Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI1998A8 SEDAN (4D2) V8-3.7L (AEW)REPAIR AND DIAGNOSISBRAKES AND TRACTION CONTROLANTILOCK BRAKES / TRACTION CONTROL SYSTEMSTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSELECTRICAL TESTINGTERMINAL IDENTIFICATION
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)
Terminal Identification
1998 Audi A8 Sedan (4D2) V8-3.7L (AEW)SECTION Terminal Identification
Terminal identification ABS control module -J104-

1 - 3

4 - 9

10 - 16

17 - 19

20

21 - 29

30 - 34

35 - 39

40 - 48

49

50 - 51

52 -59

60 - 64

65 - 69

70 - 76

77 - 79

80 - 81

82 - 88
Electrical test table
^ The socket designations of the VAG1598 test box are identical to the terminal designations of the ABS control module -J104- in the wiring diagram. Incorrect test procedures can cause damage to the system. Do not make connections between any terminals other than those listed in the table.
Refer to "Electrical Wiring Diagrams
^ The specified values refer to the readings on the multimeter and are not necessarily applicable for other test units.
^ If the measured values do not match the specifications, refer to the corrective actions on the right side of the table.
Refer to "Electrical Wiring Diagrams
^ If the measured values match the specifications, also check wiring for intermittent loose terminals and short circuit to B+ and Ground (GND). This applies especially to sporadic malfunctions.
^ Use the VAG1594 connector kit for checking continuity (bridging leads).
^ If the measured values only differ slightly from the specifications, clean the sockets and harness connectors of the testers and adapter leads (with contact spray G 000 700 04), and repeat the check. Before replacing components, check the wiring and connections again, particularly if the specification calls for a resistance reading of less than 10 Ohms.
1 - 3
4 - 9
10 - 16
17 - 19
20
21 - 29
30 - 34
35 - 39
40 - 48
49
50 - 51
52 -59
60 - 64
65 - 69
70 - 76
77 - 79
80 - 81
82 - 88
Electrical test table
^ The socket designations of the VAG1598 test box are identical to the terminal designations of the ABS control module -J104- in the wiring diagram. Incorrect test procedures can cause damage to the system. Do not make connections between any terminals other than those listed in the table.
Refer to "Electrical Wiring Diagrams
^ The specified values refer to the readings on the multimeter and are not necessarily applicable for other test units.
^ If the measured values do not match the specifications, refer to the corrective actions on the right side of the table.
Refer to "Electrical Wiring Diagrams
^ If the measured values match the specifications, also check wiring for intermittent loose terminals and short circuit to B+ and Ground (GND). This applies especially to sporadic malfunctions.
^ Use the VAG1594 connector kit for checking continuity (bridging leads).
^ If the measured values only differ slightly from the specifications, clean the sockets and harness connectors of the testers and adapter leads (with contact spray G 000 700 04), and repeat the check. Before replacing components, check the wiring and connections again, particularly if the specification calls for a resistance reading of less than 10 Ohms.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.