Mercedes-Benz ML320. Manual — part 694

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 ventilation (aspirator nozzle to blower), 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

Fig. 133: Locating In-Car Temperature Sensor With Aspirator Blower

1. Check status of fuses F16, F41, F43, F44.

2. Check aspirator blower for in-car temperature sensor: With ignition switched on, place a piece of paper

(arrow) of 1cm surface area on grill in front of in-car temperature sensor (B10/4) with aspirator blower.
With sufficient ventilation (aspirator blower to blower), paper remains on grill.

3. Allow engine to idle for entire duration of test at operating temperature (approx. 80°C coolant

temperature).

4. Outside temperature > 15°C

5. Open center and side nozzles manually.

6. Recirculating air switch

not pressed.

7. Blower switch on step 1.

Observe run-on time.

AIR CONDITIONING (TEMPMATIC) VERSION CODING - AD83.30-P-2000-02GH

Variant coding is carried out by the HHT and is menu-assisted. Communication is possible as soon as the
ignition key is inserted in the ignition lock (the ignition lock position is not important). Variant coding (position
1) is reached from the main menu via control module adaptations (position 5). The following two options are
available in variant coding:

1. Read out coding and transfer to new control module.

2. Readout/change coding.

Position 2 must be selected in order to read out the air conditioning coding. The air conditioning variant coding
is found under position 07 in the following listing.

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

Here a selection can be made between:

1. fitted and

2. not fitted

AIR CONDITIONING (TEMPMATIC) NOTES ON FAULT MEMORY - AD83.30-P-2000-03GH

A particular numerical code is assigned to each fault (short-circuit, open-circuit, etc.) which distinguishes
between current faults and faults which occur temporarily.

When determining faults, the push-button control unit (N19) cannot always distinguish between short-circuit
and disconnected cables.

If no fault code is displayed, but there is a complaint, a tolerance deviation of components can exist. Since such
a deviation is not recorded by the fault memory, the appropriate test steps are to be checked with the socket box
and Multimeter.

AIR CONDITIONING (TEMPMATIC) DIAGNOSIS TOOLS - AD83.30-P-2000-04GH

Commercially available tools

AIR CONDITIONING (TEMPMATIC) TEST OF ELECTRICAL SYSTEM TOOLS - AD83.30-P-2000-06GH

Fig. 134: Identifying 35-Pin Socket Box (124 589 00 21 00)

Coding options

Selection

Air conditioning

fitted/not fitted

Number

Designation

WH58.30-Z-1036-13A

Handheld tester (HHT)

651 100 01 99

WH58.30-Z-1037-13A

Test cable (multiplexer)

651 100 40 99

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me

Fig. 135: Identifying Fused Cable (124 589 37 63 00)

Fig. 136: Identifying Test Cable 14-Pin (163 589 01 63 00)

Commercially available tools

AIR CONDITIONING (TEMPMATIC) SOCKET BOX CONNECTION DIAGRAM - AD83.30-P-2000-07GH

Number

Designation

WH58.30-Z-1001-09A

Multimeter

2001 Mercedes-Benz ML320

1998-2005 HVAC Climate Control - 163 Chassis

me