Volkswagen Workshop Service and Repair Manuals

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

• ◆ Hand multimeter V.A.G 1526 or multimeter V.A.G 1715
• ◆ Adapter set V.A.G 1594
• ◆ Test box V.A.G 1598/22
• ◆ Current flow diagram

Check conditions

• ● → Fuses No. 15 and 24 must be OK.
• ● The battery voltage must be at least 11.5 V.

Test sequence

Note:

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

• ‒ Pull the connector off brake light/brake pedal switch.

• ‒ → Connect the multimeter to measure resistance between contacts 1 and 4.
       Specification: ∞ ω (no continuity)
• ‒ Depress brake pedal.
       Specification: approx. 0 ω
• ‒ Connect the multimeter to measure resistance between contacts 2 and 3.
       Specification: approx. 0 ω
• ‒ Depress the brake pedal.
       Specification: ∞ ω (no continuity)

If the specifications are not attained:

• ‒ Replace the brake light/brake pedal switch.

If the specifications are obtained:

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

If the specifications are not obtained:

• ‒ Check the wire between 4-pin connector contact 1 and main fuse/contact 2 and central electrics using current flow diagram.

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

If the specification is obtained:

• ‒ Remove wiper arms and cowl panel:

=> Electrical system; Repair group 92; windscreen wiper system; removing and installing windscreen wiper system

• ‒ → Connect test box V.A.G 1598/22 to control unit wiring harness.

• ‒ → Check wiring for open circuit between test box and 4-pin connector using current flow diagram.
       Contact 3+socket 51
       Contact 4+socket 23
       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.