SEAT Workshop Service and Repair Manuals

Special tools, workshop equipment, testers, measuring instruments and auxiliary items required

• ◆ Fault reader V.A.G 1551 or vehicle system tester V.A.G 1552 with cable V.A.G 1551/3
• ◆ Test box V.A.G 1598/31

• ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
• ◆ Adapter set V.A.G 1594
• ◆ Current flow diagram

Check conditions

• ● → All fuses must be OK.
• ● The battery voltage must be at least 11.5 V.

Test sequence

• ‒ Connect the fault reader V.A.G 1551 (V.A.G 1552). Then switch ignition on and select engine control unit with the "Address word" 01.
  (Connecting fault reader and selecting engine control unit .)

• ‒ Press keys 0 and 8 for the function "Read measured value block" and confirm entry with Q key.

• ‒ Press keys 0, 6 and 6 for "display group 66" and confirm with Q key.

• ‒ Observe value in display zone 2:
  (1st and 2nd digits from right)
      Specification: x x x x x x0 0
• ‒ Depress brake pedal and observe display in display zone 2.
      Specification: x x x x x x 1 1
• ‒ Press the ⇒key.
• ‒ Press keys 0 and 6 for the "End output" function and confirm input with the Q key.
• ‒ Switch off ignition.

If the display does not change:

• ‒ Remove shelf on driver's side:

=> General body repairs, interior; Repair group 68; Removing driver's side shelf

Test sequence

Note:

The brake pedal switch (F47) and brake light switch (F) are together in one housing.

• ‒ Pull 4-pin connector off brake light switch and brake pedal switch.

• ‒ → Measure resistance between contacts 1+4 of the switch.
      Specification
      Brake pedal not depressed: ∞ω
      Brake pedal depressed: Max. 1.5ω
• ‒ Measure resistance between contacts 2+3 of the switch.
      Specification
      Brake pedal not depressed: Max. 1.5ω
      Brake pedal depressed:∞ω

If the specifications are not obtained:

• ‒ Replace the brake light switch (F) and brake pedal switch(F47).

If the specifications are obtained:

• ‒ → Connect multimeter to measure voltage between contact 1 and earth.
      Specification: at least 11.5 V
• ‒ Connect multimeter to measure voltage between contact 2 and earth.
• ‒ Switch on ignition.
      Specification: min. 11.5 V

If the specifications are not obtained:

• ‒ Check wiring between 4-pin connector contact 1 and main fuse and then contact 2 and central electrics using current flow diagram:

=> Current flow diagrams, Electrical fault finding and Fitting locations

If the specifications are obtained:

• ‒ Remove battery.
• ‒ → Connect test box V.A.G 1598/31 to control unit wiring harness. The engine control unit remains disconnected.

• ‒ → Check wiring for open circuit between test box and 4-pin connector for open circuit using current flow diagram.
      Contact 3+socket 55
      Contact 4+socket 56
      Wire resistance: Max. 1.5 ω
• ‒ Additionally check wires for short to one another.
• ‒ Additionally check the wiring for short to battery positive or earth.
• ‒ Interrogate fault memory, if necessary, repair any faults and then erase fault memory => Page 01-16, interrogating and erasing fault memory.
• ‒ Read-out the readiness code=> Page 01-64.