1997 MERCEDES-BENZ ML430 battery

Fig. 409: Identifying Portable CTEL Components
Removal
1Disconnect ground cable
of battery
AR54.10-P-0003A
2Remove radio or
COMAND
3Remove stowage
compartment below radio
4Remove cover from radio
5Remove air conditioning
pushbutton control
module
6Remove overhead control
panel
7Tie antenna lead Tied back in radio
shaft
Install
8Covering fiber optic
cable Do not kink or
stretch D2B fiber optic
cable.
Install caps on fiber
optic cable connector and

2001 Mercedes-Benz ML320
1998-2005 ACCESSORIES & BODY, CAB Electrical System - Body - 163 Chassis
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2001-04 STARTING & CHARGING SYSTEMS
Generators & Regulators - 163 Chassis
IDENTIFICATION
CHASSIS & ENGINE IDENTIFICATION
DESCRIPTION
Bosch generators are available in various amp ratings depending on engine application. Voltage regulators are
transistorized and internal to generator. See GENERATOR APPLICATION
table.
GENERATOR APPLICATION
ADJUSTMENTS
DRIVE BELT ROUTING
For drive belt routing, see Fig. 1 . WARNING:Vehicles are equipped with air bag supplemental restraint system. Before
attempting any repairs involving steering column, instrument panel or
related components, see SERVICE PRECAUTIONS (or AIR BAG SAFETY
PRECAUTIONS) and DISABLING & ACTIVATING AIR BAG SYSTEM in
appropriate AIR BAG RESTRAINT SYSTEMS article.
NOTE: When the battery is disconnected, vehicle computer and memory system may
lose data. Driveability problems may exist until computer systems have
completed a relearn cycle.
Model (Year)ChassisEngine
ML55 AMG (2001-03)163.174113.981
ML320 (2001-02)163.154112.942
ML350 (2003-04)163.157112.970
ML430 (2001)163.172113.942
ML500 (2002-04)163.175113.965
ApplicationAmp Rating
V6115
V8150
NOTE: Vehicles have automatic belt tensioners. No adjustment is necessary.

2001 Mercedes-Benz ML320
2001-04 STARTING & CHARGING SYSTEMS Generators & Regulators - 163 Chassis

2001 Mercedes-Benz ML320
2001-04 STARTING & CHARGING SYSTEMS Generators & Regulators - 163 Chassis
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Saturday, October 02, 2010 3:20:31 PMPage 1 © 2006 Mitchell Repair Information Company, LLC.
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Saturday, October 02, 2010 3:20:35 PMPage 1 © 2006 Mitchell Repair Information Company, LLC.

Fig. 1: Drive Belt Routing
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
TROUBLE SHOOTING
PRELIMINARY INSPECTION
Verify customer complaint by operating system. Visually inspect for obvious signs of mechanical and electrical
damage. Check generator belt tension and condition. Ensure that battery voltage is within specifications. Inspect
for blown fuses and damaged relays.
Verify ground connection integrity between engine, body, battery and generator. Check for damaged wiring
harnesses and/or switches. Check for a broken or partially broken wire inside insulation, which could cause
system malfunction but prove good in a continuity/voltage check with system disconnected. Ensure any
aftermarket electronic equipment is properly installed. If fault is found, repair as necessary. If no fault is found,
check for conditions that might cause an intermittent situation.
SERVICE PRECAUTIONS
BATTERY DISCONNECT/CONNECT
Disconnect Procedures
1. On vehicles not equipped with TELE AID, go to step 5 . Vehicles equipped with TELE AID, switch
TELE AID into service mode by turning ignition ON.
2. Turn ON telephone and enter code "*#4610#" on handset.
3. Confirm that "No Telematics Service" appears on handset with okay.
4. Turn OFF handset.
5. Turn OFF ignition.
6. Open hood and open snap fasteners (1) on dust filter housing. See Fig. 2
.
7. Remove dust filter housing (2) exposing battery.
8. If not using quiescent current retention unit, go to step 14 . If using quiescent current retention unit, go to
next step.
9. Connect quiescent current retention unit by switching on quiescent current retention unit (7) and then first
connecting positive terminal (8) and negative terminal (9) of retention unit to positive cable and battery
ground (W10). See Fig. 3
.
10. On vehicles equipped with TELE AID, remove luggage compartment cargo anchoring lugs and remove
floor paneling.
11. Remove screws (1). See Fig. 4
.
12. Dismantle cover from TELE AID control module (A35/8).
13. Disconnect connection coupling for back up battery and remove back up battery.
14. Disconnect ne
gative battery cable (1) and insulate terminal. See Fig. 5. NOTE: Numbers and letters in text refer to numbers and letters in figures.

2001 Mercedes-Benz ML320
2001-04 STARTING & CHARGING SYSTEMS Generators & Regulators - 163 Chassis
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Saturday, October 02, 2010 3:20:31 PMPage 3 © 2006 Mitchell Repair Information Company, LLC.

Fig. 4: Removing Emergency Call System Battery
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 6 © 2006 Mitchell Repair Information Company, LLC.

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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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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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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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.