SEAT Workshop Service and Repair Manuals > Leon Mk1 > Power unit | 4-Cyl. Injection Engine (2 valves, roller rocket finger), Mechanics | Mixture preparation system, electronic inj.,Gas | Checking additional signals | Checking signal from brake light switch and brake pedal switch

Checking signal from brake light switch and brake pedal switch

Special tools and workshop equipment required

t	Hand multimeter -V.A.G 1526- or multimeter -V.A.G 1715-

t	Adapter set -V.A.G 1594-

t	Test box -V.A.G 1598/22-

t	Current flow diagram

Check conditions

l	All fuses must be OK.

l	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

If the specification is obtained:

–	Remove wiper arms and cowl panel: → Electrical system; Rep. Gr.92

–	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.

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