MERCEDES-BENZ ML350 1997 Complete Repair Manual

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.

2001 Mercedes-Benz ML320
2001-04 STARTING & CHARGING SYSTEMS Generators & Regulators - 163 Chassis
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Saturday, October 02, 2010 3:20:32 PMPage 7 © 2006 Mitchell Repair Information Company, LLC.

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
2001-04 STARTING & CHARGING SYSTEMS Generators & Regulators - 163 Chassis
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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 .

2001 Mercedes-Benz ML320
2001-04 STARTING & CHARGING SYSTEMS Gene rators & Regulators - 163 Chassis
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tester scan tool to OBD-II data link connector, see Fig. 8.

2001 Mercedes-Benz ML320
2001-04 STARTING & CHARGING SYSTEMS Generators & Regulators - 163 Chassis
me
Saturday, October 02, 2010 3:20:32 PMPage 10 © 2006 Mitchell Repair Information Company, LLC.

2001 Mercedes-Benz ML320
2001-04 STARTING & CHARGING SYSTEMS Generators & Regulators - 163 Chassis
me
Saturday, October 02, 2010 3:20:32 PMPage 11 © 2006 Mitchell Repair Information Company, LLC.

Fig. 7: Connecting Hand Held Tester Scan Tool To Mercedes-Benz Data Link Connector
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

2001 Mercedes-Benz ML320
2001-04 STARTING & CHARGING SYSTEMS Generators & Regulators - 163 Chassis
me
Saturday, October 02, 2010 3:20:32 PMPage 12 © 2006 Mitchell Repair Information Company, LLC.

2001 Mercedes-Benz ML320
2001-04 STARTING & CHARGING SYSTEMS Gene rators & Regulators - 163 Chassis
me
Saturday, October 02, 2010 3:20:32 PMPage 13 © 2006 Mitchell Repair Information Company, LLC.

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.

2001 Mercedes-Benz ML320
2001-04 STARTING & CHARGING SYSTEMS Generators & Regulators - 163 Chassis
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Fig. 9: Checking Generator Output (Chassis 163)
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

2001 Mercedes-Benz ML320
2001-04 STARTING & CHARGING SYSTEMS Generators & Regulators - 163 Chassis
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VOLTAGE REGULATOR CONTROL
1. Connect multimeter. See Fig. 10 . Ensure charge indicator light goes out when engine is idling and with
increasing engine speed up to 3000 RPM. Apply load to battery by turning on headlights and noting
reading after 2 minutes.
2. Voltage reading should be 13-14.5 volts. If voltage is not to specification, replace voltage regulator. See
VOLTAGE REGULATOR
under REMOVAL & INSTALLATION. If regulator is okay, replace
generator. See GENERATOR under REMOVAL & INSTALLATION.

2001 Mercedes-Benz ML320
2001-04 STARTING & CHARGING SYSTEMS Generators & Regulators - 163 Chassis
me
Saturday, October 02, 2010 3:20:32 PMPage 16 © 2006 Mitchell Repair Information Company, LLC.