Part 2

The CAN signal from circuit 15 does not match the signal via the hardware line. ( Signal via hardware line = 0 )








1.1.3.2.1.7. Check power supply at control unit N47-5 (ESP, SPS [PML] and BAS control unit).

Test 1.1.3.2.1.7.1: Test voltage of terminal 87 at control unit N47-5 (ESP, SPS [PML] and BAS control unit).

Test 1.1.3.2.1.7.2: Test of cable for voltage supply

Test 1.1.3.2.1.7.3: Test procedure ground cable

1.1.3.2.1.7.1. Test voltage of terminal 87 at control unit N47-5 (ESP, SPS [PML] and BAS control unit).
Test prerequisite

- Battery voltage is OK.
Test sequence

- Switch off ignition.
- Connect socket box.
- Switch on ignition.

- Measure direct voltage with multimeter between sockets (2.23) 57 and (2.14) 48 of the 126-pole socket box tester.
Specified value

- [11...14 V]
Question

- Is the measurement value OK?


YES
The measurement value is OK.Note

- In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Lines to component N47-5 (ESP, SPS [PML] and BAS control unit)
- N10/1f47 (Fuse 47)
End of test

1.1.3.2.1.7.2. Test of cable for voltage supply
Test prerequisite

- Battery voltage is OK.
Test sequence

- Switch off ignition.
- Connect socket box.
- Switch on ignition.

- Measure direct voltage with multimeter between ground and socket (2.14) 48 of the 126-pole socket box tester.
Specified value

- [11...14 V]
Question

- Is the measurement value OK?


YES
The measurement value is OK.Note

- In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Lines to component N47-5 (ESP, SPS [PML] and BAS control unit)
- N10/1f47 (Fuse 47)
End of test

1.1.3.2.1.7.3. Test procedure ground cable
Test prerequisite

- Battery voltage is OK.
Test sequence

- Switch off ignition.
- Connect socket box.

- WMeasure resistance with multimeter between 9 and (2.23) 57 of the 35-pole socket box tester.
Specified value

- [<1ohms]
Question

- Is the measurement value OK?


YES
The measurement value is OK.Note

- In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Ground cable
- W9 (Ground (at front left headlamp unit))
End of test

1.1.3.2.1.8. Check power supply at control unit N51 (AIRmatic with ADS control module).

Test 1.1.3.2.1.8.1: Test voltage supply of circuit 30.

Test 1.1.3.2.1.8.2: Test voltage supply of circuit 87.

1.1.3.2.1.8.1. Test voltage supply of circuit 30.

Test 1.1.3.2.1.8.1.1: Test voltage of terminal 30 at control unit N51 (AIRmatic with ADS control module).

Test 1.1.3.2.1.8.1.2: Test of cable for voltage supply

Test 1.1.3.2.1.8.1.3: Test procedure ground cable

1.1.3.2.1.8.1.1. Test voltage of terminal 30 at control unit N51 (AIRmatic with ADS control module).
Test prerequisite

- Battery voltage is OK.
Status of the relevant actual values:
- Terminal 30:Warning! Communication with ECU required.
Test sequence

- Switch off ignition.
- Connect socket box.
- Switch on ignition.

- Measure direct voltage with multimeter between sockets (2.21) 55 and (2.47) 81 of the 126-pole socket box tester.
Specified value

- [11...14 V]
Question

- Is the measurement value OK?


YES
The measurement value is OK.Note

- In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
End of test

NO
The actual value is not o.k.Note

- This test did not produce any clear result.
- Select further tests.


1.1.3.2.1.8.1.2. Test of cable for voltage supply
Test prerequisite

- Battery voltage is OK.
Test sequence

- Switch off ignition.
- Connect socket box.
- Switch on ignition.

- Measure direct voltage with multimeter between ground and socket (2.47) 81 of the 126-pole socket box tester.
Specified value

- [11...14 V]
Question

- Is the measurement value OK?


YES
The measurement value is OK.Note

- In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Lines to component N51 (AIRmatic with ADS control module)
- F34f37 (Fuse 37)
End of test

1.1.3.2.1.8.1.3. Test procedure ground cable
Test prerequisite

- Battery voltage is OK.
Test sequence

- Switch off ignition.
- Connect socket box.

- W15/Measure resistance with multimeter between 1 and (2.21) 55 of the 35-pole socket box tester.
Specified value

- [<1ohms]
Question

- Is the measurement value OK?


YES
The measurement value is OK.Note

- In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Ground cable
- W15/1 (Ground (right footwell))
End of test

1.1.3.2.1.8.2. Test voltage supply of circuit 87.

Test 1.1.3.2.1.8.2.1: Test voltage of terminal 87 at control unit N51 (AIRmatic with ADS control module).

