audi Workshop Repair Guides

Audi Workshop Service and Repair Manuals

Component Locations, Overview|Page 5583 > < Component Locations, Overview|Page 5581
Page 4
background image

-

Connect multimeter between terminals 1 and 2 to measure resistance.
-

Specified value: Infinity Ohms (no continuity)

-

Press brake pedal.
-

Specified value: approx. 0 Ohms

-

Connect multimeter between terminals 3 and 4 to measure resistance.
-

Specified value: approx. 0 Ohms

-

Press brake pedal.
-

Specified value: Infinity Ohms (no continuity)

If the specified values are not obtained:

-

Replace brake light/brake pedal switch.

If specifications are obtained:

Checking power supply

-

Connect voltage tester VAG 1527 B as follows:

Connector

Measure to

terminal

1

Car body Ground point

-

LED should illuminate.

Connector

Measure to

terminal

3

Car body Ground point

-

Switch ignition on.
-

LED should illuminate.

If the LED does not illuminate:

-

Check wiring for open circuit and service if necessary.

If the LED illuminates:

Checking activation

-

Connect test box VAG 1598/31 to wiring harness for engine control module; do not connect engine control module. See: Testing and
Inspection/Scan Tool Testing and Procedures/Scan Tool Testing/Scan Tool Connecting and Initial Checks/Wiring and Component Testing Using

Component Locations, Overview|Page 5583 > < Component Locations, Overview|Page 5581