Mercedes-Benz CS1000 - Manual (Page 92)

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FAULT CODES - 129 Chassis from 9/95
DTC Readout Description
92
421 Auxiliary Fan Control Module (N65/1)
422 Serial Interface Connection (K1) to Instrument Cluster (IC)
423 Switchover Valve Block (15 connection multiplex) (Y11)
459 Serial Interface Connection (K2) to Instrument Cluster (IC)