Diagnostic trouble code (DTC) information

Condition 

Diagnostic trouble code (DTC) CEM-1A21 is stored if the central electronic module (CEM) registers a short-circuit to supply voltage in the relay driver for relay 2/29 for extended X-supply.

Substitute Value 

None

Possible Source 

• Incorrectly installed relay.
• Contact resistance in relay terminals.

Fault symptom[s] 

• Power seat does not operate at all.
• No gauges working.
• The instrument lighting does not operate.