Test 1.1.3.2.1: Voltage supply of engine compartment CAN control modules
Test 1.1.3.2.2: Resistance test of engine compartment CAN
1.1.3.2.1. Voltage supply of engine compartment CAN control modules
Test 1.1.3.2.1.1: Check power supply at control unit N71 (Headlamp range adjustment control module).
Test 1.1.3.2.1.2: Check power supply at control unit N73 (EIS [EZS] control unit).
Test 1.1.3.2.1.3: Check power supply at control unit N80 (Steering column module).
Test 1.1.3.2.1.4: Check power supply at control unit A1 (Instrument cluster).
Test 1.1.3.2.1.5: Check power supply at control unit A89 (DTR controller unit).
Test 1.1.3.2.1.6: Check power supply at control unit N3/10 (ME-SFI [ME] control unit).
Test 1.1.3.2.1.7: Check power supply at control unit N15/3 (ETC [EGS] control unit).
Test 1.1.3.2.1.8: Check power supply at control unit N15/5 (Electronic selector lever module control unit).
Test 1.1.3.2.1.9: Check power supply at control unit N15/6 (Sprintshift control module).
Test 1.1.3.2.1.10: Check power supply at control unit N47-5 (ESP, SPS [PML] and BAS control unit).
Test 1.1.3.2.1.11: Check power supply at control unit N51 (AIRmatic with ADS control module).
Test 1.1.3.2.1.12: Check power supply at control unit N63/1 (DTR control module).
Test 1.1.3.2.1.13: Check power supply at control unit Y3/8n4 (Fully integrated transmission control (VGS) control unit).
1.1.3.2.1.1. 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?