Test 1.1.3.2.1.8.2.2: Test of cable for voltage supply

Test 1.1.3.2.1.8.2.3: Test procedure ground cable

1.1.3.2.1.8.2.1. Test voltage of terminal 87 at control unit N51 (AIRmatic with ADS control module).
Test prerequisite

- Battery voltage is OK.
Test sequence

- Switch off ignition.
- Connect socket box.
- Switch on ignition.

- Measure direct voltage with multimeter between sockets (2.21) 55 and (2.43) 77 of the 126-pole socket box tester.
Specified value

- [11...14 V]
Question

- Is the measurement value OK?


YES
The measurement value is OK.Note

- In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
End of test

NO
The actual value is not o.k.Note

- This test did not produce any clear result.
- Select further tests.


1.1.3.2.1.8.2.2. Test of cable for voltage supply
Test prerequisite

- Battery voltage is OK.
Test sequence

- Switch off ignition.
- Connect socket box.
- Switch on ignition.

- Measure direct voltage with multimeter between ground and socket (2.43) 77 of the 126-pole socket box tester.
Specified value

- [11...14 V]
Question

- Is the measurement value OK?


YES
The measurement value is OK.Note

- In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Lines to component N51 (AIRmatic with ADS control module)
- N10/1f45 (Fuse 45)
End of test

1.1.3.2.1.8.2.3. Test procedure ground cable
Test prerequisite

- Battery voltage is OK.
Test sequence

- Switch off ignition.
- Connect socket box.

- W15/Measure resistance with multimeter between 1 and (2.21) 55 of the 35-pole socket box tester.
Specified value

- [<1ohms]
Question

- Is the measurement value OK?


YES
The measurement value is OK.Note

- In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
End of test

NO
The measurement value is not OK.Possible cause and remedy

- Ground cable
- W15/1 (Ground (right footwell))
End of test

1.1.3.2.1.9. Check power supply at control unit N63/1 (DTR control module).
Check power supply at control unit N63/1 (DTR control module).
Test sequence

- Switch off ignition.
- Disconnect coupling 2 at component N63/1 (DTR control module).
- Measure direct voltage with multimeter between sockets (N63/1) 2.8 and (N63/1) 2.4
- Switch on ignition.
Specified value

- [11.0 ... 14.5] V
Question

- Is the value o.k.?













YES
Note

- In the event of stored faults with a high fault frequency count or in the event of customer complaints, check lines and connectors for loose contact and corrosion..
End of test

NO
The measured value is not within the specified value range.Possible cause and remedy

- Cables between component N10/1 (Driver-side SAM control unit with fuse and relay module) and control module N63/1 (DTR control module)5A
- Cable for voltage supply


1.1.3.2.1.10. Check power supply at control unit N71 (Headlamp range adjustment control module).
If the fault code is not current, it may be deleted. In this case, the battery voltage was too low over an extended period.Charge the battery, if necessary.Question:Is there a current undervoltage fault is several control modules?Note:This fault could result in consequential faults. You should therefore process this fault first and then erase the fault memory.

YES
Possible cause and remedy

- Battery voltage too low.Test battery.Charge battery, replace if necessary.
- If fault occurs again:Check alternator.Communication with ECU required
- The quiescent current is too high.Test quiescent current.


NO
Figure legend 1:N71 (Headlamp range adjustment control module)Figure legend 2:N10/1 (Driver-side SAM control unit with fuse and relay module)Test prerequisite

- The relevant actual value is not okay.
- Battery voltage is OK.
- Fuse N10/1f52 (Fuse 52) is OK.
Test sequence

- Switch off ignition.
- Disconnect connector at component N71 (Headlamp range adjustment control module).
- Measure direct voltage with multimeter between sockets (N71) 20 and (N71) 19
- Switch on ignition.
Specified value:Voltage = [11.0...14.5] VQuestion

- Is the measurement value OK?













YES
The measurement value is OK.Figure legend 1:N71 (Headlamp range adjustment control module)Figure legend 2:N10/1 (Driver-side SAM control unit with fuse and relay module)Possible cause or remedy in case of malfunction

- Inspect plug connections N71x1 and (N10/1) I10 for damage, loose contact and corrosion, and repair if necessary.
- N71 (Headlamp range adjustment control module)
End of test













NO
The measurement value is not OK.Figure legend 1:N71 (Headlamp range adjustment control module)Figure legend 2:N10/1 (Driver-side SAM control unit with fuse and relay module)Possible cause and remedy

- Cable (N10/1) I10.3 - (N71) 19 is faulty .
- Cable (N71) 20 - W15/1 (Ground (right footwell)) is faulty .
- N10/1 (Driver-side SAM control unit with fuse and relay module)
End of test