Diagnostic Trouble Code (DTC) Information UEM-0090

Condition 

Fig 1: Identifying Rear View Mirror

Courtesy of VOLVO CARS OF NORTH AMERICA.

The upper electronic module (UEM) checks the power supply to the LED for the PAD lamp (Passenger Airbag Deactivated). The LED is integrated in the rear view mirror.

The diagnostic trouble code (DTC) is stored if the upper electronic module (UEM) registers that the power supply signal to the PAD lamp is too low.

The diagnostic trouble code (DTC) can be diagnosed when the LEDs in the rear view mirror are supplied with power, i. e. when the LEDs in the display satisfy conditions for lighting.

Substitute Value 

• None.

Possible Source 

• Defective upper electronic module (UEM) (internal fault).

Fault symptom[s] 

• The SRS indicator lamp is lit.
• Message in the display.