Diagnostic trouble code (DTC) information REM-8B21

Condition 

Fig 1: Identifying License Plate Lighting Unit

Courtesy of VOLVO CARS OF NORTH AMERICA.

The rear electronic module (REM) powers the license plate lighting directly via an output.

The diagnostic trouble code (DTC) is stored if the rear electronic module (REM) detects a faulty signal.

The diagnostic trouble code (DTC) can be diagnosed at key position II.

Substitute Value 

• 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 ground in the signal cable.

Fault symptom[s] 

• The license plate lighting does not operate.