Description
When the audio system is turned on, a voltage signal is supplied from the AV control unit to the BOSE speaker amp. When this signal is received, the BOSE speaker amp. will turn on.
Diagnosis Procedure
1.CHECK AMP ON SIGNAL (BOSE SPEAKER AMP)


2.CHECK AMP ON SIGNAL (AV CONTROL UNIT)

Check voltage between AV control unit harness connector M160 terminal 1 and ground

Microphone signal circuit
Front door speakerStartup display
When the vehicle in placed in the ON or ACC
position the screens that display in the vehicle
information display include:
Home
Audio
Navigation
Drive Computer
Fuel economy
Driving Aids (if so equipped)
Tire Pressures
Chassis Control (if so equipped)
SPORT
Warning Review
Set ...
P1574 ASCD vehicle speed sensor
Description
The ECM receives two vehicle speed signals via the CAN communication line.
One is sent from combination
meter, and the other is from TCM (Transmission control module). The ECM uses
these signals for ASCD control.
Refer to EC-68, "System Diagram" for ASCD functions.
D ...
P0442 evap control system
DTC Logic
DTC DETECTION LOGIC
This diagnosis detects leakage in the EVAP purge line using engine intake
manifold vacuum.
If pressure does not increase, the ECM will check for leakage in the line
between the fuel tank and EVAP canister
purge volume control solenoid valve, under the followi ...