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Using Analog Voltmeter

Use Diagnostic Trouble Code Check Harness (MB991529) if available. Connect analog voltmeter between 16-pin Data Link Connector (DLC) ground terminal No. 4 or 5 and ETACS ECU terminal No. 9. See Fig 1 . Perform required operation to check input. If input signal is sent to DLC, voltmeter needle will move once. See INPUT SIGNAL VERIFICATION  table.

Fig 1: Identifying Data Link Connector (DLC) Terminals
G99E08121Courtesy of DAIMLERCHRYSLER CORP.
INPUT SIGNAL VERIFICATION

Input Signal Condition To Activate Input Signal Improper Response Go To Test No.
Ignition Switch (ACC) Turn From LOCK To ACC 1 
Ignition Switch (Ign 1) Turn From ACC To ON 2 
Key Reminder Switch Remove Ignition Key From Ignition Switch 3 
Hazard Warning Light Switch Turn From Off To On 4 
Foglight Switch Turn From Off To On 5 
Washer Fluid Level Switch Washer Fluid Level Is Lower Than Washer Fluid Level Switch Plunger 6 
Driver's Seat Belt Switch Turn Ignition On & Remove Driver's Seat Belt From Seat Belt Buckle 7 
Driver/Passenger Door Switch Open Driver's Or Passenger's Door 8 
Door Switches Open Any Door When All Doors Are Closed 8 
Driver/Passenger Door Key Switch Turn Door Key To Lock Or Unlock Position 9 
Driver/Passenger Manual Door Lock Knob Switch Manually Lock Or Unlock Door Using Door Lock Knob 10 
Door Lock Switch Lock Or Unlock Doors Using Switch 11 
Trunk Lid Latch Open Trunk Lid 12 
Trunk Lid Key Switch Turn Trunk Key To Unlock Position 13 
Speed Sensor Vehicle Speed Changes 15 MPH Or Greater Within A 2 Second Period 14 
Taillight Switch Turn Headlight Switch From Off To Exterior Lights Position 15 
Headlight Switch Turn Headlight Switch From Exterior Lights To Headlight Position 15 
Passing Light Switch Activate Passing Lights On Using Headlight Switch 15 
Dimmer Switch Activate High Beams On & Off Using Headlight Switch 15 
Turn Signal Switch Activate Left & Right Turn Signals 15 
Windshield Wiper Mist Switch Operate Wipers To Mist Position 16 
Windshield Wiper Intermittent Switch Operate Wipers To Intermittent Position 16 
Windshield Wiper Low Speed Switch Operate Wipers To Low Speed Position 16 
Windshield Wiper High Speed Switch Operate Wipers To High Speed Position 16 
Windshield Wiper Intermittent Adjustment Switch (1) Operate Wipers To Intermittent Position & Rotate Knob 17 
Windshield Washer Switch Operate On & Off 17 
RKE Transmitter Lock, Unlock & Panic Switches (2) Operate All Buttons 18 
Sun Roof Switch (3) Operate To Open, Close & Tilt Positions 19 
(1) Tone will sound or needle will fluctuate around middle position.
(2) On vehicles with remote keyless entry system.
(3) On vehicles with sun roof.
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