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Fig. 5: Disconnecting Ground Lead From Battery 
Courtesy of MERCEDES-BENZ OF NORTH AMERICA. 
Connect Procedures 
1. To install, reverse removal procedure. Install new back up battery for TELE AID. Switch OFF service 
mode in emergency call system by turning ignition on. Confirm "Leave Service Mode" with okay on 
handset and then confirm "No Telematic Service" with okay. If removed, tighten luggage compartment 
cargo anchoring lugs to 15 ft. lbs. (20 N.m).  
2. If a quiescent current retention unit was not used, perform basic programming. See BASIC 
PROGRAMMING . After repairs using appropriate scan tool retrieve and erase any DTCs from 
memory. See RETRIEVING & ERASING DIAGNOSTIC TROUBLE CODES
 .  
BASIC PROGRAMMING 
1. Set time on instrument cluster. See SETTING TIME .  
2. If equipped, set time on auxiliary or stationary heater. 
 
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3. Normalize side power windows. See NORMALIZING POWER WINDOWS .  
4. Start engine and run at idle. Turn steering wheel from one lock position to the other to activate steering 
angle sensor. Center steering wheel. Message "EI. STAB. PROGRAM GO TO GARAGE" should erase 
from multifunction display panel.  
5. If equipped, normalize tilting/sliding roof. See NORMALIZING TILTING/SLIDING ROOF
 .  
6. If equipped, normalize memory power seats, steering column and outside mirror if components are 
installed. See NORMALIZING MEMORY POWER SEATS, STEERING COLUMN & OUTSIDE 
MIRROR .  
Normalizing Power Windows 
1. Completely close each window with manual switch. Hold switch in closed position for .3 second.  
2. Repeat procedure for each power window.  
Normalizing Memory Power Seats, Steering Column & Outside Mirror 
1. Using manual switch, move seat to each end position and hold for .3 second. Repeat procedure for each 
switch except rear stop of backrest.  
2. Repeat procedure for end positions of steering wheel and outside mirrors.  
Normalizing Tilting/Sliding Roof 
Open roof with SR switch until mechanical stop is reached. Continue to press switch for .5 seconds. 
Setting Time 
1. Use bottom left button on steering wheel to scroll through menus on instrument cluster to "Settings" 
menu.  
2. Move selection marker with + or - button to "Time" submenu.  
3. Press up or down arrows to "Clock, hours" setting. Confirm selection marker is on the hour setting.  
4. Press + or - to set hour. Press reset knob in instrument cluster to confirm.  
5. Move selection marker with + or - button to "Time" submenu.  
6. Press up or down arrows to "Clock, minutes" setting. Confirm selection marker is on the minutes setting.  
7. Press + or - to set minute. Press reset knob in instrument cluster to confirm.  
TESTING 
If generator malfunctions, check for Diagnostic Trouble Codes (DTCs) in Motor Electronics Sequential Fuel 
Injection (ME-SFI) system. See appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If 
cause of generator malfunction is not engine performance related, replace generator. 
RETRIEVING & ERASING DIAGNOSTIC TROUBLE CODES 
NOTE: Before replacing any component that scan tool suggests are faulty, ensure that 
all wiring connections and harness connectors are okay. Ensure that power and 
 
2001 Mercedes-Benz ML320 
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RETRIEVING DIAGNOSTIC TROUBLE CODES 
To retrieve codes using hand held tester, see  Fig. 6 .  
Fig. 6: Retrieving Codes Using Hand Held Tester
  
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.   
CLEARING DIAGNOSTIC TROUBLE CODES 
Disconnecting vehicle battery will not erase codes. Follow scan tool equipment manufacturers instructions to  
erase fault codes. 
FAULT CODE DIAGNOSIS EQUIPMENT CONNECTION 
To connect hand held tester scan tool   to Mercedes-Benz data link connector, see  Fig. 7 . To connect hand held  
ground circuits are functioning properl 
y. For circuit identification, see  
appropriate WIRING DIAGRAM unde  r ENGINE PERFORMANCE in SYSTEM  
WIRING DIAGRAMS for   vehicle being tested. 
NOTE: For diagnostic equipment conn  ections, see FAULT CODE DIAGNOSIS 
EQUIPMENT CONNECTION .
 
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tester scan tool to OBD-II data link connector, see Fig. 8.
 
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2001 Mercedes-Benz ML320 
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Fig. 7: Connecting Hand Held Tester Scan Tool To Mercedes-Benz Data Link Connector 
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
 
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2001 Mercedes-Benz ML320 
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Fig. 8: Connecting Hand Held Tester Scan Tool To OBD-II Data Link Connector 
Courtesy of MERCEDES-BENZ OF NORTH AMERICA. 
ON-VEHICLE TESTING 
WIRING CONTINUITY 
1. Connect voltmeter between generator B+ terminal and ground. Voltmeter should indicate battery voltage. 
If battery voltage is not indicated, check battery and check wiring between generator and battery for 
corrosion, loose terminals, etc.  
2. Turn ignition on and ensure instrument cluster charge indicator light (battery symbol) comes on. If light 
does not come on, check wiring between generator and warning light, including indicator bulb.  
GENERATOR OUTPUT 
1. Ensure connections at battery and generator are clean and tight. Ensure generator, engine and body are 
properly grounded. Ensure generator drive belt is properly adjusted and in good condition.  
2. Connect load tester/ammeter as per tester manufacturer's instructions. Connect voltmeter leads to battery 
terminals. See Fig. 9
 . Start engine and run at 2200 RPM for V6 or 2500 RPM for V8. Adjust load tester 
to obtain maximum generator output. DO NOT allow voltage to drop to less than 12.7 volts.  
3. Maximum generator output should be within a few amps of generator rated output stamped on generator. 
If output is not within a few amps of generator rated output, check generator diodes. See DIODE TEST
 . 
Replace 
generator as necessary. 
 
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