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HOMESERVICE MANUALSAUDI2004A4 BASE, 4D SEDAN, 3.0 TREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTHEATED GLASS/DEFOGGERSON BOARD DIAGNOSTIC (OBD)AUTOMATIC CLIMATE CONTROL SYSTEM, ELECTRICAL TESTINGCOMPONENTS ACTIVATED BY A/C CONTROL HEAD -E87-, ELECTRICAL TESTINGPROCEDURE
2004 Audi A4 Base, 4D Sedan, 3.0 T

Components activated by A/C control head -E87-, electrical testing: Procedure

2004 Audi A4 Base, 4D Sedan, 3.0 TSECTION Procedure
  • Switch ignition off.
  • Remove A/C Control Head -E87-. See A/C CONTROL HEAD -E87-, REMOVING AND INSTALLING .
  • Disconnect connectors -D- and -F- from A/C control head -E87-
  • Connect adapter cable VAG 1598/12 of test box to disconnected harness connector -D-.
    • Fig 1: Identifying Connectors Of A/C Control Head
    G02752033Courtesy of AUDI OF AMERICA, INC.
  • Connect VAG 1598 A test box to VAG 1598/12 adapter cable
  • Measure voltage between terminal 5 of connector -F- and socket 13 (Ground connection) of test box.
    • Specification: approx. battery voltage
  • Measure resistance between terminal 6 of connector -F- and socket 13 (Ground connection) of test box.
    • Specification: Resistance approx. 0.5 to 1.0 Ξ©(Ohm)
    NOTE:
    • Resistances value smaller than 10Ξ©. cannot be measured accurately with shop tools, a short circuit in the wiring connection or in the Heated Rear Window -Z1- cannot be detected
    • If the resistance value is too large, check and eliminate open circuit in wiring connection to Heated Rear Window -Z1-.

    See appropriate System Wiring Diagrams article

    • Fig 2: Identifying Connectors Of A/C Control Head
    G02752034Courtesy of AUDI OF AMERICA, INC.
  • Connect harness connectors -D- and -F- to A/C control head -E87- (all connectors are now connected to the -E87-).
  • Guide wire of connector -F- terminal "6" through current clamp 50 A of VAS 5051/9.
  • Select operating mode "Test instrument" on VAS 5051: Current 50 A current clamp on.
    Fig 3: Identifying Connectors Of A/C Control Head
    G02752035Courtesy of AUDI OF AMERICA, INC.
RENDER: 1.0x

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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.