Checking The Component

Fig 1: Identifying Ignition OFF

Courtesy of VOLVO CARS CORPORATION

Fig 2: Connecting Battery Negative Lead

Courtesy of VOLVO CARS CORPORATION

Disconnect any connection from the socket for the tow hitch connector
Ignition off, wait for at least 1 minute
Break the power supply to the trailer module (TRM) by disconnecting the battery negative lead. Wait 10 seconds
Connect the battery negative lead.
CAUTION:
Do not touch the terminal pins in the trailer module (TRM). There is a risk of static discharge which could damage the control module.

Download new software and reprogram the trailer module (TRM).

If the fault remains after reprogramming, replace the trailer module (TRM).

Other information
- see SIGNAL SPECIFICATION
- see BATTERY DISCONNECTING AND CONNECTING
- see TRAILER MODULE (TRM)