Diagnostic trouble code (DTC) informationREM-1F8C

Condition 

The Rear electronic module (REM) checks the voltage supply to the fog lamp via the trailer connector.

The diagnostic trouble code (DTC) is stored if the control module detects that the output has a short-circuit to supply voltage or if the driver stage has a too high a temperature.

The diagnostic trouble code (DTC) can be diagnosed in ignition positions I or II.

Fig 1: Identifying Rear Electronic Module (REM)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Substitute Value 

• The control module deactivates the output.
• If the fault has been detected in 100 ignition cycles, the output is closed permanently until the diagnostic trouble code is erased (applies from structure week 200539).

Possible Source 

• Short-circuit to supply voltage in the signal cable.
• Internal fault in Rear electronic module (REM).

Fault symptom[s] 

• Rear fog lamps lit constantly
• Rear fog lamp not working