A8 Quattro Sedan V8-4.2L (AUX) (2001)
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Disconnect 4-pin harness connector on brake pedal.
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Connect hand-held multimeter (voltage range) between the following sockets on the connector:
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Switch ignition off.
4-pin connector on wiring harness, socket
Specification
1 + Ground (GND)
Battery voltage
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Switch ignition on.
4-pin connector on wiring harness, socket
Specification
3 + Ground (GND)
Battery voltage
If specifications are met:
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Check wiring connections.
If specifications are not met:
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Check wiring connections from sockets 1 and 3 of connector for open circuit or short to Ground (GND).
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Repair any open/short circuit as necessary.
Checking wiring connections
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Connect VAG1598/31 test box to wiring harness for engine control module. Do not connect to the engine control module itself. Refer to "Scan
Tool Testing/Scan Tool Connecting and Initial Checks/Connecting VAG1598/31 Test Box" under "Powertrain Management" See: Testing and
Inspection
Test the following wiring connections for open circuits and short to B+ or Ground (GND):
4-pin connector on wiring
VAG1598/31 test box,
harness, socket
socket
2
56
4
55
Resistance in wiring: max. 1.5 ohm
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Repair any open/short circuit as necessary. If no open circuit is identified in the wiring:
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Replace brake light switch/brake pedal switch.
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Display readiness code. The readiness code must be generated if the DTC memory was erased.
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Readiness Code" under "Powertrain Management" See: Testing and Inspection
Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code" under "Powertrain Management" See: Testing and
Inspection