Audio System - Delayed Sound/No Audio Display
Group 84
Phone, Navigation Systems
84 02 01
Woodcliff Lake, NJ
Service Engineering
February 2001
SUBJECT:
Delayed Audio Sound/No Audio Display on Vehicles with Nav System
MODEL:
E38, E39, E46, E53 with Nav
219
SITUATION
Customer may complain of the following condition when the vehicle is started:
-- The audio sound may be delayed (approximately 10 to 15 seconds), and the audio source information (radio station frequency) is not
automatically displayed on the on-board monitor screen. Instead, the main menu remains on the screen.
-- In some cases, it is possible to have the audio screen displayed (with a 10 second delay), but instead of radio station frequency information, the
orange horizontal line appears in the upper part of the screen.
This may occur if the radio is left ON when the ignition is turned OFF.
CAUSE
I-Bus communication (between the radio, DSP amplifier, BMTM board monitor controls, and NAV computer) is momentarily disrupted by the
excessive voltage drop when the vehicle is started. The situation is created by an undercharged battery condition (battery voltage below 12.15V).
CORRECTION
Check battery condition (perform load test). Fully recharge battery. Do not replace any audio or navigation components.
