Audio Unit Self-Diagnostic Mode (Premium CD6 Only)

WARNING: This page is about a different car, the 2006 Mercury Mariner and 2006 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.

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

To enter the following tests, press the desired preset button while in the speaker walk-around test or while in the audio unit self-diagnostic mode.
To exit the audio unit self-diagnostic mode, turn the ignition switch or the audio unit off.
If the concern remains and the fault is not detected, GO to SYMPTOM CHART to continue diagnostics.

The self-diagnostic mode has five manual tests available. To enter each test, simultaneously press and hold the appropriate buttons as listed below:

PREMIUM CD6 AUDIO UNIT DIAGNOSTIC TESTS

Test	Button	Button	Function
DISPLAY TEST	POWER	SEEK UP	This test lights all the display segments. To exit, turn the audio unit or the key to the OFF position.
S-METER	POWER	Preset 2	The VOLUME bar segment lights up to show the signal strength of the selected station. The stronger the signal, the more bars light up on the audio unit display. The tuner knob and preset buttons function during this test so that the S-METER readings can be taken from other AM and FM stations.
BEZEL SW CHECK	POWER	CLOCK	While in this diagnostic mode, pressing any of the audio unit buttons will generate a 3k Hz tone for 100 ms, without activating the function of that button. On the eject button you will not hear the beep tone, however any CD present will eject.
ANT-CONT CHECK	POWER	AM	If there is a software problem within the audio unit, the antenna can be shut off. This is done automatically by the audio unit and cannot be done by the user. In this diagnostic mode, a correctly functioning audio unit should display ANT-ON.
AMP-CONT CHECK	POWER	SCAN	If there is a software problem, the audio unit internal amplifier can be shut off. This is done automatically by the audio unit and cannot be done by the user. In this diagnostic mode, a correctly functioning audio unit should display AMP-ON.

To exit the self-diagnostic mode, turn the ignition switch off or the audio unit off.
If the concern remains and the fault is not detected, GO to SYMPTOM CHART to continue diagnostics.

AUDIO UNIT DIAGNOSTIC TROUBLE CODE (DTC) INDEX

DTC	Description	Source	Action
B1342	ECU is Defective	Audio Unit	CLEAR and DOCUMENT the DTCs. CARRY OUT the self-test. If DTC B1342 is retrieved again, REMOVE the audio unit. REFER to AUDIO UNIT in this article. SEND it to an authorized audio system repair facility. TEST the system for normal operation after the repair.
B2401	Audio Tape Deck Mechanism Fault	Audio Unit	VERIFY that no cassette is inserted in the audio unit. CLEAR and DOCUMENT the DTCs. CARRY OUT the self-test. If DTC B2401 is retrieved again, REMOVE the audio unit. REFER to AUDIO UNIT in this article. SEND it to an authorized audio system repair facility. TEST the system for normal operation after the repair.
B2405	Audio Single-Disc CD Player Thermal Shutdown Fault	Audio Unit	CLEAR and DOCUMENT the DTCs. CARRY OUT the self-test. If DTC B2405 is retrieved again, REMOVE the audio unit. REFER to AUDIO UNIT in this article. SEND it to an authorized audio system repair facility. TEST the system for normal operation after the repair.
B2406	Audio Single-Disc CD Player Internal Fault	Audio Unit	CLEAR and DOCUMENT the DTCs. CARRY OUT the self-test. If DTC B2406 is retrieved again, REMOVE the audio unit. REFER to AUDIO UNIT in this article. SEND it to an authorized audio system repair facility. TEST the system for normal operation after the repair.