Checking components and wiring

Check the signal cable (carphone mute). Check between accessory control module terminal #B12 and the radio connector. Check for a short-circuit to supply voltage. Check for an open-circuit.

Remedy as necessary.

Other information: 

• To connect the breakout box, see Connecting the breakout box. Accessory electronic module
• To access or replace the Accessory Electronic Module (AEM) and connector, see Replacing the accessory electronic module
• For information about signals, see Signal description. Accessory electronic module (AEM)
• To fault-trace wiring and terminals see Contents

Fig 1: Identifying Accessory Electronic Module Ground Terminals

Courtesy of VOLVO CARS OF NORTH AMERICA.

Fig 2: Identifying Ohmmeter

Courtesy of VOLVO CARS OF NORTH AMERICA.

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  Refer to Verification