Output Diagnostic Test Mode (DTM) (Function 03)

Output Diagnostic Test Mode (DTM) (function 03)

The Output Diagnostic Test Mode (DTM) is part of the electrical check. The following components are checked via Output DTM:
- Speedometer
- Tachometer
- Coolant temperature gauge
- Fuelgauge
- Liquid crystal (LCD) displays for odometer, multi-function indicator/clock
- Integrated navigation system and control lamp LCD display (if available)
- Oil pressure warning buzzer
- Fuel reserve warning lamp
- Coolant temperature/low coolant indicator warning lamp
- Oil pressure warning lamp
- Twin circuit brake and handbrake system warning lamp
- as well as all warning lamps for vehicle equipment having output DTM capability that are coded into the instrument cluster.

- If a malfunction is determined when performing Output DTM, exchange instrument cluster.
- If no malfunction is determined when performing Output DTM, check wiring and connections to instrument cluster using wiring diagram.

Output Diagnostic Test Mode (DTM), initiating


NOTE:
- Output Diagnostic Test Mode (DTM) cannot be initiated, or will be interrupted if engine is running or vehicle is moving,
- Use the -C- button to exit the test sequence at any time.


- Input address word 17 "Instrument cluster" and then press -> button, until "Select function XX" is shown in display.

Indicated on display (select function):


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -3- to select function 03 "Output Diagnostic Test Mode (DTM)".

Indicated on display


Rapid data transfer Q
03 - Output Diagnostic Test Mode (DTM)


- Press -Q- button to confirm input.

Indicated on display


Rapid data transfer ->
Analog indicator


After pressing the -Q- button, the following instrument functional checks are carried out simultaneously on VDO instrument clusters and sequentially on Motometer instrument clusters:
- Coolant temperature needle moves over complete display range
- Tachometer needle moves over complete display range
- Speedometer needle moves over complete display range
- Fuel gauge needle moves over complete display range

After all instrument display range checks, the following constant values are displayed:
Coolant temperature gauge: 90 °C(190 °F)
Tachometer: 3000 rpm
Speedometer: 100 km/h (65 mph)
Fuel gauge: 1/2


NOTE: A gauge needle sweep that has been started will be interrupted each time the ignition is switched on and off.


- Press -> button.

Indicated on display:


Output Diagnostic Test Mode (DTM) ->
Warning lamp test Combi instrument


Warning lamps for:
- Coolant temperature/low coolant level
- Dual circuit brake and handbrake system
- Oil pressure
- Fuel reserve
are activated and light continuously (includes all warning lamps for vehicle equipment having output DTM capability that are coded into the instrument cluster).

- Press -> button.

Indicated on display:


Output Diagnostic Test Mode (DTM) ->
Seat Belt Warning Light -K19-


- Seat belt warning light -K19- lights.
- Press ->button.

Indicated on display:


Output Diagnostic Test Mode (DTM) ->
Signal


- The oil pressure warning buzzer is activated intermittently.
- Press -> button.

Indicated on display:


Output Diagnostic Test Mode (DTM) ->
Segment test


- All liquid crystal segments in the instrument cluster are activated.
- Press -> button.

Indicated on display


Output Diagnostic Test Mode (DTM) ->
ECT Overheat test


VDO instrument clusters (VDO):
- No display in instrument cluster!
- High coolant temperature cut-out for the A/C clutch is activated approx.5 seconds later.

Motometer instrument clusters (MMO):
- Coolant temperature warning lamp lights and warning tone sounds.
- High coolant temperature cut-out for the A/C clutch is activated approx.5 seconds later.

- Press - button.

Indicated on display for instrument clusters with manufacturer code MMO:


Output Diagnostic Test Mode (DTM) ->
END

Indicated on display for instrument clusters with manufacturer code VDO:


Function is unknown or ->
cannot be carried out at the moment


End Output Diagnostic Test Mode (DTM) for VDO instrument cluster inserts by pressing -> button.

- Press" button.

Indicated on display (select function):


Rapid data transfer HELP
Select function XX


- End output (function 06). End Output (Function 06)