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Checking Audi A6 C5 facelift

On Board Diagnostic (OBD) - HVAC 2 illustrations ~238 words

Checking

Note. The electrical testing on vehicles up to model year 2001 is described with VAG 1526 multi-meter. The electrical testing on these vehicles can also be carried out using the VAS 5051 Vehicle Diagnostic, Testing and Information System. The electrical testing on vehicles from model year 2002 is described with the VAS 5051 Vehicle Diagnostic, Testing and Information System. The electrical testing can also be carried out using VAG 1526 multi-meter, except for several test steps. With model year change 2001 to 2002 the A/C system control will be changed over. For Audi allroad, the changeover of the A/C system is not performed with the model year change 2001 to 2002, instead it is a running change (implementation open, for vehicles with 4.2 Liter engine with start of production).

Test requirement

  1. All fuses OK
  2. Adapter cable VAG 1598/11 and VAG 1598/12 connected to disconnected harness connectors of A/C Control Head -E87-.

Scheme 284

Scheme 284
Scheme 284

Scheme 285

Scheme 285
Scheme 285
  1. Select operating mode "Test instrument" on VAS 5051 Vehicle Diagnostic, Testing and Information System
  2. Select during variable test steps the required test instrument types, by clicking the relevant button on VAS 5051 display.
  3. Adjust on VAG 1526 multi-meter the type of test instrument at variable test steps.

Electrical testing

  1. for vehicles up to model year 2001. See «ELECTRICAL TESTING (VEHICLES UP TO MODEL YEAR 2001)»(ref-196289-S40587953982005100800000) .
  2. for vehicles from model year 2002. See «ELECTRICAL TESTING (VEHICLES FROM MODEL YEAR 2002)»(ref-196289-S01876874932005100800000) .