1997 MERCEDES-BENZ ML320 fuses

Fig. 16: Fuse Assignments Fuse & Relay Box F2
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
RELAY ASSIGNMENTS
Fuse & Relay Box F1 Relay Assignments (Up-To-08/31/01)
For relay locations, see Fig. 3 . For relay assignments, see Fig. 17.

2001 Mercedes-Benz ML320
2001-04 ELECTRICAL Fuses & Circuit Breakers - 163 Chassis
me
Saturday, October 02, 2010 3:22:06 PMPage 27 © 2006 Mitchell Repair Information Company, LLC.

2001 Mercedes-Benz ML320
2001-04 ELECTRICAL Fuses & Circuit Breakers - 163 Chassis
me
Saturday, October 02, 2010 3:22:06 PMPage 28 © 2006 Mitchell Repair Information Company, LLC.

Fig. 17: Relay Assignments Fuse & Relay Box F1
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fuse & Relay Box F1 Relay Assignments (As-Of-09/01/01)
For relay locations, see Fig. 3 . For relay assignments, see Fig. 18.

2001 Mercedes-Benz ML320
2001-04 ELECTRICAL Fuses & Circuit Breakers - 163 Chassis
me
Saturday, October 02, 2010 3:22:06 PMPage 29 © 2006 Mitchell Repair Information Company, LLC.

2001 Mercedes-Benz ML320
2001-04 ELECTRICAL Fuses & Circuit Breakers - 163 Chassis
me
Saturday, October 02, 2010 3:22:06 PMPage 30 © 2006 Mitchell Repair Information Company, LLC.

Fig. 18: Relay Assignments Fuse & Relay Box F1
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Fuse & Relay Box F2 Relay Assignments
For relay locations, see Fig. 15 . For relay assignments, see Fig. 19 .
Fig. 19: Relay Assignments Fuse & Relay Box F2

Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

2001 Mercedes-Benz ML320
2001-04 ELECTRICAL Fuses & Circuit Breakers - 163 Chassis
me
Saturday, October 02, 2010 3:22:06 PMPage 31 © 2006 Mitchell Repair Information Company, LLC.

FUNCTIONAL TEST PREPARATION
1. Check condition of fuses F16, F41, F43 and F44. See WIRING DIAGRAMS . Repair and/or replace
fuses and necessary.
2. Turn ignition on. Locate in-vehicle temperature sensor aspirator blower vent grille above anti-theft
indicator light. Place a half-inch square of tissue paper over aspirator blower vent grille. If paper stays on
vent grille, go to next step. If paper does not stay on vent grille, correct insufficient aspirator blower
ventilation.
3. Put shift lever in "P" and engage parking brake. Run engine at idle until it reaches normal operating
temperature, about 176°F (80°C). Ensure ambient (outside) temperature is greater than 58°F (15°C).
4. Manually open center and side air outlets. Ensure recirculation button is not depressed. Set blower speed
knob to position No. 1.
FUNCTION TEST
Defrost Mode
To check operation in defrost mode, set temperature selector knob to White range (vertical). Set mode control
knob to 12-o'clock position (vertical). Ensure A/C button indicator is illuminated. Air will vent from defrost and
center outlets and A/C compressor will engage. If operation is not as specified, perform the following in order:
Check voltage supply circuit Z50/2 between No. 16 fuse (15-amp) and connected components. See
VOLTAGE SUPPLY CIRCUIT Z50/2
under ELECTRICAL TESTS.
Check ground circuit. See GROUND CIRCUIT Z50/4 under ELECTRICAL TESTS.
Check in-vehicle temperature sensor signal voltage. See IN-VEHICLE TEMPERATURE SENSOR
under ELECTRICAL TESTS.
Check in-vehicle temperature sensor signal resistance. See IN-VEHICLE TEMPERATURE SENSOR
under ELECTRICAL TESTS.
Check icing protection temperature sensor signal voltage. See ICING PROTECTION
TEMPERATURE SENSOR under ELECTRICAL TESTS.
Check icing protection temperature sensor resistance. See ICING PROTECTION TEMPERATURE
SENSOR under ELECTRICAL TESTS.
Check activation voltage during temperature reduction. See ACTIVATION VOLTAGE
TEMPERATURE under ELECTRICAL TESTS.
Check activation voltage during temperature increase. See ACTIVATION VOLTAGE
TEMPERATURE under ELECTRICAL TESTS.
Check blend air flap actuator motor operation voltage. See BLEND AIR FLAP ACTUATOR MOTOR
under ELECTRICAL TESTS.
Check blend air flap actuator motor resistance. See BLEND AIR FLAP ACTUATOR MOTOR under
ELECTRICAL TESTS.
Check A/C button activation. See A/C BUTTON under ELECTRICAL TESTS.
Check A/C pressure switch. See A/C REFRIGERANT PRESSURE SWITCH under ELECTRICAL NOTE: Function test steps must be performed in order given.

2001 Mercedes-Benz ML320
2000-01 MANUAL A/C-HEATER SYSTEMS ML 320, ML 430 & ML 55
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Saturday, October 02, 2010 3:25:10 PMPage 9 © 2006 Mitchell Repair Information Company, LLC.

Fig. 131: Identifying Heater Capacity, Function Check, Heater
HEATER, DIAGNOSIS, FUNCTION CHECK - AD83.20-P-3000GH
MODEL 163
Heater, diagnosis, basic knowledge AD83.20-P-2000GH
Check fuses F1/6, F1/41, F1/43

Allow engine to idle at operating
temperature (approx. 80°C engine coolant
temperature) throughout the entire test
period

Outside temperature > 15°C
Open center and side air outlets manually
Recirculated air button ( ) is not
pressed (LED does not come on)
Blower switch on stage 4
Function check
Test
step/Scope of
test
Operation/Requirement Specified value Possible cause/ Remedy
1
No heat Heater switch on "blue" stopAir outlets,
unheated airWire cable for
actuating blend air
flap

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
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Saturday, October 02, 2010 3:23:17 PMPage 161 © 2006 Mitchell Repair Information Company, LLC.

Fig. 132: Locating In-Car Temperature Sensor With Aspirator Nozzle
1. Check condition of fuses F16, F41, F43, F44.
2. Check aspirator nozzle for in-car temperature sensor as follows: With ignition switched on, place a piece
of paper (arrow) of 1cm surface area on grill in front of in-car temperature sensor with aspirator nozzle
(B10/4). With sufficient ventil ation (aspirator nozzle to blow er), paper remains on grill.
3. Allow engine to idle at operating temperature (engine coolant temperature approx. 80°C) during the
complete duration of the test.
4. Outside temperature > 15°C.
5. Open center and side air outlets manually.
6. Recirculated air switch not pressed.
7. Set blower switch to stage 4.
AIR CONDITIONING (TEMPMATIC ) PRECONDITIONS FOR OPERATIONAL CHECK - AD83.30-P-2000-01GK
as of 1.12.99

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:17 PMPage 163 © 2006 Mitchell Repair Information Company, LLC.