Checking brake light switchF and brake pedal switch F47 — AUDI

🧭 Before you start

Fits: platform codes 70A, 70B, 70C, 70E, 70H, 70J, 70K, 70L, 70M, 7DA, 7DB, 7DC, 7DE, 7DH, 7DJ, 7DK, 7DL, 7DM

• Renewed: brake light switchf
• Also covered elsewhere: Overview of fitting locations, Page

Don't miss

• Connect fault readerV.A.G 1551 and select engine electronics control unit with "“address word 01”". The ignition must be switched on for this purpose.
• If necessary, left headlight may have to be released and placed to side to connect test boxV.A.G 1598/31Electrical system; Rep. Gr. 94; Lights, bulbs, switches - exterior.

🔧 Engine codes this applies to

📐 20 workshop diagrams for ACV

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Connect fault readerV.A.G 1551 and select engine electronics control unit with "“address word 01”". The ignition must be switched on for this purpose.
2. Press keys 0 and 8 for function "“Read measured value block”" and confirm entry with Q key.
3. Press keys 0, 0 and 6 for "“Display group number 6”" and confirm entry with Q key.
4. Observe display in display zone 2.
5. Operate brake pedal slowly.

6. Release brake pedal slowly into rest position again.
7. Press → key.
8. Press keys 0 and 6 for function "“End data transfer”" and confirm entry with Q key.
9. Switch off ignition.
10. Pull 4-pin connector from brake light switchF and brake pedal switch F47 ⇒ Overview of fitting locations, Page .
11. Connect hand-held multimeterV.A.G 1526C to measure resistance between contacts 1 and 4. Specification: ∞ Ω (no continuity).
12. Depress the brake pedal. Specification: approx. 0 Ω
13. Connect hand-held multimeterV.A.G 1526C to measure resistance between contacts 2 and 3. Specification: approx. 0 Ω
14. Depress the brake pedal. Specification: ∞ Ω (no continuity).
15. Renew brake light switchF and brake pedal switch F47.
16. Connect hand-held multimeterV.A.G 1526C to measure resistance between contact 1 and earth. Specification: at least 11.5 V
17. Switch on ignition.
18. Connect hand-held multimeterV.A.G 1526C to measure resistance between contact 2 and earth. Specification: at least 11.5 V
19. Check line between 4-pin connector contact 1 and 2 and central electrics using current flow diagram.
20. Connect test boxV.A.G 1598/31 to control unit wiring harness. [Note: If necessary, left headlight may have to be released and placed to side to connect test boxV.A.G 1598/31Electrical system; Rep. Gr. 94; Lights, bulbs, switches - exterior.]
21. Check lines between test boxV.A.G 1598/31 and 4-pin connector for open circuit using current flow diagram. Contact 3+socket 65 Contact 4+socket 32 Line resistance: Max. 1.5 Ω
22. Additionally check lines for short circuit to one another.
23. Additionally check lines for short circuit to battery positive or earth.

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