| Complaint/Problem |
Possible cause |
Notes |
Test step/Remedy 1) |
| Trip computer control module (N41) not functioning at all |
Voltage supply, trip computer control module (N41) |
|
 23  1.0 |
| Date in display does not function |
If the clock in the instrument cluster (IC) does not function:
Instrument cluster (IC)
otherwise:
N41 |
Synchronization signal for advancing the date comes from the instrument cluster (A1) via CAN data bus |
Instrument cluster (IC) section 1.15
A1
N41 |
| Trip time in display does not function |
N41 |
This function is calculated entirely within the trip computer control module (N41) |
N41 |
Following functions of trip computer not possible:
 momentary fuel consumption
average fuel consumption
range function |
If the speed display in the instrument cluster also does not function:
Traction system control module (N47)
otherwise:
Engine control module (N3/10)
CAN data bus |
The required signals for these function of the trip computer come from the traction systems control module (N47) and from the engine control module (N3/10) via CAN data bus |
DM
AD42.35-P-1001BZ
Read out VSS actual value signal using HHT from instrument cluster (A1) or traction systems control module (N47)
Read out fuel consumption actual value signal using HHT from engine control module (N47)
23 2.0 |
Following functions of trip computer not possible:
momentary fuel consumption
average fuel consumption
or
both functions |
N41 |
|
N41 |
| Only range functions of trip computer not possible |
If the fuel gauge in the instrument cluster also does not function:
Fuel level sensor (M3/3b1)
A1
otherwise:
N41 |
The required signals come from the instrument cluster (A1), traction systems control module (N47) and from the engine control module (N3/10) via CAN data bus |
Instrument cluster (IC) section 1.15
Read out fuel level sensor actual value signal using HHT from instrument cluster (A1) option
N41 |
| "FUEL" flashes in display with trip computer in the range function although, fuel level is above the reserve due to refueling |
If the fuel gauge in the instrument cluster also does not function:
Fuel level sensor (M3/3b1)
A1
otherwise:
N41 |
|
Instrument cluster (IC) section 1.15
Read out fuel level sensor actual value signal using HHT from instrument cluster (A1) option
N41 |
| "FUEL" does not flashes in display with trip computer in the range function although, fuel level is clearly in the reserve range |
If the fuel gauge in the instrument cluster also does not function:
Fuel level sensor (M3/3b1)
A1
otherwise:
N41 |
|
Instrument cluster (IC) section 1.15
Read out fuel level sensor actual value signal using HHT from instrument cluster (A1) option
N41 |
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