Test Point 1 - Power Supply for DME Control Unit

DME Connector Identification:

TEST POINT 1a - Power supply for Digital Motor Electronics (DME) control unit (V)

Possible Causes, Elimination, Remarks
a) Permanent positive (term. 30) If there is no B+ at term. 30 the fault memory is cleared

Test procedure: Connect a voltmeter to terminal 24 (-) and terminal 18 (+) of the control unit plug with the help of test leads.

Display: Battery voltage

No display: Check current flow and ground paths in accordance with wiring diagram.

TEST POINT 1b - Power supply of DME control unit (V) too high/too low - Fault code 1_11

Possible Causes, Elimination, Remarks
b) Power supply via DME relay

Connect a voltmeter to terminal 24 (-) and terminal 37 (+) of the control unit plug with the help of test leads. Turn on ignition.

Display: Battery voltage

No display: Check current flow according to wiring diagram.

NOTE:
Cars with burglar alarm: Check power supply from ignition lock to terminal 86 of the DME relay via the burglar alarm control unit in accordance with the wiring diagram.
Cars without burglar alarm: Check the plug jumpers on plug section (provided for installation of a burglar alarm control unit).