Volvo Workshop Manuals
XC90 AWD V8-4.4L VIN 85 B8444S (2005)
Relays and Modules > Relays and Modules - Accessories and Optional Equipment > Communications Control Module > Component Information > Testing and Inspection > Reading and Clearing Diagnostic Trouble Codes > Page 312
Communications Control Module: Component Tests and General Diagnostics
Checking the Voltage/Ground Terminal, Audio Module (AUD)
Checking the voltage/ground terminal
Checking the power supply and ground terminals
Power supply audio module (AUD)
The power supply to the audio module (AUD) is via two power inputs on the control module.
Power input 1 (terminal #45 (#A1)) is supplied with power via a fuse from the battery. The audio module (AUD) will not be activated if there is an
Power input 2 (terminal #6 (#B6)) is supplied with power via a relay on the central electronic module (CEM). The relay is powered via a fuse from
Checking the power supply
Check the power supply cable from the battery to the relay on the central electronic module (CEM) and from the relay for the audio module (AUD)
Ground terminal audio module (AUD)
The audio module (AUD) has a ground input. The ground input from the control module is connected via a ground lead to the ground terminal in the car
Ground input 1 (terminal #46 (#A2) is power ground and is connected to the ground terminal in the car body.
Checking ground terminal
Check the ground lead between audio module (AUD) terminal #46 (#A2) and the ground terminal. Check for an open-circuit. Check for loose
Checking wiring and terminals See: Testing and Inspection/Component Tests and General Diagnostics/Checking Wiring and Terminals
To connect the breakout box, see Connecting the breakout box See: Pinout Values and Diagnostic Parameters/Connecting the Breakout
For information about signals, see Signal specification See: Pinout Values and Diagnostic Parameters/Signal Description/Signal Specification,
See the relevant wiring diagram for information about circuit and ground terminals in the bodywork.
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