CEM-1A21

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.