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Removing and installing all-wheel drive control unit J492 > < Electrical and electronic components and their locations

Golf Mk4

Overview of electrical and electronic components and their locations
   
Overview of electrical and electronic components and their locations
1 - All-wheel drive control unit -J492-
q   Location → Fig.
q   Forms a unit together with oil pressure control motor -V184- and hydraulic temperature sender -G271-.
q   Overview - control units → Anchor.
q   Removing and installing → Chapter
2 - Engine control unit
q   Location → Fig.
q   The following signals are transmitted to the four-wheel drive control unit -J492- via the data bus:
q   Engine speed
q   Accelerator pedal position
q   Engine torque
q   Removing and installing → Rep. Gr.23 or → Rep. Gr.24
3 - ABS control unit -J104-
q   Location: on hydraulic unit, on left in engine compartment
q   The following signals are transmitted to the four-wheel drive control unit -J492- via the data bus:
q   Rotational speeds of wheels
q   Longitudinal acceleration
q   Brake actuation
q   Removing and installing → Brake system; Rep. Gr.45
4 - Haldex coupling pump -V181-
q   Location → Fig.
q   Can be checked using “guided fault finding” of -VAS 5051-
q   Removing and installing → Chapter
5 - Diagnostic connection
q   Location: in centre console below operating control unit for heating and air conditioning.
6 - Brake light switch -F-
q   Location: on brake pedal
q   Can be checked using “guided fault finding” of -VAS 5051-
q   Removing and installing → Brake systems; Rep. Gr.46.
7 - Handbrake warning switch -F9-
q   Location → Fig.
q   Can be checked using “guided fault finding” of -VAS 5051-
q   Removing and installing → Brake systems; Rep. Gr.46

   
All-wheel drive control unit -J492-
Location: control unit -arrow- is located on right front of rear final drive.
Removing and installing → Chapter
Overview - control units
One must differentiate between two types of four-wheel drive control unit -J492-:
t  To end of 04.99 not all control units are capable of diagnosis. In the event of customer complaints concerning these vehicles, a complete electrical test must be carried out → Chapter.
t  From 05.99 all control units are capable of diagnosis. This new control unit generation can be identified only by the part number of the control unit. In case of complaints, perform “guided fault finding” with -VAS 5051-.
Allocation of control unit → ETKA (electronic parts catalogue)
  N01-0239
Haldex coupling pump -V181-
Location: Haldex coupling pump -arrow- is located on right front of rear final drive below control unit.
Removing and installing → Chapter
  N01-0238
Engine control unit
Location: control unit is located in plenum chamber.
Removing and installing control unit:
→ Rep. Gr.23
→ Rep. Gr.24
  N01-0138
Handbrake warning switch -F9-
Location: switch -arrow- is located on hand brake lever.
Removing and installing handbrake warning switch
→ Brake systems; Rep. Gr.46.
  N01-0426

Removing and installing all-wheel drive control unit J492 > < Electrical and electronic components and their locations