT DTCs. CARRY OUT ACM self-test
U2008	Audio Phone is Not Responding	Not applicable. Vehicle is not equipped with audio phone. CLEAR and DOCUMENT DTCs. CARRY OUT ACM self-test.
U2014	Audio Subwoofer Unit is Not Responding	Not applicable to crown vics as they are not equipped with a subwoofer unit like their lincoln town car counterparts.

Note: Lincoln town cars have speed sensitive volume feature where the volume of the radio rises as vehicle speed increases to compensate for road noise variations. To adjust the amount of compensation, hold down the power knob for a few seconds while the radio is on and "speed vol" appear. Then use the select button to adjust desired degree of speed volume compensation. In these vehicles, speed data is received via the scp databus from the anti-lock brake controller. The towncar radio obtains vehicle speed info via the is installed into your abs equipped crown vic, it may be possible to enable the speed sensitive feature by adding pins to the appropriate radio connector and connecting them to the vehicles databus.