Reverse Warning System (Does Not Apply To S80 2004-)

Fig 1: Reverse Warning System Control Module And Sensor

Courtesy of VOLVO CARS OF NORTH AMERICA.

The reverse warning system consists of a control module and four sensors. The control module is installed in the cargo compartment of the car behind the right side panel.

The reverse warning system's control module is directly connected to control module accessory electronics (AEM). Communication between the reverse warning system's control module and accessory electronic module (AEM) consists of a 0V/12V pulsating signal, which comes at more frequent intervals in case of reduced distance to an object.

The reverse warning system's control module is supplied with voltage and connected to ground via the accessory electronic module (AEM).

The four sensors are installed in the rear bumper of the car. The sensors function as transmitters and receivers.

The sensors transmit ultrasound which it then measures time by.

The signal is sent to the accessory electronic module (AEM) as a digital pulse.

There are two versions of the reverse warning system (accessory):

• One for early versions, which is not  connected to the car's CAN-net. This version does not use accessory electronic module (AEM).
• One for late versions, which is connected to the car's CAN-net via accessory electronic module (AEM).

The difference between the early and late versions can be seen from the chassis number in the table below.

(1) applies to cars manufactured in production plant 1.

(2) applies to cars manufactured in production plant 2.

Information regarding which production plant a car is manufactured in can be found in the VIN number. The seventh position from the right in the VIN specifies the production plant.

Control module audio (AUM) is required for the reverse warning system to function.

When post-installing the reverse warning system the car must be configured using new software which is carried out via VIDA.

There are diagnostics for the reverse warning system.