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DIY DB25 connector for VGS4-0-NAG2 (Type 1): TCU pinout to AVDI

Mercedes Interface New Hardware / Connections Advanced ⏱ 30-60 min 8 steps

Wiring diagram for building your own DB25 connector to hook up to the AVDI (and to the ABProg ZN030) when you work on a VGS4-0 NAG2 Type 1 transmission control unit on the bench and you don't have the CB088 cable.

Required licences

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Hardware / cables

⚠ WarningUse insulated wire only and stick to the specification given for each connection. A 13.6 V supply is required.

Procedure

  1. Get hold of a male DB25 connector and insulated wire of adequate gauge; the DB25 goes to the ABProg ZN030 programmer / to the AVDI.
  2. Connect PIN 1 of the TCU connector (CAN H) to PIN 7 of the DB25 going to the AVDI.
  3. Connect PIN 2 of the TCU connector (CAN L) to PIN 15 of the DB25 going to the AVDI.
  4. Connect PIN 4 of the TCU connector (12V+) to PIN 17 of the DB25 going to the AVDI.
  5. Connect PIN 5 of the TCU connector (GND) to PIN 5 of the DB25 going to the AVDI.
  6. Fit a 120 Ohm resistor between CAN H and CAN L.
  7. Power the bench setup from a 13.6 V power supply.
  8. As an alternative to the DIY DB25 you can use the CB088 cable or the dedicated cable from the CB011 set, following the same wiring diagram.

Reference screenshots

DIY DB25 connector for VGS4-0-NAG2 (Type 1): TCU pinout to AVDI — 1DIY DB25 connector for VGS4-0-NAG2 (Type 1): TCU pinout to AVDI — 2
Source: Manuale Mercedes FBS4 Manager, parte 2 di 2, cap. 5.1.3 - DIY DB25 (p.45-46) · ⏱ estimated time 30-60 min
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