Foot brake pedal terminal connection diagrams 
- up to 18.22. (pedal position proportional to voltage)
- => above 18.22. no zero-load switch (brake pressure proportional to voltage)
3-stage foot brake pedal test steps - Open plug connection S2.
Depending on what fault is displayed by the diagnosis, shift brake stage according to the following table and measure resistance between contacts.
If all measurements yield R = RTarget, continue with point 3.
| Brake stage | Measurement between +FB and: | RTarget [Ω] | | 0 | 40 (FB1) | ∞ | | 1 | 40 (FB1) | 0 | | 2 | 40 (FB1) | 0 | | 3 | 40 (FB1) | 0 |
| Brake stage | Measurement between +FB and: | RTarget [Ω] | | 0 | 11 (FB2) | ∞ | | 1 | 11 (FB2) | ∞ | | 2 | 11 (FB2) | 0 | | 3 | 11 (FB2) | 0 |
| Brake stage | Measurement between +FB and: | RTarget [Ω] | | 0 | FB3 | ∞ | | 1 | FB3 | ∞ | | 2 | FB3 | ∞ | | 3 | FB3 | 0 |
- Open S3.
Depending on what fault is displayed by the diagnosis, shift brake stage according to the following table and measure resistance between contacts.
| Brake stage | Measurement between +FB and: | RTarget [Ω] | | 0 | 1 (FB1) | ∞ | | 1 | 1 (FB1) | 0 | | 2 | 1 (FB1) | 0 | | 3 | 1 (FB1) | 0 |
| Brake stage | Measurement between +FB and: | RTarget [Ω] | | 0 | 4 (FB2) | ∞ | | 1 | 4 (FB2) | ∞ | | 2 | 4 (FB2) | 0 | | 3 | 4 (FB2) | 0 |
| Brake stage | Measurement between +FB and: | RTarget [Ω] | | 0 | FB3 | ∞ | | 1 | FB3 | ∞ | | 2 | FB3 | ∞ | | 3 | FB3 | 0 |
- S2: Check resistance of +FB, 11(FB2), 40(FB1) and FB3 to vehicle ground. RTarget = ∞ Ω.
- S3: Check resistance of +FB, 1(FB1), 4(FB2) and FB3 to ground. RTarget = ∞ Ω.
- The signal +FB must continuously supply 24V.
Continuously variable foot brake pedal test steps - Check the voltage values while appying the pedal using menu "D" of DIWAgnosis.
- Open S2 plug connection and check the lines 2 (+FB+HB), 21 (GND) and 49 (VSBG3) for continuity. For a pedal with no-load switch, check also line 40 (VSBG1).
- If the voltage signal in DIWAgnosis was correct and all lines are intact, please contact the vehicle manufacturer and have the brake pedal tested or replaced.
3-stage hand brake lever terminal connection diagram 
3-stage hand brake lever test steps - If the pilot light is defective, replace light bulb.
- Open plug connection S2.
Depending on what fault is displayed by the diagnosis, shift brake stage according to the following table and measure resistance between contacts.
If all measurements yield R = RTarget, continue with point 4.
| Brake stage | Measurement between +HB and: | RTarget [Ω] | | 0 | 7 (HBA) | ∞ | | 1 | 7 (HBA) | 0 | | 2 | 7 (HBA) | 0 | | 3 | 7 (HBA) | 0 |
| Brake stage | Measurement between +HB and: | RTarget [Ω] | | 0 | 26 (HBB) | ∞ | | 1 | 26 (HBB) | ∞ | | 2 | 26 (HBB) | 0 | | 3 | 26 (HBB) | 0 |
| Brake stage | Measurement between +HB and: | RTarget [Ω] | | 0 | 44 (HBC) | ∞ | | 1 | 44 (HBC) | ∞ | | 2 | 44 (HBC) | ∞ | | 3 | 44 (HBC) | 0 |
| Brake stage | Measurement between +HB and: | RTarget [Ω] | | 0 | 21 (-UB) | ∞ | | 1 | 21 (-UB) | approx. 290 | | 2 | 21 (-UB) | approx. 290 | | 3 | 21 (-UB) | approx. 290 |
- Open S8.
Depending on what fault is displayed by the diagnosis, shift brake stage according to the following table and measure resistance between contacts.
| Brake stage | Measurement between +HB and: | RTarget [Ω] | | 0 | 3 (HBA) | ∞ | | 1 | 3 (HBA) | 0 | | 2 | 3 (HBA) | 0 | | 3 | 3 (HBA) | 0 |
| Brake stage | Measurement between +HB and: | RTarget [Ω] | | 0 | 4 (HBB) | ∞ | | 1 | 4 (HBB) | ∞ | | 2 | 4 (HBB) | 0 | | 3 | 4 (HBB) | 0 |
| Brake stage | Measurement between +HB and: | RTarget [Ω] | | 0 | 5 (HBC) | ∞ | | 1 | 5 (HBC) | ∞ | | 2 | 5 (HBC) | ∞ | | 3 | 5 (HBC) | 0 |
| Brake stage | Measurement between +HB and: | RTarget [Ω] | | 0 | Y | ∞ | | 1 | Y | approx. 290 | | 2 | Y | approx. 290 | | 3 | Y | approx. 290 |
- S2: Check resistance of 7(HBA), +HB, 21(-UB), 26(HBB) and 44(HBC) to vehicle ground.
RTarget = ∞ Ω. - The signal +HB must continuously supply 24V.
Notice: variable signal The assignment to a connection of the transmission control unit is accomplished in the data record and is vehicle-specific. |
