Pull out servotronic control unit -J236-, position 2.
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If voltage supply, servotronic solenoid valve and road speed display on speedometer are all OK, check electrical wiring between servotronic control unit -J236-, contact 4, and control unit in dash panel insert -J285- → Current flow diagrams, Electrical fault finding and Fitting locations.
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If electrical wiring between contact 4 and control unit in dash panel insert -J285- is OK, renew servotronic control unit -J236-.